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| SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs Rev. 4 -- 8 June 2010 Product data sheet 1. General description The SC16C554B/554DB is a 4-channel Universal Asynchronous Receiver and Transmitter (QUART) used for serial data communications. Its principal function is to convert parallel data into serial data and vice versa. The UART can handle serial data rates up to 5 Mbit/s. It comes with an Intel (16 mode) or Motorola (68 mode) interface. The SC16C554B/554DB is pin compatible with the ST16C554 and TL16C554 and it will power-up to be functionally equivalent to the 16C454. Programming of control registers enables the added features of the SC16C554B/554DB. Some of these added features are the 16-byte receive and transmit FIFOs, four receive trigger levels. The SC16C554B/554DB also provides DMA mode data transfers through FIFO trigger levels and the TXRDY and RXRDY signals. (TXRDY and RXRDY signals are not available in the HVQFN48 package.) On-board status registers provide the user with error indications, operational status, and modem interface control. System interrupts may be tailored to meet user requirements. An internal loopback capability allows on-board diagnostics. The SC16C554B/554DB operates at 5 V, 3.3 V and 2.5 V, and the industrial temperature range, and is available in plastic PLCC68, LQFP64, LQFP80, and HVQFN48 packages. On the HVQFN48 package only, channel C has all the modem pins. Channels A and B have only RTSn and CTSn pins and channel D does not have any modem pin. 2. Features and benefits 4 channel UART 5 V, 3.3 V and 2.5 V operation Industrial temperature range (-40 C to +85 C) The SC16C554B is pin and software compatible with the industry-standard ST16C454/554, ST68C454/554, ST16C554, TL16C554 The SC16C554DB is pin and software compatible with ST16C554D, and software compatible with ST16C454/554, ST16C554, TL16C554 Up to 5 Mbit/s data rate at 5 V and 3.3 V, and 3 Mbit/s at 2.5 V 5 V tolerant on input only pins1 16-byte transmit FIFO 16-byte receive FIFO with error flags Programmable auto-RTS and auto-CTS In auto-CTS mode, CTS controls transmitter In auto-RTS mode, RX FIFO contents and threshold control RTS 1. For data bus pins D7 to D0, see Table 24 "Limiting values". NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs Automatic hardware flow control (RTS/CTS) Software selectable baud rate generator Four selectable Receive FIFO interrupt trigger levels Standard modem interface Standard asynchronous error and framing bits (Start, Stop, and Parity Overrun Break) Transmit, Receive, Line Status, and Data Set interrupts independently controlled Fully programmable character formatting: 5-bit, 6-bit, 7-bit, or 8-bit characters Even, odd, or no-parity formats 1, 112, or 2-stop bit Baud generation (DC to 5 Mbit/s) False start-bit detection Complete status reporting capabilities 3-state output TTL drive capabilities for bidirectional data bus and control bus Line break generation and detection Internal diagnostic capabilities: Loopback controls for communications link fault isolation Prioritized interrupt system controls Modem control functions (CTS, RTS, DSR, DTR, RI, CD). 3. Ordering information Table 1. Ordering information Package Name SC16C554BIB64 SC16C554BIB80 SC16C554BIBM SC16C554BIBS SC16C554DBIA68 SC16C554DBIB64 LQFP64 LQFP80 LQFP64 HVQFN48 PLCC68 LQFP64 Description plastic low profile quad flat package; 64 leads; body 10 x 10 x 1.4 mm plastic low profile quad flat package; 80 leads; body 12 x 12 x 1.4 mm plastic low profile quad flat package; 64 leads; body 7 x 7 x 1.4 mm plastic thermal enhanced very thin quad flat package; no leads; 48 terminals; body 6 x 6 x 0.85 mm plastic leaded chip carrier; 68 leads plastic low profile quad flat package; 64 leads; body 10 x 10 x 1.4 mm Version SOT314-2 SOT315-1 SOT414-1 SOT778-3 SOT188-2 SOT314-2 Type number SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 2 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 4. Block diagram SC16C554B/554DB TRANSMIT FIFO REGISTERS TRANSMIT SHIFT REGISTER TXA to TXD D0 to D7 IOR IOW RESET DATA BUS AND CONTROL LOGIC FLOW CONTROL LOGIC INTERCONNECT BUS LINES AND CONTROL SIGNALS RECEIVE FIFO REGISTERS RECEIVE SHIFT REGISTER RXA to RXD A0 to A2 CSA to CSD REGISTER SELECT LOGIC FLOW CONTROL LOGIC 16/68 DTRA to DTRD RTSA to RTSD INTA to INTD TXRDY RXRDY INTERRUPT CONTROL LOGIC CLOCK AND BAUD RATE GENERATOR MODEM CONTROL LOGIC CTSA to CTSD RIA to RID CDA to CDD DSRA to DSRD INTSEL 002aaa877 XTAL1 XTAL2 CLKSEL Fig 1. Block diagram of SC16C554B/554DB (16 mode) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 3 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs SC16C554B/554DB TRANSMIT FIFO REGISTERS TRANSMIT SHIFT REGISTER TXA to TXD D0 to D7 R/W RESET DATA BUS AND CONTROL LOGIC FLOW CONTROL LOGIC INTERCONNECT BUS LINES AND CONTROL SIGNALS RECEIVE FIFO REGISTERS RECEIVE SHIFT REGISTER RXA to RXD A0 to A4 CS REGISTER SELECT LOGIC FLOW CONTROL LOGIC 16/68 DTRA to DTRD RTSA to RTSD IRQ TXRDY RXRDY INTERRUPT CONTROL LOGIC CLOCK AND BAUD RATE GENERATOR MODEM CONTROL LOGIC CTSA to CTSD RIA to RID CDA to CDD DSRA to DSRD 002aaa878 XTAL1 XTAL2 CLKSEL Fig 2. Block diagram of SC16C554B/554DB (68 mode) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 4 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 5. Pinning information 5.1 Pinning 5.1.1 PLCC68 65 INTSEL GND DSRA 10 CTSA 11 DTRA 12 VCC 13 RTSA 14 INTA 15 CSA 16 TXA 17 IOW 18 TXB 19 CSB 20 INTB 21 RTSB 22 GND 23 DTRB 24 CTSB 25 DSRB 26 CDB 27 RIB 28 RXB 29 VCC 30 n.c. 31 A2 32 A1 33 A0 34 XTAL1 35 XTAL2 36 RESET 37 RXRDY 38 TXRDY 39 GND 40 RXC 41 RIC 42 CDC 43 61 CDD 60 DSRD 59 CTSD 58 DTRD 57 GND 56 RTSD 55 INTD 54 CSD 53 TXD 52 IOR 51 TXC 50 CSC 49 INTC 48 RTSC 47 VCC 46 DTRC 45 CTSC 44 DSRC 002aaa879 (c) NXP B.V. 2010. All rights reserved. CDA 63 RXD RXA 64 VCC SC16C554DBIA68 16 mode Fig 3. Pin configuration for PLCC68 (16 mode) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. Product data sheet Rev. 4 -- 8 June 2010 62 RID RIA D7 D6 D5 D4 D3 68 D2 67 D1 66 D0 9 8 7 6 5 4 3 2 1 5 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs GND DSRA 10 CTSA 11 DTRA 12 VCC 13 RTSA 14 IRQ 15 CS 16 TXA 17 R/W 18 TXB 19 A3 20 n.c. 21 RTSB 22 GND 23 DTRB 24 CTSB 25 DSRB 26 CDB 27 RIB 28 RXB 29 VCC 30 16/68 31 A2 32 A1 33 A0 34 XTAL1 35 XTAL2 36 RESET 37 RXRDY 38 TXRDY 39 GND 40 RXC 41 RIC 42 CDC 43 61 CDD 60 DSRD 59 CTSD 58 DTRD 57 GND 56 RTSD 55 n.c. 54 n.c. 53 TXD 52 n.c. 51 TXC 50 A4 49 n.c. 48 RTSC 47 VCC 46 DTRC 45 CTSC 44 DSRC 002aaa880 (c) NXP B.V. 2010. All rights reserved. CDA 63 RXD RXA 64 VCC SC16C554DBIA68 68 mode Fig 4. Pin configuration for PLCC68 (68 mode) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. Product data sheet Rev. 4 -- 8 June 2010 62 RID RIA 65 n.c. D7 D6 D5 D4 D3 68 D2 67 D1 66 D0 9 8 7 6 5 4 3 2 1 6 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 5.1.2 LQFP64 61 GND 49 CDD 64 CDA 51 RXD 62 RXA 52 VCC DSRA CTSA DTRA VCC RTSA INTA CSA TXA IOW 1 2 3 4 5 6 7 8 9 50 RID 63 RIA 60 D7 59 D6 58 D5 57 D4 56 D3 55 D2 54 D1 53 D0 48 DSRD 47 CTSD 46 DTRD 45 GND 44 RTSD 43 INTD 42 CSD SC16C554BIB64 SC16C554DBIB64 SC16C554BIBM 41 TXD 40 IOR 39 TXC 38 CSC 37 INTC 36 RTSC 35 VCC 34 DTRC 33 CTSC TXB 10 CSB 11 INTB 12 RTSB 13 GND 14 DTRB 15 CTSB 16 DSRB 17 CDB 18 RIB 19 RXB 20 VCC 21 A2 22 A1 23 A0 24 XTAL1 25 XTAL2 26 RESET 27 GND 28 RXC 29 RIC 30 CDC 31 DSRC 32 002aaa881 Fig 5. Pin configuration for LQFP64 SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 7 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 5.1.3 LQFP80 79 DSRD 62 DSRC 77 DTRD 64 DTRC 78 CTSD 75 RTSD 66 RTSC 63 CTSC 74 INTD 67 INTC 76 GND 73 CSD 68 CSC 72 TXD 69 TXC 65 VCC 70 IOR 80 n.c. 71 n.c. n.c. CDD RID RXD VCC INTSEL D0 D1 D2 1 2 3 4 5 6 7 8 9 61 n.c. 60 n.c. 59 CDC 58 RIC 57 RXC 56 GND 55 TXRDY 54 RXRDY 53 RESET 52 n.c. 51 XTAL2 50 XTAL1 49 n.c. 48 A0 47 A1 46 A2 45 VCC 44 RXB 43 RIB 42 CDB 41 n.c. n.c. 10 D3 11 D4 12 D5 13 D6 14 D7 15 GND 16 RXA 17 RIA 18 CDA 19 n.c. 20 SC16C554BIB80 n.c. 21 DSRA 22 CTSA 23 DTRA 24 VCC 25 RTSA 26 INTA 27 CSA 28 TXA 29 n.c. 30 IOW 31 TXB 32 CSB 33 INTB 34 RTSB 35 GND 36 DTRB 37 CTSB 38 DSRB 39 n.c. 40 002aaa882 Fig 6. Pin configuration for LQFP80 SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 8 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 5.1.4 HVQFN48 47 GND 37 GND 36 INTD 35 CSD 34 TXD 33 IOR 32 TXC 31 CSC 30 INTC 29 RTSC 28 VCC 27 DTRC 26 CTSC 25 DSRC RXB 13 16/68 14 A2 15 A1 16 A0 17 XTAL1 18 XTAL2 19 RESET 20 GND 21 RXC 22 RIC 23 CDC 24 37 GND 36 n.c. 35 CSD 34 TXD 33 IOR 32 TXC 31 A4 30 n.c. 29 RTSC 28 VCC 27 DTRC 26 CTSC 25 DSRC RXB 13 16/68 14 A2 15 A1 16 A0 17 XTAL1 18 XTAL2 19 RESET 20 GND 21 RXC 22 RIC 23 CDC 24 002aab554 002aab552 46 D7 45 D6 44 D5 43 D4 42 D3 41 D2 40 D1 40 D1 CTSA VCC RTSA INTA CSA TXA IOW TXB CSB 1 2 3 4 5 6 7 8 9 SC16C554BIBS 16 mode INTB 10 RTSB 11 CTSB 12 Transparent top view Fig 7. Pin configuration for HVQFN (16 mode) 47 GND 39 D0 39 D0 terminal 1 index area 46 D7 45 D6 44 D5 43 D4 42 D3 CTSA VCC RTSA IRQ CS TXA R/W TXB A3 1 2 3 4 5 6 7 8 9 SC16C554BIBS 68 mode n.c. 10 RTSB 11 CTSB 12 Transparent top view Fig 8. Pin configuration for HVQFN (68 mode) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. 41 D2 terminal 1 index area 38 RXD 48 RXA 38 RXD 48 RXA (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 9 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 5.2 Pin description Table 2. Symbol 16/68 Pin description Pin PLCC68 LQFP64 LQFP80 HVQFN48 31 14 I 16/68 Interface type select (input with internal pull-up). This input provides the 16 (Intel) or 68 (Motorola) bus interface type select. The functions of IOR, IOW, INTA to INTD, and CSA to CSD are re-assigned with the logic state of this pin. When this pin is a logic 1, the 16 mode interface (16C554) is selected. When this pin is a logic 0, the 68 mode interface (68C554) is selected. When this pin is a logic 0, IOW is re-assigned to R/W, RESET is re-assigned to RESET, IOR is not used, and INTA to INTD are connected in a wire-OR configuration. The wire-OR outputs are connected internally to the open-drain IRQ signal output. This pin is not available on 64-pin packages which operate in the 16 mode only. Address 0 select bit. Internal registers address selection in 16 and 68 modes. Address 1 select bit. Internal registers address selection in 16 and 68 modes. Address 2 select bit. Internal registers address selection in 16 and 68 modes. Address 3 to Address 4 select bits. When the 68 mode is selected, these pins are used to address or select individual UARTs (providing CS is a logic 0). In the 16 mode, these pins are re-assigned as chip selects, see CSB and CSC. Carrier Detect (active LOW). These inputs are associated with individual UART channels A through D. A logic 0 on this pin indicates that a carrier has been detected by the modem for that channel. Chip Select (active LOW). In the 68 mode, this pin functions as a multiple channel chip enable. In this case, all four UARTs (A to D) are enabled when the CS pin is a logic 0. An individual UART channel is selected by the data contents of address bits A3 to A4. when the 16 mode is selected (68-pin devices), this pin functions as CSA (see definition under CSA, CSB). Chip Select A, B, C, D (active LOW). This function is associated with the 16 mode only, and for individual channels `A' through `D'. When in 16 mode, these pins enable data transfers between the user CPU and the SC16C554B/554DB for the channel(s) addressed. Individual UART sections (A, B, C, D) are addressed by providing a logic 0 on the respective CSA to CSD pin. When the 68 mode is selected, the functions of these pins are re-assigned. 68 mode functions are described under their respective name/pin headings. Type Description A0 A1 A2 A3 A4 34 33 32 20 50 24 23 22 - 48 47 46 - 17 16 15 9 31 I I I I I CDA CDB CDC CDD CS 9 27 43 61 16 64 18 31 49 - 19 42 59 2 - 24 5 I I I I I CSA CSB CSC CSD 16 20 50 54 7 11 38 42 28 33 68 73 5 9 31 35 I I I I SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 10 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs Table 2. Symbol CTSA CTSB CTSC CTSD Pin description ...continued Pin PLCC68 LQFP64 LQFP80 HVQFN48 11 25 45 59 2 16 33 47 23 38 63 78 1 12 26 I I I I Clear to Send (active LOW). These inputs are associated with individual UART channels A to D. A logic 0 on the CTSn pin indicates the modem or data set is ready to accept transmit data from the SC16C554B/554DB. Status can be tested by reading MSR[4]. This pin only affects the transmit or receive operations when auto-CTS function is enabled via MCR[5] for hardware flow control operation. Data bus (bidirectional). These pins are the 8-bit, 3-state data bus for transferring information to or from the controlling CPU. D0 is the least significant bit and the first data bit in a transmit or receive serial data stream. Type Description D0 D1 D2 D3 D4 D5 D6 D7 DSRA DSRB DSRC DSRD DTRA DTRB DTRC DTRD 66 67 68 1 2 3 4 5 10 26 44 60 12 24 46 58 53 54 55 56 57 58 59 60 1 17 32 48 3 15 34 46 7 8 9 11 12 13 14 15 22 39 62 79 24 37 64 77 39 40 41 42 43 44 45 46 25 27 - I/O I/O I/O I/O I/O I/O I/O I/O I I I I O O O O Data Set Ready (active LOW). These inputs are associated with individual UART channels, A through D. A logic 0 on this pin indicates the modem or data set is powered-on and is ready for data exchange with the UART. This pin has no effect on the UART's transmit or receive operation. Data Terminal Ready (active LOW). These outputs are associated with individual UART channels, A through D. A logic 0 on this pin indicates that the SC16C554B/554DB is powered-on and ready. This pin can be controlled via the Modem Control Register. Writing a logic 1 to MCR[0] will set the DTRn output to logic 0, enabling the modem. This pin will be a logic 1 after writing a logic 0 to MCR[0], or after a reset. This pin has no effect on the UART's transmit or receive operation. Signal and power ground. Interrupt A, B, C, D (active HIGH). This function is associated with the 16 mode only. These pins provide individual channel interrupts INTA to INTD. INTA to INTD are enabled when MCR[3] is set to a logic 1, interrupts are enabled in the Interrupt Enable Register (IER), and when an interrupt condition exists. Interrupt conditions include: receiver errors, available receiver buffer data, transmit buffer empty, or when a modem status flag is detected. When the 68 mode is selected, the functions of these pins are re-assigned. 68 mode functions are described under their respective name/pin headings. GND INTA INTB INTC INTD 6, 23, 40, 57 15 21 49 55 14, 28, 45, 61 6 12 37 43 16, 36, 56, 76 27 34 67 74 21, 37, 47[1] 4 10 30 36 I O O O O SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 11 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs Table 2. Symbol INTSEL Pin description ...continued Pin PLCC68 LQFP64 LQFP80 HVQFN48 65 6 I Interrupt Select (active HIGH, with internal pull-down). This function is associated with the 16 mode only. When the 16 mode is selected, this pin can be used in conjunction with MCR[3] to enable or disable the 3-state interrupts, INTA to INTD, or override MCR[3] and force continuous interrupts. Interrupt outputs are enabled continuously by making this pin a logic 1. Making this pin a logic 0 allows MCR[3] to control the 3-state interrupt output. In this mode, MCR[3] is set to a logic 1 to enable the 3-state outputs. This pin is disabled in the 68 mode. Due to pin limitations on the 64-pin packages, this pin is not available. To cover this limitation, the SC16C554DBIB64 version operates in the continuous interrupt enable mode by bonding this pin to VCC internally. The SC16C554BIB64 operates with MCR[3] control by bonding this pin to GND. The INTSEL pin is not available on the HVQFN48 package. Input/Output Read strobe (active LOW). This function is associated with the 16 mode only. A logic 0 transition on this pin will load the contents of an internal register defined by address bits A0 to A2 onto the SC16C554B/554DB data bus (D0 to D7) for access by external CPU. This pin is disabled in the 68 mode. Input/Output Write strobe (active LOW). This function is associated with the 16 mode only. A logic 0 transition on this pin will transfer the contents of the data bus (D0 to D7) from the external CPU to an internal register that is defined by address bits A0 to A2. When the 68 mode is selected, this pin functions as R/W (see definition under R/W). Interrupt Request or Interrupt `A'. This function is associated with the 68 mode only. In the 68 mode, interrupts from UART channels A to D are wire-ORed internally to function as a single IRQ interrupt. This pin transitions to a logic 0 (if enabled by the Interrupt Enable Register) whenever a UART channel(s) requires service. Individual channel interrupt status can be determined by addressing each channel through its associated internal register, using CS and A3 to A4. In the 68 mode, and external pull-up resistor must be connected between this pin and VCC. The function of this pin changes to INTA when operating in the 16 mode (see definition under INTA). not connected Type Description IOR 52 40 70 33 I IOW 18 9 31 7 I IRQ 15 - - 4 O n.c. 21, 49, 52, 54, 55, 65 - 1, 10, 20, 21, 30, 40, 41, 49, 52, 60, 61, 71, 80 - - SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 12 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs Table 2. Symbol RESET (RESET) Pin description ...continued Pin PLCC68 LQFP64 LQFP80 HVQFN48 37 27 53 20 I Reset. In the 16 mode, a logic 1 on this pin will reset the internal registers and all the outputs. The UART transmitter output and the receiver input will be disabled during reset time. (See Section 7.10 "SC16C554B/554DB external reset conditions" for initialization details.) When 16/68 is a logic 0 (68 mode), this pin functions similarly, bus as an inverted reset interface signal, RESET. Ring Indicator (active LOW). These inputs are associated with individual UART channels, A to D. A logic 0 on this pin indicates the modem has received a ringing signal from the telephone line. A logic 1 transition on this input pin will generate an interrupt. Request to Send (active LOW). These outputs are associated with individual UART channels, A to D. A logic 0 on the RTSn pin indicates the transmitter has data ready and waiting to send. Writing a logic 1 in the Modem Control Register MCR[1] will set this pin to a logic 0, indicating data is available. After a reset this pin will be set to a logic 1. This pin only affects the transmit and receive operations when auto-RTS function is enabled via MCR[5] for hardware flow control operation. Read/Write strobe. This function is associated with the 68 mode only. This pin provides the combined functions for Read or Write strobes. Logic 1 = Read from UART register selected by CS and A0 to A4. Logic 0 = Write to UART register selected by CS and A0 to A4. Type Description RIA RIB RIC RID RTSA RTSB RTSC RTSD 8 28 42 62 14 22 48 56 63 19 30 50 5 13 36 44 18 43 58 3 26 35 66 75 23 3 11 29 - I I I I O O O O R/W 18 - - 7 I RXA RXB RXC RXD 7 29 41 63 62 20 29 51 17 44 57 4 48 13 22 38 I I I I Receive data input RXA to RXD. These inputs are associated with individual serial channel data to the SC16C554B/554DB. The RXn signal will be a logic 1 during reset, idle (no data), or when the transmitter is disabled. During the local Loopback mode, the RXn input pin is disabled and TX data is connected to the UART RX input internally. Receive Ready (active LOW). RXRDY contains the wire-ORed status of all four receive channel FIFOs, RXRDYA to RXRDYD. A logic 0 indicates receive data ready status, that is, the RHR is full, or the FIFO has one or more RX characters available for unloading. This pin goes to a logic 1 when the FIFO/RHR is empty, or when there are no more characters available in either the FIFO or RHR. Individual channel RX status is read by examining individual internal registers via CS and A0 to A4 pin functions. The RXRDY pin is not available on the HVQFN48 package. RXRDY 38 - 54 - O SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 13 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs Table 2. Symbol TXA TXB TXC TXD Pin description ...continued Pin PLCC68 LQFP64 LQFP80 HVQFN48 17 19 51 53 8 10 39 41 29 32 69 72 6 8 32 34 O O O O Transmit data A, B, C, D. These outputs are associated with individual serial transmit channel data from the SC16C554B/554DB. The TX signal will be a logic 1 during reset, idle (no data), or when the transmitter is disabled. During the local Loopback mode, the TXn output pin is disabled and TX data is internally connected to the UART RX input. Transmit Ready (active LOW). TXRDY contains the wire-ORed status of all four transmit channel FIFOs, TXRDYA to TXRDYD. A logic 0 indicates a buffer ready status, that is, at least one location is empty and available in one of the TX channels (A to D). This pin goes to a logic 1 when all four channels have no more empty locations in the TX FIFO or THR. Individual channel TX status can be read by examining individual internal registers via CS and A0 to A4 pin functions. The TXRDY pin is not available on the HVQFN48 package. Power supply inputs. Crystal or external clock input. Functions as a crystal input or as an external clock input. A crystal can be connected between this pin and XTAL2 to form an internal oscillator circuit (see Figure 13). Alternatively, an external clock can be connected to this pin to provide custom data rates. (See Section 6.6 "Programmable baud rate generator".) Output of the crystal oscillator or buffered clock. (See also XTAL1.) Crystal oscillator output or buffered clock output. Type Description TXRDY 39 - 55 - O VCC XTAL1 13, 30, 47, 64 35 4, 21, 35, 52 25 5, 25, 45, 65 50 2, 28 18 I I XTAL2 36 26 51 19 O [1] HVQFN48 package die supply ground is connected to both GND pins and exposed center pad. GND pins must be connected to supply ground for proper device operation. For enhanced thermal, electrical, and board level performance, the exposed pad needs to be soldered to the board using a corresponding thermal pad on the board and for proper heat conduction through the board, thermal vias need to be incorporated in the PCB in the thermal pad region. SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 14 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 6. Functional description The SC16C554B/554DB provides serial asynchronous receive data synchronization, parallel-to-serial and serial-to-parallel data conversions for both the transmitter and receiver sections. These functions are necessary for converting the serial data stream into parallel data that is required with digital data systems. Synchronization for the serial data stream is accomplished by adding start and stop bits to the transmit data to form a data character. Data integrity is insured by attaching a parity bit to the data character. The parity bit is checked by the receiver for any transmission bit errors. The electronic circuitry to provide all these functions is fairly complex, especially when manufactured on a single integrated silicon chip. The SC16C554B/554DB represents such an integration with greatly enhanced features. The SC16C554B/554DB is fabricated with an advanced CMOS process to achieve low drain power and high speed requirements. The SC16C554B/554DB is an upward solution that provides 16 bytes of transmit and receive FIFO memory, instead of none in the 16C454. The SC16C554B/554DB is designed to work with high speed modems and shared network environments that require fast data processing time. Increased performance is realized in the SC16C554B/554DB by the larger transmit and receive FIFOs. This allows the external processor to handle more networking tasks within a given time. In addition, the four selectable levels of FIFO trigger interrupt is uniquely provided for maximum data throughput performance, especially when operating in a multi-channel environment. The combination of the above greatly reduces the bandwidth requirement of the external controlling CPU, increases performance, and reduces power consumption. The SC16C554B/554DBAI68 combines the package interface modes of the 16C454/554 and 68C454/554 series on a single integrated chip. The 16 mode interface is designed to operate with the Intel-type of microprocessor bus, while the 68 mode is intended to operate with Motorola and other popular microprocessors. Following a reset, the SC16C554B/554DBAI68 is downward compatible with the 16C454/554 or the 68C454/554, dependent on the state of the interface mode selection pin, 16/68. The SC16C554B/554DB is capable of operation to 1.5 Mbit/s with a 24 MHz crystal and up to 5 Mbit/s with an external clock input (at 3.3 V and 5 V; at 2.5 V the maximum speed is 3 Mbit/s). The rich feature set of the SC16C554B/554DB is available through internal registers. Selectable receive FIFO trigger levels, selectable transmit and receive baud rates, and modem interface controls are all standard features. In the 16 mode, INTSEL and MCR[3] can be configured to provide a software controlled or continuous interrupt capability. Due to pin limitations of the 64-pin package, this feature is offered by two different LQFP64 packages. The SC16C554DB operates in the continuous interrupt enable mode by bonding INTSEL to VCC internally. The SC16C554B operates in conjunction with MCR[3] by bonding INTSEL to GND internally. SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 15 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 6.1 Interface options Two user interface modes are selectable for the PLCC68 package. These interface modes are designated as the `16 mode' and the `68 mode'. This nomenclature corresponds to the early 16C454/554 and 68C454/554 package interfaces respectively. 6.1.1 The 16 mode interface The 16 mode configures the package interface pins for connection as a standard 16 series (Intel) device and operates similar to the standard CPU interface available on the 16C454/554. In the 16 mode (pin 16/68 = logic 1), each UART is selected with individual chip select (CSn) pins, as shown in Table 3. Table 3. CSA 1 0 1 1 1 Serial port channel selection, 16 mode interface CSB 1 1 0 1 1 CSC 1 1 1 0 1 CSD 1 1 1 1 0 UART channel none A B C D 6.1.2 The 68 mode interface The 68 mode configures the package interface pins for connection with Motorola, and other popular microprocessor bus types. The interface operates similar to the 68C454/554. In this mode, the SC16C554B/554DB decodes two additional addresses, A3 to A4, to select one of the four UART ports. The A3 to A4 address decode function is used only when in the 68 mode (16/68 = logic 0), and is shown in Table 4. Table 4. CS 1 0 0 0 0 Serial port channel selection, 68 mode interface A4 n/a 0 0 1 1 A3 n/a 0 1 0 1 UART channel none A B C D SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 16 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 6.2 Internal registers The SC16C554B/554DB provides 12 internal registers for monitoring and control. These registers are shown in Table 5. These registers function as data holding registers (THR/RHR), interrupt status and control registers (IER/ISR), a FIFO Control Register (FCR), line status and control registers (LCR/LSR), modem status and control registers (MCR/MSR), programmable data rate (clock) control registers (DLL/DLM), and a user accessible Scratchpad Register (SPR). Register functions are more fully described in the following paragraphs. Table 5. A2 0 0 0 0 1 1 1 1 0 0 [1] [2] Internal registers decoding A1 0 0 1 1 0 0 1 1 0 0 A0 0 1 0 1 0 1 0 1 0 1 Read mode Receive Holding Register Interrupt Enable Register Interrupt Status Register Line Control Register Modem Control Register Line Status Register Modem Status Register Scratchpad Register (DLL/DLM)[2] LSB of Divisor Latch MSB of Divisor Latch LSB of Divisor Latch MSB of Divisor Latch Write mode Transmit Holding Register Interrupt Enable Register FIFO Control Register Line Control Register Modem Control Register n/a n/a Scratchpad Register General register set (THR/RHR, IER/ISR, MCR/MSR, FCR, LCR/LSR, SPR)[1] Baud rate register set These registers are accessible only when LCR[7] is a logic 0. These registers are accessible only when LCR[7] is a logic 1. 6.3 FIFO operation The 16 byte transmit and receive data FIFOs are enabled by the FIFO Control Register (FCR) bit 0. With SC16C554B devices, the user can set the receive trigger level, but not the transmit trigger level. The receiver FIFO section includes a time-out function to ensure data is delivered to the external CPU. An interrupt is generated whenever the Receive Holding Register (RHR) has not been read following the loading of a character or the receive trigger level has not been reached. Table 6. Flow control mechanism INTn pin activation 1 4 8 14 Negate RTS 4 8 12 14 Assert RTS 1 4 8 10 Selected trigger level (characters) 1 4 8 14 SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 17 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 6.4 Autoflow control (see Figure 9) Autoflow control is comprised of auto-CTS and auto-RTS. With auto-CTS, the CTS input must be active before the transmitter FIFO can emit data. With auto-RTS, RTS becomes active when the receiver needs more data and notifies the sending serial device. When RTS is connected to CTS, data transmission does not occur unless the receiver FIFO has space for the data; thus, overrun errors are eliminated using UART 1 and UART 2 from a SC16C554B/554DB with the autoflow control enabled. If not, overrun errors occur when the transmit data rate exceeds the receiver FIFO read latency. UART 1 SERIAL TO PARALLEL RX FIFO FLOW CONTROL D7 to D0 PARALLEL TO SERIAL TX FIFO FLOW CONTROL CTS RTS TX RX RTS CTS UART 2 PARALLEL TO SERIAL TX FIFO FLOW CONTROL D7 to D0 SERIAL TO PARALLEL RX FIFO FLOW CONTROL 002aaa228 RX TX Fig 9. Autoflow control (auto-RTS and auto-CTS) example 6.4.1 Auto-RTS (see Figure 9) Auto-RTS data flow control originates in the receiver timing and control block (see block diagrams in Figure 1 and Figure 2) and is linked to the programmed receiver FIFO trigger level. When the receiver FIFO level reaches a trigger level of 1, 4, or 8 (see Figure 11), RTS is de-asserted. With trigger levels of 1, 4, and 8, the sending UART may send an additional byte after the trigger level is reached (assuming the sending UART has another byte to send) because it may not recognize the de-assertion of RTS until after it has begun sending the additional byte. RTS is automatically reasserted once the RX FIFO is emptied by reading the receiver buffer register. When the trigger level is 14 (see Figure 12), RTS is de-asserted after the first data bit of the 16th character is present on the RX line. RTS is reasserted when the RX FIFO has at least one available byte space. Remark: Auto-RTS is not supported in channel D of the HVQFN48 package, therefore MCR[5] of channel D should not be written. 6.4.2 Auto-CTS (see Figure 9) The transmitter circuitry checks CTS before sending the next data byte. When CTS is active, it sends the next byte. To stop the transmitter from sending the following byte, CTS must be released before the middle of the last stop bit that is currently being sent (see Figure 10). The auto-CTS function reduces interrupts to the host system. When flow control is enabled, CTS level changes do not trigger host interrupts because the device automatically controls its own transmitter. Without auto-CTS, the transmitter sends any data present in the transmit FIFO and a receiver overrun error may result. SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 18 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs Remark: Auto-CTS is not supported in channel D of the HVQFN48 package, therefore MCR[5] of channel D should not be written. 6.4.3 Enabling autoflow control and auto-CTS Autoflow control is enabled by setting MCR[5] and MCR[1]. Table 7. MCR[5] 1 1 0 Enabling autoflow control and auto-CTS MCR[1] 1 0 X Selection auto RTS and CTS auto CTS disable 6.4.4 Auto-CTS and auto-RTS functional timing TX Start bits 0 to 7 Stop Start bits 0 to 7 Stop Start bits 0 to 7 Stop CTS 002aaa049 (1) When CTS is LOW, the transmitter keeps sending serial data out. (2) If CTS goes HIGH before the middle of the last stop bit of the current byte, the transmitter finishes sending the current byte, but is does not send the next byte. (3) When CTS goes from HIGH to LOW, the transmitter begins sending data again. Fig 10. CTS functional timing waveforms The receiver FIFO trigger level can be set to 1 byte, 4 bytes, 8 bytes, or 14 bytes. These are described in Figure 11 and Figure 12. RX Start byte N Stop Start byte N + 1 Stop Start byte Stop RTS IOR 1 2 N N+1 002aaa050 (1) N = RCV FIFO trigger level (1 byte, 4 bytes, or 8 bytes). (2) The two blocks in dashed lines cover the case where an additional byte is sent as described in Section 6.4.1. Fig 11. RTS functional timing waveforms, RCV FIFO trigger level = 1 byte, 4 bytes, or 8 bytes SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 19 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs RX byte 14 byte 15 RTS released after the first data bit of byte 16 Start byte 16 Stop Start byte 18 Stop RTS IOR 002aaa051 (1) RTS is de-asserted when the receiver receives the first data bit of the sixteenth byte. The receive FIFO is full after finishing the sixteenth byte. (2) RTS is asserted again when there is at least one byte of space available and no incoming byte is in processing, or there is more than one byte of space available. (3) When the receive FIFO is full, the first receive buffer register read re-asserts RTS. Fig 12. RTS functional timing waveforms, RCV FIFO trigger level = 14 bytes 6.5 Hardware/software and time-out interrupts Following a reset, if the transmitter interrupt is enabled, the SC16C554B/554DB will issue an interrupt to indicate that the Transmit Holding Register is empty. This interrupt must be serviced prior to continuing operations. The LSR register provides the current singular highest priority interrupt only. Only after servicing the higher pending interrupt will the lower priority interrupt(s) be reflected in the status register. Servicing the interrupt without investigating further interrupt conditions can result in data errors. When two interrupt conditions have the same priority, it is important to service these interrupts correctly. Receive Data Ready and Receive Time-Out have the same interrupt priority (when enabled by IER[0]). The receiver issues an interrupt after the number of characters have reached the programmed trigger level. In this case, the SC16C554B/554DB FIFO may hold more characters than the programmed trigger level. Following the removal of a data byte, the user should re-check LSR[0] for additional characters. A Receive Time-Out will not occur if the receive FIFO is empty. The time-out counter is reset at the center of each stop bit received or each time the Receive Holding Register (RHR) is read. The actual time-out value is 4 character time. In the 16 mode for the PLCC68 package, the system/board designer can optionally provide software controlled 3-state interrupt operation. This is accomplished by INTSEL and MCR[3]. When INTSEL interface pin is left open or made a logic 0, MCR[3] controls the 3-state interrupt outputs, INTA to INTD. When INTSEL is a logic 1, MCR[3] has no effect on the INTA to INTD outputs, and the package operates with interrupt outputs enabled continuously. 6.6 Programmable baud rate generator The SC16C554B/554DB supports high speed modem technologies that have increased input data rates by employing data compression schemes. For example, a 33.6 kbit/s modem that employs data compression may require a 115.2 kbit/s input data rate. A 128.0 kbit/s ISDN modem that supports data compression may need an input data rate of 460.8 kbit/s. SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 20 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs A single baud rate generator is provided for the transmitter and receiver, allowing independent TX/RX channel control. The programmable Baud Rate Generator is capable of accepting an input clock up to 80 MHz (for 3.3 V and 5 V operation), as required for supporting a 5 Mbit/s data rate. The SC16C554B/554DB can be configured for internal or external clock operation. For internal clock oscillator operation, an industry standard microprocessor crystal (parallel resonant/22 pF to 33 pF load) is connected externally between the XTAL1 and XTAL2 pins (see Figure 13). Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal baud rate generator for standard or custom rates (see Table 8). XTAL1 XTAL2 XTAL1 XTAL2 1.5 k X1 1.8432 MHz X1 1.8432 MHz C1 22 pF C2 33 pF C1 22 pF C2 47 pF 002aaa870 Fig 13. Crystal oscillator connection Programming the Baud Rate Generator registers DLM (MSB) and DLL (LSB) provides a user capability for selecting the desired final baud rate. Table 8. Baud rate generator programming table using a 7.3728 MHz clock User 16x clock divisor Decimal 2304 384 192 96 48 24 12 6 3 2 1 Hexadecimal 900 180 C0 60 30 18 0C 06 03 02 01 DLM program value (hex) 09 01 00 00 00 00 00 00 00 00 00 DLL program value (hex) 00 80 C0 60 30 18 0C 06 03 02 01 Output baud rate (bit/s) 200 1200 2400 4800 9600 19.2 k 38.4 k 76.8 k 153.6 k 230.4 k 460.8 k SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 21 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 6.7 DMA operation The SC16C554B/554DB FIFO trigger level provides additional flexibility to the user for block mode operation. LSR[6:5] provide an indication when the transmitter is empty or has an empty location(s). The user can optionally operate the transmit and receive FIFOs in the DMA mode (FCR[3]). When the transmit and receive FIFOs are enabled and the DMA mode is de-activated (DMA Mode 0), the SC16C554B/554DB activates the interrupt output pin for each data transmit or receive operation. When DMA mode is activated (DMA Mode 1), the user takes the advantage of block mode operation by loading or unloading the FIFO in a block sequence determined by the preset trigger level. In this mode, the SC16C554B/554DB sets the interrupt output pin when the characters in the receive FIFOs are above the receive trigger level. Remark: DMA operation is not supported in the HVQFN48 package. 6.8 Loopback mode The internal loopback capability allows on-board diagnostics. In the Loopback mode, the normal modem interface pins are disconnected and reconfigured for loopback internally. MCR[3:0] register bits are used for controlling loopback diagnostic testing. In the Loopback mode, OP2 and OP1 in the MCR register (bits 3:2) control the modem RI and CD inputs, respectively. MCR signals RTS and DTR (bits 1:0) are used to control the modem CTS and DSR inputs, respectively. The transmitter output (TX) and the receiver input (RX) are disconnected from their associated interface pins, and instead are connected together internally (see Figure 14). The CTS, DSR, CD, and RI are disconnected from their normal modem control input pins, and instead are connected internally to RTS, DTR, OP2 and OP1. Loopback test data is entered into the Transmit Holding Register via the user data bus interface, D0 to D7. The transmit UART serializes the data and passes the serial data to the receive UART via the internal loopback connection. The receive UART converts the serial data back into parallel data that is then made available at the user data interface D0 to D7. The user optionally compares the received data to the initial transmitted data for verifying error-free operation of the UART TX/RX circuits. In this mode, the receiver and transmitter interrupts are fully operational. The Modem Control Interrupts are also operational. However, the interrupts can only be read using lower four bits of the Modem Status Register (MSR[3:0]) instead of the four Modem Status Register bits 7:4. The interrupts are still controlled by the IER. SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 22 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs SC16C554B/554DB TRANSMIT FIFO REGISTERS DATA BUS AND CONTROL LOGIC FLOW CONTROL LOGIC TRANSMIT SHIFT REGISTER TXA to TXD D0 to D7 IOR IOW RESET INTERCONNECT BUS LINES AND CONTROL SIGNALS RECEIVE FIFO REGISTERS RECEIVE SHIFT REGISTER MCR[4] = 1 RXA to RXD A0 to A2 CSA to CSD REGISTER SELECT LOGIC FLOW CONTROL LOGIC RTSA to RTSD CTSA to CTSD DTRA to DTRD MODEM CONTROL LOGIC INTA to INTD TXRDY RXRDY INTERRUPT CONTROL LOGIC CLOCK AND BAUD RATE GENERATOR DSRA to DSRD OP1A to OP1D RIA to RID OP2A to OP2D CDA to CDD 002aaa883 XTAL1 XTAL2 Fig 14. Internal Loopback mode diagram (16 mode) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 23 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs SC16C554B/554DB (HVQFN48) TRANSMIT FIFO REGISTERS DATA BUS AND CONTROL LOGIC FLOW CONTROL LOGIC TRANSMIT SHIFT REGISTER TXA to TXD D0 to D7 IOR IOW RESET INTERCONNECT BUS LINES AND CONTROL SIGNALS RECEIVE FIFO REGISTERS RECEIVE SHIFT REGISTER MCR[4] = 1 RXA to RXD A0 to A2 CSA to CSD REGISTER SELECT LOGIC FLOW CONTROL LOGIC RTSA to RTSC CTSA to CTSC DTRC MODEM CONTROL LOGIC INTA to INTD INTERRUPT CONTROL LOGIC CLOCK AND BAUD RATE GENERATOR DSRC OP1C RIC OP2C CDC 002aab553 XTAL1 XTAL2 Fig 15. Internal Loopback mode diagram (16 mode) for HVQFN48 package SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 24 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs SC16C554B/554DB TRANSMIT FIFO REGISTERS TRANSMIT SHIFT REGISTER TXA to TXD D0 to D7 R/W RESET FLOW CONTROL LOGIC INTERCONNECT BUS LINES AND CONTROL SIGNALS RECEIVE FIFO REGISTERS RECEIVE SHIFT REGISTER MCR[4] = 1 DATA BUS AND CONTROL LOGIC RXA to RXD A0 to A4 CS REGISTER SELECT LOGIC FLOW CONTROL LOGIC RTSA to RTSD CTSA to CTSD 16/68 DTRA to DTRD IRQ TXRDY RXRDY INTERRUPT CONTROL LOGIC CLOCK AND BAUD RATE GENERATOR MODEM CONTROL LOGIC DSRA to DSRD OP1A to OP1D RIA to RID OP2A to OP2D CDA to CDD 002aaa884 XTAL1 XTAL2 Fig 16. Internal Loopback mode diagram (68 mode) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 25 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs SC16C554B/554DB (HVQFN48) TRANSMIT FIFO REGISTERS TRANSMIT SHIFT REGISTER TXA to TXD D0 to D7 R/W RESET FLOW CONTROL LOGIC INTERCONNECT BUS LINES AND CONTROL SIGNALS RECEIVE FIFO REGISTERS RECEIVE SHIFT REGISTER MCR[4] = 1 DATA BUS AND CONTROL LOGIC RXA to RXD A0 to A4 CS REGISTER SELECT LOGIC FLOW CONTROL LOGIC RTSC CTSC 16/68 DTRC IRQ INTERRUPT CONTROL LOGIC CLOCK AND BAUD RATE GENERATOR MODEM CONTROL LOGIC DSRC OP1C RIC OP2C CDC 002aab555 XTAL1 XTAL2 Fig 17. Internal Loopback mode diagram (68 mode) for HVQFN48 package SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 26 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 7. Register descriptions Table 9 details the assigned bit functions for the SC16C554B/554DB internal registers. The assigned bit functions are more fully defined in Section 7.1 through Section 7.10. Table 9. SC16C554B/554DB internal registers Bit 6 bit 6 bit 6 0 Bit 5 bit 5 bit 5 0 Bit 4 bit 4 bit 4 0 Bit 3 bit 3 bit 3 modem status interrupt DMA mode select[3] INT priority bit 2 parity enable Bit 2 bit 2 bit 2 Bit 1 bit 1 bit 1 Bit 0 bit 0 bit 0 receive holding register FIFO enable INT status word length bit 0 DTR set[2] XX XX 00 bit 7 bit 7 0 A2 A1 A0 Register Default[1] Bit 7 General Register 0 0 0 0 0 0 0 0 1 RHR THR IER receive transmit line status holding interrupt register XMIT RCVR FIFO reset FIFO reset INT priority bit 1 stop bits INT priority bit 0 word length bit 1 RTS 0 1 0 FCR 00 RCVR trigger (MSB) FIFOs enabled divisor latch enable 0 RCVR trigger (LSB) FIFOs enabled set break 0 reserved reserved 0 1 0 ISR 01 0 0 0 1 1 LCR 00 set parity even parity 1 0 0 MCR 00 autoflow loop back OP2, INTn control enable enable[4] trans. holding empty DSR bit 5 bit 5 bit 13 break interrupt CTS bit 4 bit 4 bit 12 framing error CD bit 3 bit 3 bit 11 OP1 1 0 1 LSR 60 FIFO data error CD bit 7 bit 7 bit 15 trans. empty RI bit 6 bit 6 bit 14 parity error overrun error RI bit 2 bit 2 bit 10 DSR bit 1 bit 1 bit 9 receive data ready CTS bit 0 bit 0 bit 8 1 1 0 0 [1] [2] [3] [4] [5] 1 1 0 0 0 1 0 1 MSR SPR DLL DLM X0 FF XX XX Special Register set[5] The value shown represents the register's initialized hexadecimal value; X = not applicable. These registers are accessible only when LCR[7] = 0. This function is not supported in the HVQFN48 package. Autoflow control is not supported by channel D of the HVQFN48 package, and this bit should not be written on channel D. The Special Register set is accessible only when LCR[7] is set to a logic 1. SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 27 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 7.1 Transmit Holding Register (THR) and Receive Holding Register (RHR) The serial transmitter section consists of an 8-bit Transmit Hold Register (THR) and Transmit Shift Register (TSR). The status of the THR is provided in the Line Status Register (LSR). Writing to the THR transfers the contents of the data bus (D7 to D0) to the THR, providing that the THR or TSR is empty. The THR empty flag in the LSR register will be set to a logic 1 when the transmitter is empty or when data is transferred to the TSR. Note that a write operation can be performed when the THR empty flag is set (logic 0 = FIFO full; logic 1 = at least one FIFO location available). The serial receive section also contains an 8-bit Receive Holding Register (RHR). Receive data is removed from the SC16C554B/554DB and receive FIFO by reading the RHR register. The receive section provides a mechanism to prevent false starts. On the falling edge of a start or false start bit, an internal receiver counter starts counting clocks at the 16x clock rate. After 712 clocks, the start bit time should be shifted to the center of the start bit. At this time the start bit is sampled, and if it is still a logic 0 it is validated. Evaluating the start bit in this manner prevents the receiver from assembling a false character. Receiver status codes will be posted in the LSR. 7.2 Interrupt Enable Register (IER) The Interrupt Enable Register (IER) masks the interrupts from receiver ready, transmitter empty, line status and modem status registers. These interrupts would normally be seen on the INTA to INTD output pins in the 16 mode, or on wire-OR IRQ output pin in the 68 mode. Table 10. Bit 7:4 3 Interrupt Enable Register bits description Description Reserved; set to `0'. Modem status interrupt. logic 0 = disable the modem status register interrupt (normal default condition) logic 1 = enable the modem status register interrupt 2 IER[2] Receive line status interrupt. logic 0 = disable the receiver line status interrupt (normal default condition) logic 1 = enable the receiver line status interrupt 1 IER[1] Transmit Holding Register interrupt. This interrupt will be issued whenever the THR is empty, and is associated with LSR[1]. logic 0 = disable the transmitter empty interrupt (normal default condition) logic 1 = enable the transmitter empty interrupt 0 IER[0] Receive Holding Register interrupt. This interrupt will be issued when the FIFO has reached the programmed trigger level, or is cleared when the FIFO drops below the trigger level in the FIFO mode of operation. logic 0 = disable the receiver ready interrupt (normal default condition) logic 1 = enable the receiver ready interrupt Symbol IER[7:4] IER[3] SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 28 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 7.2.1 IER versus Receive FIFO interrupt mode operation When the receive FIFO (FCR[0] = logic 1), and receive interrupts (IER[0] = logic 1) are enabled, the receive interrupts and register status will reflect the following: * The receive data available interrupts are issued to the external CPU when the FIFO has reached the programmed trigger level. It will be cleared when the FIFO drops below the programmed trigger level. * FIFO status will also be reflected in the user accessible ISR register when the FIFO trigger level is reached. Both the ISR register status bit and the interrupt will be cleared when the FIFO drops below the trigger level. * The data ready bit (LSR[0]) is set as soon as a character is transferred from the shift register to the receive FIFO. It is reset when the FIFO is empty. 7.2.2 IER versus Receive/Transmit FIFO polled mode operation When FCR[0] = logic 1, resetting IER[3:0] enables the SC16C554B/554DB in the FIFO polled mode of operation. Since the receiver and transmitter have separate bits in the LSR, either or both can be used in the polled mode by selecting respective transmit or receive control bit(s). * * * * LSR[0] will be a logic 1 as long as there is one byte in the receive FIFO. LSR[4:1] will provide the type of errors encountered, if any. LSR[5] will indicate when the transmit FIFO is empty. LSR[6] will indicate when both the transmit FIFO and Transmit Shift Register are empty. * LSR[7] will indicate any FIFO data errors. 7.3 FIFO Control Register (FCR) This register is used to enable the FIFOs, clear the FIFOs, set the receive FIFO trigger levels, and select the DMA mode. 7.3.1 DMA mode 7.3.1.1 Mode 0 (FCR bit 3 = 0) Set and enable the interrupt for each single transmit or receive operation, and is similar to the 16C454 mode. Transmit Ready (TXRDY) will go to a logic 0 whenever an empty transmit space is available in the Transmit Holding Register (THR). Receive Ready (RXRDY) will go to a logic 0 whenever the Receive Holding Register (RHR) is loaded with a character. 7.3.1.2 Mode 1 (FCR bit 3 = 1) Set and enable the interrupt in a block mode operation. The transmit interrupt is set when there are one or more FIFO locations empty. The receive interrupt is set when the receive FIFO fills to the programmed trigger level. However, the FIFO continues to fill regardless of the programmed level until the FIFO is full. RXRDY remains a logic 0 as long as the FIFO fill level is above the programmed trigger level. SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 29 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 7.3.2 FIFO mode Table 11. Bit 7:6 FIFO Control Register bits description Symbol FCR[7:6] Description RCVR trigger. These bits are used to set the trigger level for the receive FIFO interrupt. An interrupt is generated when the number of characters in the FIFO equals the programmed trigger level. However, the FIFO will continue to be loaded until it is full. Refer to Table 12. 5:4 3 FCR[5:4] FCR[3] not used; initialized to logic 0 DMA mode select. logic 0 = set DMA mode `0' (normal default condition) logic 1 = set DMA mode `1' Transmit operation in mode `0': When the SC16C554B/554DB is in the 16C450 mode (FIFOs disabled; FCR[0] = logic 0) or in the FIFO mode (FIFOs enabled; FCR[0] = logic 1; FCR[3] = logic 0), and when there are no characters in the transmit FIFO or Transmit Holding Register, the TXRDY pin will be a logic 0. Once active, the TXRDY pin will go to a logic 1 after the first character is loaded into the Transmit Holding Register. Receive operation in mode `0': When the SC16C554B/554DB is in mode `0' (FCR[0] = logic 0), or in the FIFO mode (FCR[0] = logic 1; FCR[3] = logic 0) and there is at least one character in the receive FIFO, the RXRDY pin will be a logic 0. Once active, the RXRDY pin will go to a logic 1 when there are no more characters in the receiver. Transmit operation in mode `1': When the SC16C554B/554DB is in FIFO mode (FCR[0] = logic 1; FCR[3] = logic 1), the TXRDY pin will be a logic 1 when the transmit FIFO is completely full. It will be a logic 0 if one or more FIFO locations are empty. Receive operation in mode `1': When the SC16C554B/554DB is in FIFO mode (FCR[0] = logic 1; FCR[3] = logic 1) and the trigger level has been reached, or a Receive Time-out has occurred, the RXRDY pin will go to a logic 0. Once activated, it will go to a logic 1 after there are no more characters in the FIFO. 2 FCR[2] XMIT FIFO reset. logic 0 = no FIFO transmit reset (normal default condition) logic 1 = clears the contents of the transmit FIFO and resets the FIFO counter logic (the Transmit Shift Register is not cleared or altered). This bit will return to a logic 0 after clearing the FIFO. 1 FCR[1] RCVR FIFO reset. logic 0 = no FIFO receive reset (normal default condition) logic 1 = clears the contents of the receive FIFO and resets the FIFO counter logic (the Receive Shift Register is not cleared or altered). This bit will return to a logic 0 after clearing the FIFO. 0 FCR[0] FIFO enable. logic 0 = disable the transmit and receive FIFO (normal default condition) logic 1 = enable the transmit and receive FIFO. This bit must be a 1 when other FCR bits are written to, or they will not be programmed. SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 30 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs RCVR trigger levels FCR[6] 0 1 0 1 RX FIFO trigger level 1 4 8 14 Table 12. FCR[7] 0 0 1 1 7.4 Interrupt Status Register (ISR) The SC16C554B/554DB provides four levels of prioritized interrupts to minimize external software interaction. The Interrupt Status Register (ISR) provides the user with four interrupt status bits. Performing a read cycle on the ISR will provide the user with the highest pending interrupt level to be serviced. No other interrupts are acknowledged until the pending interrupt is serviced. Whenever the Interrupt Status Register is read, the interrupt status is cleared. However, it should be noted that only the current pending interrupt is cleared by the read. A lower level interrupt may be seen after re-reading the interrupt status bits. Table 13 "Interrupt source" shows the data values (bits 0 to 5) for the four prioritized interrupt levels and the interrupt sources associated with each of these interrupt levels. Table 13. Interrupt source Priority ISR[5] ISR[4] ISR[3] ISR[2] ISR[1] ISR[0] Source of the interrupt level 1 2 2 3 4 Table 14. Bit 7:6 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 1 0 0 1 0 0 1 0 0 0 0 0 0 LSR (Receiver Line Status Register) RXRDY (Receive Data Ready) RXRDY (Receive Data time-out) TXRDY (Transmitter Holding Register Empty) MSR (Modem Status Register) Interrupt Status Register bits description Symbol ISR[7:6] Description FIFOs enabled. These bits are set to a logic 0 when the FIFO is not being used. They are set to a logic 1 when the FIFOs are enabled. logic 0 or cleared = default condition Reserved; set to 0. INT priority bits 2 to 0. These bits indicate the source for a pending interrupt at interrupt priority levels 1, 2, and 3 (see Table 13). logic 0 or cleared = default condition INT status. logic 0 = an interrupt is pending and the ISR contents may be used as a pointer to the appropriate interrupt service routine logic 1 = no interrupt pending (normal default condition) 5:4 3:1 ISR[5:4] ISR[3:1] 0 ISR[0] SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 31 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 7.5 Line Control Register (LCR) The Line Control Register is used to specify the asynchronous data communication format. The word length, the number of stop bits, and the parity are selected by writing the appropriate bits in this register. Table 15. Bit 7 Line Control Register bits description Description Divisor latch enable. The internal baud rate counter latch and Enhance Feature mode enable. logic 0 = divisor latch disabled (normal default condition) logic 1 = divisor latch enabled 6 LCR[6] Set break. When enabled, the Break control bit causes a break condition to be transmitted (the TX output is forced to a logic 0 state). This condition exists until disabled by setting LCR[6] to a logic 0. logic 0 = no TX break condition (normal default condition) logic 1 = forces the transmitter output (TX) to a logic 0 for alerting the remote receiver to a line break condition 5 LCR[5] Set parity. If the parity bit is enabled, LCR[5] selects the forced parity format. Programs the parity conditions (see Table 16). logic 0 = parity is not forced (normal default condition) LCR[5] = logic 1 and LCR[4] = logic 0: parity bit is forced to a logic 1 for the transmit and receive data LCR[5] = logic 1 and LCR[4] = logic 1: parity bit is forced to a logic 0 for the transmit and receive data 4 LCR[4] Even parity. If the parity bit is enabled with LCR[3] set to a logic 1, LCR[4] selects the even or odd parity format. logic 0 = odd parity is generated by forcing an odd number of logic 1s in the transmitted data. The receiver must be programmed to check the same format (normal default condition). logic 1 = even parity is generated by forcing an even number of logic 1s in the transmitted data. The receiver must be programmed to check the same format. 3 LCR[3] Parity enable. Parity or no parity can be selected via this bit. logic 0 = no parity (normal default condition) logic 1 = a parity bit is generated during the transmission, receiver checks the data and parity for transmission errors 2 LCR[2] Stop bits. The length of stop bit is specified by this bit in conjunction with the programmed word length (see Table 17). logic 0 or cleared = default condition 1:0 LCR[1:0] Word length bits 1, 0. These two bits specify the word length to be transmitted or received (see Table 18). logic 0 or cleared = default condition Symbol LCR[7] SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 32 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs LCR[5] parity selection LCR[4] X 0 1 0 1 LCR[3] 0 1 1 1 1 Parity selection no parity odd parity even parity forced parity `1' forced parity `0' Table 16. LCR[5] X 0 0 1 1 Table 17. LCR[2] 0 1 1 Table 18. LCR[1] 0 0 1 1 LCR[2] stop bit length Word length (bits) 5, 6, 7, 8 5 6, 7, 8 LCR[1:0] word length LCR[0] 0 1 0 1 Word length (bits) 5 6 7 8 Stop bit length (bit times) 1 112 2 SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 33 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 7.6 Modem Control Register (MCR) This register controls the interface with the modem or a peripheral device. Table 19. Bit 7:6 5 4 Modem Control Register bits description Symbol MCR[7:6] MCR[5] MCR[4] Description Reserved; set to `0'. Autoflow control enable. Loopback. Enable the local Loopback mode (diagnostics). In this mode the transmitter output (TXn) and the receiver input (RXn), CTS, DSR, CD, and RI are disconnected from the SC16C554B/554DB I/O pins. Internally the modem data and control pins are connected into a loopback data configuration (see Figure 14). In this mode, the receiver and transmitter interrupts remain fully operational. The Modem Control Interrupts are also operational, but the interrupts' sources are switched to the lower four bits of the Modem Control. Interrupts continue to be controlled by the IER register. logic 0 = disable Loopback mode (normal default condition) logic 1 = enable local Loopback mode (diagnostics) 3 MCR[3] OP2, INTn enable. Used to control the modem CD signal in the Loopback mode. logic 0 = forces INTA to INTD outputs to the 3-state mode during the 16 mode (normal default condition). In the Loopback mode, sets OP2 (CD) internally to a logic 1. logic 1 = forces the INTA to INTD outputs to the active mode during the 16 mode. In the Loopback mode, sets OP2 (CD) internally to a logic 0. 2 1 MCR[2] MCR[1] OP1. This bit is used in the Loopback mode only. In the Loopback mode, this bit is used to write the state of the modem RI interface signal via OP1. RTS logic 0 = force RTS output to a logic 1 (normal default condition) logic 1 = force RTS output to a logic 0 Automatic RTS may be used for hardware flow control by enabling MCR[5]. 0 MCR[0] DTR logic 0 = force DTR output to a logic 1 (normal default condition) logic 1 = force DTR output to a logic 0 SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 34 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 7.7 Line Status Register (LSR) This register provides the status of data transfers between the SC16C554B/554DB and the CPU. Table 20. Bit 7 Line Status Register bits description Description FIFO data error. logic 0 = no error (normal default condition) logic 1 = at least one parity error, framing error or break indication is in the current FIFO data. This bit is cleared when LSR register is read. 6 LSR[6] THR and TSR empty. This bit is the Transmit Empty indicator. This bit is set to a logic 1 whenever the Transmit Holding Register and the Transmit Shift Register are both empty. It is reset to logic 0 whenever either the THR or TSR contains a data character. In the FIFO mode, this bit is set to logic 1 whenever the transmit FIFO and Transmit Shift Register are both empty. THR empty. This bit is the Transmit Holding Register Empty indicator. This bit indicates that the UART is ready to accept a new character for transmission. In addition, this bit causes the UART to issue an interrupt to CPU when the THR interrupt enable is set. The THR bit is set to a logic 1 when a character is transferred from the Transmit Holding Register into the Transmitter Shift Register. The bit is reset to a logic 0 concurrently with the loading of the transmitter holding register by the CPU. In the FIFO mode, this bit is set when the transmit FIFO is empty; it is cleared when at least 1 byte is written to the transmit FIFO. Break interrupt. logic 0 = no break condition (normal default condition) logic 1 = the receiver received a break signal (RX was a logic 0 for one character frame time). In the FIFO mode, only one break character is loaded into the FIFO. 3 LSR[3] Framing error. logic 0 = no framing error (normal default condition) logic 1 = framing error. The receive character did not have a valid stop bit(s). In the FIFO mode, this error is associated with the character at the top of the FIFO. 2 LSR[2] Parity error. logic 0 = no parity error (normal default condition) logic 1 = parity error. The receive character does not have correct parity information and is suspect. In the FIFO mode, this error is associated with the character at the top of the FIFO. 1 LSR[1] Overrun error. logic 0 = no overrun error (normal default condition) logic 1 = overrun error. A data overrun error occurred in the Receive Shift Register. This happens when additional data arrives while the FIFO is full. In this case, the previous data in the shift register is overwritten. Note that under this condition, the data byte in the Receive Shift Register is not transferred into the FIFO, therefore the data in the FIFO is not corrupted by the error. 0 LSR[0] Receive data ready. logic 0 = no data in Receive Holding Register or FIFO (normal default condition) logic 1 = data has been received and is saved in the Receive Holding Register or FIFO SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Symbol LSR[7] 5 LSR[5] 4 LSR[4] Product data sheet Rev. 4 -- 8 June 2010 35 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 7.8 Modem Status Register (MSR) This register provides the current state of the control interface signals from the modem, or other peripheral device to which the SC16C554B/554DB is connected. Four bits of this register are used to indicate the changed information. These bits are set to a logic 1 whenever a control input from the modem changes state. These bits are set to a logic 0 whenever the CPU reads this register. Table 21. Bit 7 Modem Status Register bits description Description CD (active HIGH, logic 1). Normally this bit is the complement of the CD input. In the Loopback mode this bit is equivalent to the OP2 bit in the MCR register. RI (active HIGH, logic 1). Normally this bit is the complement of the RI input. In the Loopback mode this bit is equivalent to the OP1 bit in the MCR register. DSR (active HIGH, logic 1). Normally this bit is the complement of the DSR input. In Loopback mode this bit is equivalent to the DTR bit in the MCR register. CTS (active HIGH, logic 1). CTS functions as hardware flow control signal input if it is enabled via MCR[5]. Flow control (when enabled) allows starting and stopping the transmissions based on the external modem CTS signal. A logic 1 at the CTS pin will stop SC16C554B/554DB transmissions as soon as current character has finished transmission. Normally MSR[4] is the complement of the CTS input. However, in the Loopback mode, this bit is equivalent to the RTS bit in the MCR register. CD [1] Logic 0 = No CD change (normal default condition). Logic 1 = The CD input to the SC16C554B/554DB has changed state since the last time it was read. A modem Status Interrupt will be generated. 2 MSR[2] RI [1] Logic 0 = No RI change (normal default condition). Logic 1 = The RI input to the SC16C554B/554DB has changed from a logic 0 to a logic 1. A modem Status Interrupt will be generated. 1 MSR[1] DSR [1] Logic 0 = No DSR change (normal default condition). Logic 1 = The DSR input to the SC16C554B/554DB has changed state since the last time it was read. A modem Status Interrupt will be generated. 0 MSR[0] CTS [1] Logic 0 = No CTS change (normal default condition). Logic 1 = The CTS input to the SC16C554B/554DB has changed state since the last time it was read. A modem Status Interrupt will be generated. [1] Whenever any MSR[3:0] is set to logic 1, a Modem Status Interrupt will be generated. Symbol MSR[7] 6 MSR[6] 5 MSR[5] 4 MSR[4] 3 MSR[3] SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 36 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 7.9 Scratchpad Register (SPR) The SC16C554B/554DB provides a temporary data register to store 8 bits of user information. 7.10 SC16C554B/554DB external reset conditions Table 22. Register IER ISR LCR MCR LSR MSR FCR Table 23. Output TXA, TXB, TXC, TXD RTSA, RTSB, RTSC, RTSD DTRA, DTRB, DTRC, DTRD RXRDY TXRDY Reset state for registers Reset state IER[7:0] = 0 ISR[7:1] = 0; ISR[0] = 1 LCR[7:0] = 0 MCR[7:0] = 0 LSR[7] = 0; LSR[6:5] = 1; LSR[4:0] = 0 MSR[7:4] = input signals; MSR[3:0] = 0 FCR[7:0] = 0 Reset state for outputs Reset state HIGH HIGH HIGH HIGH LOW 8. Limiting values Table 24. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol VCC Vn Tamb Tstg Ptot/pack Parameter supply voltage voltage on any other pin ambient temperature storage temperature total power dissipation per package at D7 to D0 at any input only pin Conditions Min GND - 0.3 GND - 0.3 -40 -65 Max 7 VCC + 0.3 5.3 +85 +150 500 Unit V V V C C mW SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 37 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 9. Static characteristics Table 25. Static characteristics Tamb = -40 C to +85 C; tolerance of VCC = 10 %, unless otherwise specified. Symbol VIL(clk) VIH(clk) VIL VIH VOL Parameter clock LOW-level input voltage clock HIGH-level input voltage LOW-level input voltage HIGH-level input voltage LOW-level output voltage except XTAL1 clock except XTAL1 clock on all outputs IOL = 5 mA (data bus) IOL = 4 mA (other outputs) IOL = 2 mA (data bus) IOL = 1.6 mA (other outputs) VOH HIGH-level output voltage IOH = -5 mA (data bus) IOH = -1 mA (other outputs) IOH = -800 A (data bus) IOH = -400 A (other outputs) ILIL IL(clk) ICC Ci Rpu(int) [1] [2] [1] Conditions VCC = 2.5 V Min -0.3 1.8 -0.3 1.6 1.85 1.85 Max +0.45 VCC +0.65 0.4 0.4 10 30 4.5 5 - VCC = 3.3 V Min -0.3 2.4 -0.3 2.0 2.0 500 Max +0.6 VCC +0.8 0.4 10 30 6 5 - VCC = 5.0 V Min -0.5 3.0 -0.5 2.2 2.4 500 Max +0.6 VCC +0.8 0.4 10 30 6 5 - Unit V V V V V V V V V V V V A A mA pF k LOW-level input leakage current clock leakage current supply current input capacitance internal pull-up resistance [2] f = 5 MHz 500 Except XTAL2, VOL = 1 V typical. Refer to Table 2 "Pin description" for a listing of pins having internal pull-up resistors. SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 38 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 10. Dynamic characteristics Table 26. Dynamic characteristics Tamb = -40 C to +85 C; tolerance of VCC 10 %, unless otherwise specified. Symbol Parameter tWH tWL fXTAL t6s t6h t7d t7w t7h t9d t12d t12h t13d t13w t13h t15d t16s t16h t17d t18d t19d t20d t21d t22d t23d t24d t25d t26d pulse width HIGH pulse width LOW oscillator/clock frequency address set-up time address hold time IOR delay from chip select IOR strobe width chip select hold time from IOR read cycle delay delay from IOR to data data disable time IOW delay from chip select IOW strobe width chip select hold time from IOW write cycle delay data set-up time data hold time delay from IOW to output 25 pF load delay to set interrupt from 25 pF load modem input delay to reset interrupt from IOR delay from stop to set interrupt delay from IOR to reset interrupt delay from start to set interrupt delay from IOW to transmit start delay from IOW to reset interrupt delay from stop to set RXRDY delay from IOR to reset RXRDY 25 pF load 25 pF load 25 pF load 25 pF load 25 pF load 25 pF load [1][2] Conditions VCC = 2.5 V Min 10 10 0 0 10 77 0 20 10 20 0 25 20 15 Max 48 77 15 100 100 100 1TRCLK [3] VCC = 3.3 V Min 6 6 0 0 10 26 0 20 10 20 0 25 20 5 Max 80 26 15 33 24 24 1TRCLK [3] VCC = 5.0 V Min 6 6 0 0 10 23 0 20 10 15 0 20 15 5 8TRCLK [3] Unit ns ns MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns Max 80 23 15 29 23 23 1TRCLK [3] 100 100 29 45 24TRCLK [3] 28 40 8TRCLK 24TRCLK 8TRCLK [3] [3] [3] 24TRCLK ns [3] - 100 1TRCLK [3] - 45 1TRCLK [3] - 40 1TRCLK [3] ns ns ns 100 45 40 SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 39 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs Table 26. Dynamic characteristics ...continued Tamb = -40 C to +85 C; tolerance of VCC 10 %, unless otherwise specified. Symbol Parameter t27d t28d t30s t30w t30h t30d t31d t31h t32s t32h t32d t33s t33h tRESET N [1] [2] [3] [4] Conditions VCC = 2.5 V Min Max 100 8TRCLK [3] VCC = 3.3 V Min 10 26 15 20 10 10 25 15 5 40 1 Max 45 8TRCLK [3] VCC = 5.0 V Min 10 23 15 20 10 10 20 15 5 40 1 Max 40 8TRCLK [3] Unit ns ns ns ns ns ns ns ns ns ns ns ns ns ns delay from IOW to set TXRDY delay from start to reset TXRDY address set-up time chip select strobe width address hold time read cycle delay delay from CS to data data disable time write strobe set-up time write strobe hold time write cycle delay data set-up time data hold time RESET pulse width baud rate divisor Applies to external clock, crystal oscillator max 24 MHz. [4] 10 25 pF load 25 pF load 25 pF load 25 pF load [1] 90 15 (216 - 1) 26 15 (216 - 1) 23 15 (216 - 1) 90 15 20 10 10 25 20 15 200 1 Maximum frequency = -------------RCLK is an internal signal derived from Divisor Latch LSB (DLL) and Divisor Latch MSB (DLM) divisor latches. Reset pulse must happen when these signals are inactive: CSA, CSB, CSC, CSD, IOW, IOR. 1 t w ( clk ) 10.1 Timing diagrams A0 to A4 t30s CS t32s t31h t30w t30h t30d R/W t31d D0 to D7 002aaa210 Fig 18. General read timing in 68 mode SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 40 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs A0 to A4 t30s t30w t30h CS t32s t32h t32d R/W t33s t33h D0 to D7 002aaa211 Fig 19. General write timing in 68 mode t6h valid address t6s t13h A0 to A2 CS t13d active t15d t13w active t16s t16h IOW D0 to D7 data 002aaa171 Fig 20. General write timing in 16 mode SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 41 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs t6h valid address t6s t7h A0 to A2 CS t7d active t9d t7w active t12d t12h IOR D0 to D7 data 002aaa172 Fig 21. General read timing in 16 mode IOW active t17d RTSA, RTSB, RTSC, RTSD DTRA, DTRB, DTRC, DTRD change of state change of state CDA, CDB, CDC, CDD CTSA, CTSB, CTSC, CTSD DSRA, DSRB, DSRC, DSRD t18d INTA, INTB, INTC, INTD change of state t18d change of state active t19d active active IOR active active t18d active RIA, RIB, RIC, RID change of state 002aaf555 Fig 22. Modem input/output timing SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 42 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs tWL external clock tWH tw(clk) 002aac357 1 f XTAL = -------------t w ( clk ) Fig 23. External clock timing start bit data bits (0 to 7) D0 D1 D2 D3 D4 D5 D6 D7 parity bit stop bit next data start bit RX 5 data bits 6 data bits 7 data bits INT t20d active t21d active IOR 16 baud rate clock 002aaa113 Fig 24. Receive timing SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 43 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs start bit data bits (0 to 7) D0 D1 D2 D3 D4 D5 D6 D7 parity bit stop bit next data start bit RX t25d RXRDY active data ready t26d IOR active 002aab063 Fig 25. Receive ready timing in non-FIFO mode start bit data bits (0 to 7) D0 D1 D2 D3 D4 D5 D6 D7 parity bit stop bit RX first byte that reaches the trigger level t25d RXRDY active data ready t26d IOR active 002aab064 Fig 26. Receive ready timing in FIFO mode SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 44 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs start bit data bits (0 to 7) D0 D1 D2 D3 D4 D5 D6 D7 parity bit stop bit next data start bit TX 5 data bits 6 data bits 7 data bits INT t22d t23d IOW active active transmitter ready t24d active 16 baud rate clock 002aaa116 Fig 27. Transmit timing start bit data bits (0 to 7) D0 D1 D2 D3 D4 D5 D6 D7 parity bit stop bit next data start bit TX IOW active t28d D0 to D7 byte #1 t27d TXRDY active transmitter ready 002aab062 transmitter not ready Fig 28. Transmit ready timing in non-FIFO mode SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 45 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs start bit data bits (0 to 7) D0 D1 D2 D3 D4 D5 D6 D7 parity bit stop bit TX 5 data bits 6 data bits 7 data bits IOW active t28d D0 to D7 byte #16 t27d TXRDY FIFO full 002aab061 Fig 29. Transmit ready timing in FIFO mode (DMA mode `1') SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 46 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 11. Package outline LQFP64: plastic low profile quad flat package; 64 leads; body 10 x 10 x 1.4 mm SOT314-2 c y X A 48 49 33 32 ZE e E HE wM bp 64 1 pin 1 index 16 ZD bp D HD wM B vM B vM A 17 detail X L Lp A A2 A1 (A 3) e 0 2.5 scale 5 mm DIMENSIONS (mm are the original dimensions) UNIT mm A max. 1.6 A1 0.20 0.05 A2 1.45 1.35 A3 0.25 bp 0.27 0.17 c 0.18 0.12 D (1) 10.1 9.9 E (1) 10.1 9.9 e 0.5 HD HE L 1 Lp 0.75 0.45 v 0.2 w 0.12 y 0.1 Z D (1) Z E (1) 1.45 1.05 1.45 1.05 7o o 0 12.15 12.15 11.85 11.85 Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT314-2 REFERENCES IEC 136E10 JEDEC MS-026 JEITA EUROPEAN PROJECTION ISSUE DATE 00-01-19 03-02-25 Fig 30. Package outline SOT314-2 (LQFP64) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 47 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs LQFP80: plastic low profile quad flat package; 80 leads; body 12 x 12 x 1.4 mm SOT315-1 c y X A 60 61 41 40 Z E e E HE wM bp pin 1 index 80 1 20 ZD bp D HD wM B vM B vM A 21 detail X Lp L A A2 A1 (A 3) e 0 5 scale 10 mm DIMENSIONS (mm are the original dimensions) UNIT mm A max. 1.6 A1 0.16 0.04 A2 1.5 1.3 A3 0.25 bp 0.27 0.13 c 0.18 0.12 D (1) 12.1 11.9 E (1) 12.1 11.9 e 0.5 HD HE L 1 Lp 0.75 0.30 v 0.2 w 0.15 y 0.1 Z D (1) Z E (1) 1.45 1.05 1.45 1.05 7 o 0 o 14.15 14.15 13.85 13.85 Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT315-1 REFERENCES IEC 136E15 JEDEC MS-026 JEITA EUROPEAN PROJECTION ISSUE DATE 00-01-19 03-02-25 Fig 31. Package outline SOT315-1 (LQFP80) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 48 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs LQFP64: plastic low profile quad flat package; 64 leads; body 7 x 7 x 1.4 mm SOT414-1 c y X 48 49 33 32 ZE A e E HE wM pin 1 index bp L 64 1 ZD bp D HD wM B vM B 16 17 detail X Lp A A2 A1 (A 3) e vM A 0 2.5 scale 5 mm DIMENSIONS (mm are the original dimensions) UNIT mm A max. 1.6 A1 0.15 0.05 A2 1.45 1.35 A3 0.25 bp 0.23 0.13 c 0.20 0.09 D (1) 7.1 6.9 E (1) 7.1 6.9 e 0.4 HD 9.15 8.85 HE 9.15 8.85 L 1 Lp 0.75 0.45 v 0.2 w 0.08 y 0.08 Z D (1) Z E (1) 0.64 0.36 0.64 0.36 7 o 0 o Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT414-1 REFERENCES IEC 136E06 JEDEC MS-026 JEITA EUROPEAN PROJECTION ISSUE DATE 00-01-19 03-02-20 Fig 32. Package outline SOT414-1 (LQFP64) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 49 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs HVQFN48: plastic thermal enhanced very thin quad flat package; no leads; 48 terminals; body 6 x 6 x 0.85 mm SOT778-3 D B A terminal 1 index area E A A1 c detail X C e1 e 13 1/2 e b 24 25 v w M M CAB C y1 C y L 12 e Eh 1/2 e e2 1 36 48 37 terminal 1 index area X 0 2.5 scale 5 mm Dh DIMENSIONS (mm are the original dimensions) UNIT mm A(1) max 1 A1 0.05 0.00 b 0.25 0.15 c 0.2 D (1) 6.1 5.9 Dh 3.95 3.65 E (1) 6.1 5.9 Eh 3.95 3.65 e 0.4 e1 4.4 e2 4.4 L 0.5 0.3 v 0.1 w 0.05 y 0.05 y1 0.1 Note 1. Plastic or metal protrusions of 0.075 mm maximum per side are not included OUTLINE VERSION SOT778-3 REFERENCES IEC --JEDEC --JEITA --EUROPEAN PROJECTION ISSUE DATE 04-06-16 04-06-23 Fig 33. Package outline SOT778-3 (HVQFN48) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 50 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs PLCC68: plastic leaded chip carrier; 68 leads SOT188-2 eD y 60 61 X 44 43 Z E A eE bp b1 wM 68 1 pin 1 index e E HE A A4 A1 (A 3) Lp detail X k 9 27 10 e D HD 26 ZD B vM A vMB 0 5 scale 10 mm DIMENSIONS (mm dimensions are derived from the original inch dimensions) A4 A1 UNIT A D(1) E(1) e HD A3 eD eE bp b1 max. min. mm inches 4.57 4.19 0.51 0.25 0.01 3.3 0.13 0.53 0.33 0.81 0.66 HE k Lp 1.44 1.02 v 0.18 w 0.18 y 0.1 ZD(1) ZE(1) max. max. 2.16 2.16 23.62 23.62 25.27 25.27 1.22 24.33 24.33 1.27 22.61 22.61 25.02 25.02 1.07 24.13 24.13 0.93 0.89 0.93 0.89 45 o 0.180 0.02 0.165 0.021 0.032 0.958 0.958 0.05 0.013 0.026 0.950 0.950 0.995 0.995 0.048 0.057 0.007 0.007 0.004 0.085 0.085 0.985 0.985 0.042 0.040 Note 1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. OUTLINE VERSION SOT188-2 REFERENCES IEC 112E10 JEDEC MS-018 JEITA EDR-7319 EUROPEAN PROJECTION ISSUE DATE 99-12-27 01-11-14 Fig 34. Package outline SOT188-2 (PLCC68) SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 51 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 12. Soldering of SMD packages This text provides a very brief insight into a complex technology. A more in-depth account of soldering ICs can be found in Application Note AN10365 "Surface mount reflow soldering description". 12.1 Introduction to soldering Soldering is one of the most common methods through which packages are attached to Printed Circuit Boards (PCBs), to form electrical circuits. The soldered joint provides both the mechanical and the electrical connection. There is no single soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and Surface Mount Devices (SMDs) are mixed on one printed wiring board; however, it is not suitable for fine pitch SMDs. Reflow soldering is ideal for the small pitches and high densities that come with increased miniaturization. 12.2 Wave and reflow soldering Wave soldering is a joining technology in which the joints are made by solder coming from a standing wave of liquid solder. The wave soldering process is suitable for the following: * Through-hole components * Leaded or leadless SMDs, which are glued to the surface of the printed circuit board Not all SMDs can be wave soldered. Packages with solder balls, and some leadless packages which have solder lands underneath the body, cannot be wave soldered. Also, leaded SMDs with leads having a pitch smaller than ~0.6 mm cannot be wave soldered, due to an increased probability of bridging. The reflow soldering process involves applying solder paste to a board, followed by component placement and exposure to a temperature profile. Leaded packages, packages with solder balls, and leadless packages are all reflow solderable. Key characteristics in both wave and reflow soldering are: * * * * * * Board specifications, including the board finish, solder masks and vias Package footprints, including solder thieves and orientation The moisture sensitivity level of the packages Package placement Inspection and repair Lead-free soldering versus SnPb soldering 12.3 Wave soldering Key characteristics in wave soldering are: * Process issues, such as application of adhesive and flux, clinching of leads, board transport, the solder wave parameters, and the time during which components are exposed to the wave * Solder bath specifications, including temperature and impurities SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 52 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 12.4 Reflow soldering Key characteristics in reflow soldering are: * Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to higher minimum peak temperatures (see Figure 35) than a SnPb process, thus reducing the process window * Solder paste printing issues including smearing, release, and adjusting the process window for a mix of large and small components on one board * Reflow temperature profile; this profile includes preheat, reflow (in which the board is heated to the peak temperature) and cooling down. It is imperative that the peak temperature is high enough for the solder to make reliable solder joints (a solder paste characteristic). In addition, the peak temperature must be low enough that the packages and/or boards are not damaged. The peak temperature of the package depends on package thickness and volume and is classified in accordance with Table 27 and 28 Table 27. SnPb eutectic process (from J-STD-020C) Package reflow temperature (C) Volume (mm3) < 350 < 2.5 2.5 Table 28. 235 220 Lead-free process (from J-STD-020C) Package reflow temperature (C) Volume (mm3) < 350 < 1.6 1.6 to 2.5 > 2.5 260 260 250 350 to 2000 260 250 245 > 2000 260 245 245 350 220 220 Package thickness (mm) Package thickness (mm) Moisture sensitivity precautions, as indicated on the packing, must be respected at all times. Studies have shown that small packages reach higher temperatures during reflow soldering, see Figure 35. SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 53 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs temperature maximum peak temperature = MSL limit, damage level minimum peak temperature = minimum soldering temperature peak temperature time 001aac844 MSL: Moisture Sensitivity Level Fig 35. Temperature profiles for large and small components For further information on temperature profiles, refer to Application Note AN10365 "Surface mount reflow soldering description". 13. Abbreviations Table 29. Acronym CMOS CPU DMA FIFO I/O ISDN LSB MSB PCB QUART TTL UART Abbreviations Description Complementary Metal-Oxide Semiconductor Central Processing Unit Direct Memory Access First In, First Out Input/Output Integrated Service Digital Network Least Significant Bit Most Significant Bit Printed-Circuit Board 4-channel (Quad) Universal Asynchronous Receiver and Transmitter Transistor-Transistor Logic Universal Asynchronous Receiver and Transmitter SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 54 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 14. Revision history Table 30. Revision history Release date Data sheet status Product data sheet Supersedes SC16C554B_554DB_3 Document ID Modifications: SC16C554B_554DB v.4 20100608 * * * * * The format of this data sheet has been redesigned to comply with the new identity guidelines of NXP Semiconductors. Legal texts have been adapted to the new company name where appropriate. Section 2 "Features and benefits": 7th bullet item changed from "5 V tolerant inputs" to "5 V tolerant on input pins only"; added Footnote 1. Figure 9 "Autoflow control (auto-RTS and auto-CTS) example" updated Table 24 "Limiting values": - parameter description for symbol Vn changed from "voltage at any pin" to "voltage on any other pin"; added separate conditions for "at D7 to D0" and "at any input only pin" - symbol for `total power dissipation per package" changed from "Ptot(pack)" to "Ptot/pack" * Table 25 "Static characteristics": - symbol "VIL(CK)" changed to "VIL(clk)" - symbol "VIH(CK)" changed to "VIH(clk)" - parameter description for VOL: moved "on all outputs" to Conditions column - symbol/parameter "ICL, clock leakage" changed to "IL(clk), clock leakage current" - deleted (empty) Typ columns * Table 26 "Dynamic characteristics": - symbol "t1w, t2w, clock pulse duration" is split to two symbols/parameters: "tWH, pulse width HIGH" and "tWL, pulse width LOW" - Table note [2]: fraction's denominator changed from "t3w" to "tw(clk)" - added Table note [4] and its reference at tRESET * Figure 23 "External clock timing": - symbol changed from "t2w" to "tWL" - symbol changed from "t1w" to "tWH" - symbol changed from "t3w" to "tw(clk)" * SC16C554B_554DB_3 SC16C554B_554DB_2 (9397 750 14966) SC16C554B_554DB_1 (9397 750 13133) updated soldering information Product data sheet Product data sheet Product data sheet SC16C554B_554DB_2 SC16C554B_554DB_1 - 20050901 20050613 20050209 SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 55 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 15. Legal information 15.1 Data sheet status Document status[1][2] Objective [short] data sheet Preliminary [short] data sheet Product [short] data sheet [1] [2] [3] Product status[3] Development Qualification Production Definition This document contains data from the objective specification for product development. This document contains data from the preliminary specification. This document contains the product specification. Please consult the most recently issued document before initiating or completing a design. The term `short data sheet' is explained in section "Definitions". The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status information is available on the Internet at URL http://www.nxp.com. 15.2 Definitions Draft -- The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications or additions. NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. Short data sheet -- A short data sheet is an extract from a full data sheet with the same product type number(s) and title. A short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. For detailed and full information see the relevant full data sheet, which is available on request via the local NXP Semiconductors sales office. In case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. Product specification -- The information and data provided in a Product data sheet shall define the specification of the product as agreed between NXP Semiconductors and its customer, unless NXP Semiconductors and customer have explicitly agreed otherwise in writing. In no event however, shall an agreement be valid in which the NXP Semiconductors product is deemed to offer functions and qualities beyond those described in the Product data sheet. malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. NXP Semiconductors accepts no liability for inclusion and/or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer's own risk. Applications -- Applications that are described herein for any of these products are for illustrative purposes only. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products, and NXP Semiconductors accepts no liability for any assistance with applications or customer product design. It is customer's sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer's applications and products planned, as well as for the planned application and use of customer's third party customer(s). Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. NXP Semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer's applications or products, or the application or use by customer's third party customer(s). Customer is responsible for doing all necessary testing for the customer's applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer's third party customer(s). NXP does not accept any liability in this respect. Limiting values -- Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the device. Limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the Recommended operating conditions section (if present) or the Characteristics sections of this document is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. Terms and conditions of commercial sale -- NXP Semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms, unless otherwise agreed in a valid written individual agreement. In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. NXP Semiconductors hereby expressly objects to applying the customer's general terms and conditions with regard to the purchase of NXP Semiconductors products by customer. No offer to sell or license -- Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. Export control -- This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from national authorities. (c) NXP B.V. 2010. All rights reserved. 15.3 Disclaimers Limited warranty and liability -- Information in this document is believed to be accurate and reliable. However, NXP Semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. In no event shall NXP Semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. Notwithstanding any damages that customer might incur for any reason whatsoever, NXP Semiconductors' aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of NXP Semiconductors. Right to make changes -- NXP Semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof. Suitability for use -- NXP Semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or SC16C554B_554DB All information provided in this document is subject to legal disclaimers. Product data sheet Rev. 4 -- 8 June 2010 56 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs NXP Semiconductors' specifications such use shall be solely at customer's own risk, and (c) customer fully indemnifies NXP Semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NXP Semiconductors' standard warranty and NXP Semiconductors' product specifications. Non-automotive qualified products -- Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use. It is neither qualified nor tested in accordance with automotive testing or application requirements. NXP Semiconductors accepts no liability for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without NXP Semiconductors' warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the product for automotive applications beyond 15.4 Trademarks Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. 16. Contact information For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com SC16C554B_554DB All information provided in this document is subject to legal disclaimers. (c) NXP B.V. 2010. All rights reserved. Product data sheet Rev. 4 -- 8 June 2010 57 of 58 NXP Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs 17. Contents 1 2 3 4 5 5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.2 6 6.1 6.1.1 6.1.2 6.2 6.3 6.4 6.4.1 6.4.2 6.4.3 6.4.4 6.5 6.6 6.7 6.8 7 7.1 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 Ordering information . . . . . . . . . . . . . . . . . . . . . 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pinning information . . . . . . . . . . . . . . . . . . . . . . 5 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 PLCC68 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 LQFP64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 LQFP80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 HVQFN48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Pin description . . . . . . . . . . . . . . . . . . . . . . . . 10 Functional description . . . . . . . . . . . . . . . . . . 15 Interface options . . . . . . . . . . . . . . . . . . . . . . . 16 The 16 mode interface . . . . . . . . . . . . . . . . . . 16 The 68 mode interface . . . . . . . . . . . . . . . . . . 16 Internal registers . . . . . . . . . . . . . . . . . . . . . . . 17 FIFO operation . . . . . . . . . . . . . . . . . . . . . . . . 17 Autoflow control (see Figure 9). . . . . . . . . . . . 18 Auto-RTS (see Figure 9). . . . . . . . . . . . . . . . . 18 Auto-CTS (see Figure 9) . . . . . . . . . . . . . . . . 18 Enabling autoflow control and auto-CTS . . . . 19 Auto-CTS and auto-RTS functional timing . . . 19 Hardware/software and time-out interrupts. . . 20 Programmable baud rate generator . . . . . . . . 20 DMA operation . . . . . . . . . . . . . . . . . . . . . . . . 22 Loopback mode . . . . . . . . . . . . . . . . . . . . . . . 22 Register descriptions . . . . . . . . . . . . . . . . . . . 27 Transmit Holding Register (THR) and Receive Holding Register (RHR) . . . . . . . . . . 28 7.2 Interrupt Enable Register (IER) . . . . . . . . . . . 28 7.2.1 IER versus Receive FIFO interrupt mode operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 7.2.2 IER versus Receive/Transmit FIFO polled mode operation . . . . . . . . . . . . . . . . . . 29 7.3 FIFO Control Register (FCR) . . . . . . . . . . . . . 29 7.3.1 DMA mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 7.3.1.1 Mode 0 (FCR bit 3 = 0) . . . . . . . . . . . . . . . . . . 29 7.3.1.2 Mode 1 (FCR bit 3 = 1) . . . . . . . . . . . . . . . . . . 29 7.3.2 FIFO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 7.4 Interrupt Status Register (ISR) . . . . . . . . . . . . 31 7.5 Line Control Register (LCR) . . . . . . . . . . . . . . 32 7.6 Modem Control Register (MCR) . . . . . . . . . . . 34 7.7 Line Status Register (LSR) . . . . . . . . . . . . . . . 35 7.8 Modem Status Register (MSR) . . . . . . . . . . . . 36 7.9 Scratchpad Register (SPR) . . . . . . . . . . . . . . 37 7.10 SC16C554B/554DB external reset conditions 37 8 9 10 10.1 11 12 12.1 12.2 12.3 12.4 13 14 15 15.1 15.2 15.3 15.4 16 17 Limiting values . . . . . . . . . . . . . . . . . . . . . . . . Static characteristics . . . . . . . . . . . . . . . . . . . Dynamic characteristics. . . . . . . . . . . . . . . . . Timing diagrams. . . . . . . . . . . . . . . . . . . . . . . Package outline. . . . . . . . . . . . . . . . . . . . . . . . Soldering of SMD packages . . . . . . . . . . . . . . Introduction to soldering. . . . . . . . . . . . . . . . . Wave and reflow soldering. . . . . . . . . . . . . . . Wave soldering . . . . . . . . . . . . . . . . . . . . . . . Reflow soldering . . . . . . . . . . . . . . . . . . . . . . Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . Revision history . . . . . . . . . . . . . . . . . . . . . . . Legal information . . . . . . . . . . . . . . . . . . . . . . Data sheet status . . . . . . . . . . . . . . . . . . . . . . Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . Contact information . . . . . . . . . . . . . . . . . . . . Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 38 39 40 47 52 52 52 52 53 54 55 56 56 56 56 57 57 58 Please be aware that important notices concerning this document and the product(s) described herein, have been included in section `Legal information'. (c) NXP B.V. 2010. All rights reserved. For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com Date of release: 8 June 2010 Document identifier: SC16C554B_554DB |
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