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1 ? fn6140.1 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | intersil (and design) is a registered trademark of intersil americas inc. copyright intersil americas inc. 2005. all rights reserved all other trademarks mentioned are the property of their respective owners. ms82c55a, mq82c55a cmos programmable peripheral interface the intersil 82c55a is a high performance cmos version of the industry standard 8255a and is manufactured using a self-aligned silicon gate cmos process (scaled saji iv). it is a general purpose programmable i/o device which may be used with many different microprocessors. there are 24 i/o pins which may be individually programmed in two groups of 12 and used in three major modes of operation. the high performance and industry standard configuration of the 82c55a make it compatible with the 80c86, 80c88 and other microprocessors. static cmos circuit design insures low operating power. the intersil advanced saji process results in performance equal to or greater than existing functionally equivalent products at a fraction of the power. features ? pb-free plus anneal available (rohs compliant) (see ordering info) ? pin compatible with oki msm82c55a - no bus hold devices on any port pins ? 24 programmable i/o pins ? fully ttl compatible ? high speed, no ?wait state? operation with 8mhz 80c86 and 80c88 ? direct bit set/reset capability ? enhanced control word read capability ? l7 process ? 2.5ma drive capability on all i/o ports ? low standby power (iccsb) . . . . . . . . . . . . . . . . . . .10 a ordering information part numbers* temp. range (c) package pkg. dwg. # cms82c55az (note) 0 to 70 44 ld plcc (pb-free) n44.65 ims82c55az (note) -40 to 85 cmq82c55az (note) 0 to 70 44 ld mqfp (pb-free) q44.10x10 imq82c55az (note) -40 to 85 *add ?96? suffix to part number for tape and reel packaging. note: intersil pb-free plus anneal products employ special pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish , which are rohs compliant and compatible with both snpb and pb-free soldering operations. intersil pb-free products are msl classi fied at pb-free peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020. data sheet june 28, 2005
2 fn6140.1 june 28, 2005 pinouts ms82c55a (plcc) top view mq82c55a (mqfp) top view cs gnd a1 a0 pc7 pc6 pc5 pc4 pc0 pc1 pc3 pb0 pb1 pb2 pb3 pb4 pb5 pb6 pb7 nc nc reset d0 d1 d2 d3 d4 d5 d6 d7 v cc rd pa0 pa1 pa2 pa3 pa4 pa5 pa6 pa7 wr nc pc2 nc 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 1 2 3 4 5 6 26 25 24 23 22 21 20 19 18 7 8 9 10 11 12 13 14 15 16 17 pc6 pc7 a0 a1 gnd cs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 pc5 pc4 pc0 pc1 pc2 28 27 26 25 24 23 22 21 20 19 18 pb7 v cc d7 d6 d5 d4 39 38 37 36 35 34 33 32 31 30 29 44 43 42 41 40 nc pa4 pa5 pa6 pa7 wr reset d0 d1 d2 d3 rd pa0 pa1 pa2 pa3 nc pb3 pb4 pb5 pb6 nc nc pc3 pb0 pb1 pb2 pin description symbol type description v cc v cc : the +5v power supply pin. a 0.1 f capacitor between v cc and gnd is recommended for decoupling. gnd ground d0-d7 i/o data bus: the data bus lines are bidirectional three-state pins connected to the system data bus. reset i reset: a high on this input clears the control regist er and all ports (a, b, c) are set to the input mode. cs i chip select: chip select is an active low input used to enable the 82c55a onto the data bus for cpu communications. rd i read: read is an active low input control signal used by th e cpu to read status information or data via the data bus. wr i write: write is an active low input c ontrol signal used by the cpu to load control words and data into the 82c55a. a0-a1 i address: these input signal s, in conjunction with the rd and wr inputs, control the selection of one of the three ports or the control word register. a0 and a1 are normally c onnected to the least significant bits of the address bus a0, a1. pa0-pa7 i/o port a: 8-bit input and output port. pb0-pb7 i/o port b: 8-bit input and output port. pc0-pc7 i/o port c: 8-bit input and output port. ms82c55a, mq82c55a
3 fn6140.1 june 28, 2005 functional diagram functional description data bus buffer this three-state bidirectional 8-bit buffer is used to interface the 82c55a to the system data bu s. data is transmitted or received by the buffer upon execution of input or output instructions by the cpu. control words and status information are also transferred through the data bus buffer. read/write an d control logic the function of this block is to manage all of the internal and external transfers of both data and control or status words. it accepts inputs from the cpu address and control busses and in turn, issues commands to both of the control groups. (cs ) chip select. a ?low? on this input pin enables the communication between the 82c55a and the cpu. (rd ) read. a ?low? on this input pin enables 82c55a to send the data or status information to the cpu on the data bus. in essence, it allows the cp u to ?read from? the 82c55a. (wr ) write. a ?low? on this input pin enables the cpu to write data or control words into the 82c55a. (a0 and a1) port select 0 and port select 1. these input signals, in conjunction with the rd and wr inputs, control the selection of one of the three ports or the control word register. they are normally connected to the least significant bits of the address bus (a0 and a1). (reset) reset. a ?high? on this input initializes the control register to 9bh and all ports (a, b, c) are set to the input mode. group a port a (8) group a port c upper (4) group b port c lower (4) group b port b (8) group b control group a control data bus buffer read write control logic rd wr a1 a0 reset cs d7-d0 power supplies +5v gnd bidirectional data bus i/o pa7-pa0 i/o pc7-pc4 i/o pc3-pc0 i/o pb7-pb0 8-bit internal data bus figure 1. functional diagram 82c55a basic operation a1 a0 rd wr cs input operation (read) 00010port a data bus 01010port b data bus 10010port c data bus 11010control word data bus output operation (write) 00100data bus port a 01100data bus port b 10100data bus port c 11100data bus control disable function xxxx1data bus three-state xx110data bus three-state ms82c55a, mq82c55a
4 fn6140.1 june 28, 2005 group a and group b controls the functional configuration of each port is programmed by the systems software. in essence, the cpu ?outputs? a control word to the 82c55a. the control word contains information such as ?mode?, ?bit set?, ?bit reset?, etc., that initializes the functional c onfiguration of the 82c55a. each of the control blocks (group a and group b) accepts ?commands? from the read/write control logic, receives ?control words? from the internal data bus and issues the proper commands to its associated ports. control group a - port a and port c upper (c7 - c4) control group b - port b an d port c lower (c3 - c0) the control word register can be both written and read as shown in the ?basic operation? table. figure 4 shows the control word format for both read and write operations. when the control word is read, bit d7 will always be a logic ?1?, as this implies control word mode information. ports a, b, and c the 82c55a contains three 8-bit ports (a, b, and c). all can be configured to a wide variety of functional characteristics by the system software but each has its own special features or ?personality? to further enhan ce the power and flexibility of the 82c55a. port a one 8-bit data output latch/buffer and one 8-bit data input latch. port b one 8-bit data input/output latch/buffer and one 8-bit data input buffer. port c one 8-bit data output latch/buffer and one 8-bit data input buffer (no latch for input). this port can be divided into two 4-bit ports under the mode control. each 4-bit port contains a 4-bit latch and it ca n be used for the control signal output and status signal inputs in conjunction with ports a and b. operational description mode selection there are three basic modes of operation than can be selected by the system software: mode 0 - basic input/output mode 1 - strobed input/output mode 2 - bidirectional bus when the reset input goes ?high?, all ports will be set to the input mode. after the reset is removed, the 82c55a can remain in the input mode with no additional initialization required. the control word regi ster will contain 9bh. during the execution of the system prog ram, any of the other modes may be selected using a single output instruction. this allows a single 82c55a to service a variety of peripheral devices with a simple software maintenance routine. any port programmed as an output por t is initialized to all zeros when the control word is written. figure 2. 82c55a block diagram. data bus buffer, read/write, group a & b control logic functions group a port a (8) group a port c upper (4) group b port c lower (4) group b port b (8) group b control group a control data read write control logic rd wr a1 a0 reset cs d7-d0 power supplies +5v gnd bidirectional data bus i/o pa7- i/o pc7- i/o pc3- i/o pb7- buffer bus pb0 pc0 pc4 pa0 8-bit internal data bus figure 3. basic mode definitions and bus interface data bus 8i/o b pb7-pb0 4i/o pc3-pc0 4i/o c pc7-pc4 8i/o a pa7-pa0 control bus address bus rd , wr 82c55a d7-d0 a0-a1 cs mode 0 8i/o b pb7-pb0 control c 8i/o a pa7-pa0 mode 1 or i/o control or i/o 8i/o b pb7-pb0 c bi- a pa7-pa0 mode 2 control directional ms82c55a, mq82c55a
5 fn6140.1 june 28, 2005 the modes for port a and port b can be separately defined, while port c is divided into two portions as required by the port a and port b definitions. all of the output registers, including the status flip-flops, will be reset whenever the mode is changed. modes may be combined so that their functional definition can be ?tailored? to almost any i/o structure. for instance: group b can be programmed in mode 0 to monitor simple switch closings or display computational results, group a could be programmed in mode 1 to monitor a keyboard or tape reader on an interrupt- driven basis. the mode definitions and possible mode combinations may seem confusing at first, but after a cursory review of the complete device operation a simple, logical i/o approach will surface. the design of the 82c55a has taken into account things such as efficient pc board layout, control signal definition vs. pc layout and complete functional flexibility to support almost any peripheral device with no external logic. such design represents the maximum use of the available pins. single bit set/reset feature (figure 5) any of the eight bits of port c can be set or reset using a single output instruction. this feature reduces software requirements in contro l-based applications. when port c is being used as status/control for port a or b, these bits can be set or reset by using the bit set/reset operation just as if they were output ports. interrupt control functions when the 82c55a is programmed to operate in mode 1 or mode 2, control signals are provided that can be used as interrupt request inputs to the cpu. the interrupt request signals, generated from port c, can be inhibited or enabled by setting or resetting the asso ciated inte flip-flop, using the bit set/reset function of port c. this function allows the programmer to enable or disable a cpu interrupt by a specific i/o device without affecting any other device in the interrupt structure. inte flip-flop definition (bit-set)-inte is set - interrupt enable (bit-reset)-inte is reset - interrupt disable note: all mask flip-flops are automatically reset during mode selection and device reset. operating modes mode 0 (basic input/output). this functional configuration provides simple input and output operations for each of the three ports. no handshaking is required, data is simply written to or read from a specific port. mode 0 basic functional definitions: ? two 8-bit ports and two 4-bit ports ? any port can be input or output ? outputs are latched ? inputs are not latched ? 16 different input/output configurations possible figure 4. mode definition format d7 d6 d5 d4 d3 d2 d1 d0 port c (lower) 1 = input 0 = output port b 1 = input 0 = output mode selection 0 = mode 0 1 = mode 1 group b port c (upper) 1 = input 0 = output port a 1 = input 0 = output mode selection 00 = mode 0 01 = mode 1 group a 1x = mode 2 mode set flag 1 = active control word figure 5. bit set/reset format d7 d6 d5 d4 d3 d2 d1 d0 bit set/reset 1 = set 0 = reset bit select 0 bit set/reset flag control word don?t care x x x 0 = active 1234567 01010101 00110011 00001111 b0 b1 b2 ms82c55a, mq82c55a
6 fn6140.1 june 28, 2005 mode 0 port definition abgroup a # group b d4 d3 d1 d0 port a port c (upper) port b port c (lower) 0 0 0 0 output output 0 output output 0 0 0 1 output output 1 output input 0 0 1 0 output output 2 input output 0 0 1 1 output output 3 input input 0 1 0 0 output input 4 output output 0 1 0 1 output input 5 output input 0 1 1 0 output input 6 input output 0 1 1 1 output input 7 input input 1 0 0 0 input output 8 output output 1 0 0 1 input output 9 output input 1 0 1 0 input output 10 input output 1 0 1 1 input output 11 input input 1 1 0 0 input input 12 output output 1 1 0 1 input input 13 output input 1 1 1 0 input input 14 input output 1 1 1 1 input input 15 input input mode 0 port definition a b group a # group b d4 d3 d1 d0 port a port c (upper) port b port c (lower) mode 0 (basic input) mode 0 (basic output) tra thr trr tir tar trd tdf rd input cs , a1, a0 d7-d0 taw twa twb tww twd tdw wr d7-d0 cs , a1, a0 output ms82c55a, mq82c55a
7 fn6140.1 june 28, 2005 mode 0 configurations control word #0 control word #2 control word #1 control word #3 control word #4 control word #8 control word #5 control word #9 1 d7 0 d6 0 d5 0 d4 0 d3 0 d2 0 d1 0 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 0 d4 0 d3 0 d2 1 d1 0 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 0 d4 0 d3 0 d2 0 d1 1 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 0 d4 0 d3 0 d2 1 d1 1 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 0 d4 1 d3 0 d2 0 d1 0 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 1 d4 0 d3 0 d2 0 d1 0 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 0 d4 1 d3 0 d2 0 d1 1 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 1 d4 0 d3 0 d2 0 d1 1 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c ms82c55a, mq82c55a
8 fn6140.1 june 28, 2005 control word #6 control word #10 control word #7 control word #11 control word #12 control word #14 control word #13 control word #15 mode 0 configurations (continued) 1 d7 0 d6 0 d5 0 d4 1 d3 0 d2 1 d1 0 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 1 d4 0 d3 0 d2 1 d1 0 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 0 d4 1 d3 0 d2 1 d1 1 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 1 d4 0 d3 0 d2 1 d1 1 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 1 d4 1 d3 0 d2 0 d1 0 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 1 d4 1 d3 0 d2 1 d1 0 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 1 d4 1 d3 0 d2 0 d1 1 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c 1 d7 0 d6 0 d5 1 d4 1 d3 0 d2 1 d1 1 d0 8 pa7 - pa0 4 pc7 - pc4 4 pc3 - pc0 8 pb7 - pb0 d7 - d0 82c55a a b c ms82c55a, mq82c55a
9 fn6140.1 june 28, 2005 operating modes mode 1 - (strobed input/output). this functional configuration provides a means for transferring i/o data to or from a specified port in conjunction with strobes or ?hand shaking? signals. in mode 1, port a and port b use the lines on port c to generate or accept these ?hand shaking? signals. mode 1 basic function definitions: ? two groups (group a and group b) ? each group contains one 8-bit port and one 4-bit control/data port ? the 8-bit data port can be either input or output. both inputs and outputs are latched. ? the 4-bit port is used for control and status of the 8-bit port. input control signal definition (figures 6 and 7) stb (strobe input) a ?low? on this input loads data into the input latch. ibf (input buffer full f/f) a ?high? on this output indicates that the data has been loaded into the input latch: in essence, an acknowledgment. ibf is set by stb input being low and is reset by the rising edge of the rd input. intr (interrupt request) a ?high? on this output can be used to interrupt the cpu when an input device is requesting se rvice. intr is set by the condition: stb is a ?one?, ibf is a ?one? and inte is a ?one?. it is reset by the falling edge of rd . this procedure allows an input device to request service fr om the cpu by simply strobing its data into the port. inte a controlled by bit set/reset of pc4. inte b controlled by bit set/reset of pc2. output control signal definition (figure 8 and 9) obf - (output buffer full f/f). the obf output will go ?low? to indicate that the cpu has wr itten data out to the specified port. this does not mean valid data is sent out of the port at this time since obf can go true before data is available. data is guaranteed valid at the rising edge of obf , (see note 1). the obf f/f will be set by the rising edge of the wr input and reset by ack input being low. figure 6. mode 1 input figure 7. mode 1 (strobed input) 1 d7 0 d6 1 d5 1 d4 1/0 d3 d2 d1 d0 control word mode 1 (port a) pc4 8 ibfa pc5 inte a pa7-pa0 stb a intra pc3 pc6, pc7 i/o 2 rd pc6, pc7 1 = input 0 = output 1 d7 d6 d5 d4 d3 d2 d1 d0 control word mode 1 (port b) pc2 8 ibfb pc1 inte b pb7-pb0 stb b intrb pc0 rd 11 tst stb intr rd input from ibf peripheral tsib tsit tph tps trit trib ms82c55a, mq82c55a
10 fn6140.1 june 28, 2005 ack - (acknowledge input). a ?low? on this input informs the 82c55a that the data from port a or port b is ready to be accepted. in essence, a respons e from the peripheral device indicating that it is ready to accept data, (see note 1). intr - (interrupt request). a ?high? on this output can be used to interrupt the cpu when an output device has accepted data transmitted by the cpu. intr is set when ack is a ?one?, obf is a ?one? and inte is a ?one?. it is reset by the falling edge of wr . inte a controlled by bit set/reset of pc6. inte b controlled by bit set/reset of pc2. note: 1. to strobe data into the peripheral device, the user must operate the strobe line in a hand shaking mode. the user needs to send obf to the peripheral device, generates an ack from the peripheral device and then latch dat a into the peripheral device on the rising edge of obf . figure 8. mode 1 output 1 d7 0 d6 1 d5 1 d4 1/0 d3 d2 d1 d0 control word mode 1 (port a) pc7 8 ack a pc6 pa7-pa0 obf a intra pc3 pc4, pc5 2 wr pc4, pc5 1 = input 0 = output 1 d7 d6 d5 d4 d3 d2 d1 d0 control word mode 1 (port b) pc1 8 ack b pc2 inte b pb7-pb0 obf b intrb pc0 wr 10 inte a figure 9. mode 1 (strobed output) twob twb tak tait taob twit obf wr intr ack output combinations of mode 1: port a and port b can be individually de fined as input or output in mode 1 to support a wide variety of strobed i/o applications. figure 10. combinations of mode 1 1 d7 0 d6 1 d5 1 d4 1/0 d3 d2 d1 d0 control word port a - (strobed input) pc4 8 obf b pa7-pa0 stb a intrb pc0 pc6, pc7 2 wr pc6, pc7 1 = input 0 = output port b - (strobed output) 8 iibfa pc5 intra pc3 ack b pc2 i/o pc1 pb7, pb0 rd 10 1 d7 0 d6 1 d5 0 d4 1/0 d3 d2 d1 d0 control word port a - (strobed output) pc7 8 stb b pa7-pa0 obf a intrb pc0 pc4, pc5 2 rd pc4, pc5 1 = input 0 = output port b - (strobed input) 8 ack a pc6 intra pc3 ibfb pc1 i/o pc2 pb7, pb0 wr 11 ms82c55a, mq82c55a
11 fn6140.1 june 28, 2005 operating modes mode 2 (strobed bidirectional bus i/o) this functional configuration provides a means for communicating with a periphe ral device or structure on a single 8-bit bus for both transmitting and receiving data (bidirectional bus i/o). ?hand shaking? signals are provided to maintain proper bus flow discipline similar to mode 1. interrupt generation and enable/disable functions are also available. mode 2 basic functional definitions: ? used in group a only ? one 8-bit, bidirectional bus port (port a) and a 5-bit control port (port c) ? both inputs and outputs are latched ? the 5-bit control port (port c) is used for control and status for the 8-bit, bidirectional bus port (port a) bidirectional bus i/o co ntrol signal definition (figures 11, 12, 13, 14) intr - (interrupt request). a high on this output can be used to interrupt the cpu for both input or output operations. output operations obf - (output buffer full). the obf output will go ?low? to indicate that the cpu has written data out to port a. ack - (acknowledge). a ?low? on this input enables the three- state output buffer of port a to send out the data. otherwise, the output buffer will be in the high impedance state. inte 1 - (the inte flip-flop associated with obf ). controlled by bit set/reset of pc4. input operations stb - (strobe input). a ?low? on this input loads data into the input latch. ibf - (input buffer full f/f). a ?high? on this output indicates that data has been loaded into the input latch. inte 2 - (the inte flip-flop associated with ibf). controlled by bit set/reset of pc4. figure 11. mode control word figure 12. mode 2 1 d7 d6 d5 d4 d3 d2 d1 d0 c ontrol word 1/0 1/0 11/0 pc2-pc0 1 = input 0 = output port b 1 = input 0 = output group b mode 0 = mode 0 1 = mode 1 pc7 obf a pc6 inte pa7-pa0 ack a ibfa pc4 wr inte rd pc3 pc5 pc2-pc0 1 2 8 stb a 3 i/o intra ms82c55a, mq82c55a
12 fn6140.1 june 28, 2005 note: any sequence where wr occurs before ack and stb occurs before rd is permissible. (intr = ibf ? mask ? stb ? rd + obf ? mask ? ack ? wr ) figure 13. mode 2 (bidirectional) mode 2 and mode 0 (input) mode 2 and mode 0 (output) figure 14. mode 2 combinations twob taob tak tad tkd tph tps tsib tst obf wr intr ack ibf stb peripheral bus rd trib data from peripheral to 82c55a data from 82c55a to peripheral data from 82c55a to cpu data from cpu to 82c55a 1 d7 1 d6 d5 d4 d3 d2 d1 d0 control word pc7 8 stb a pa7-pa0 obf a ibfa pc5 pc2-pc0 3 rd pc2-pc0 1 = input 0 = output ack a pc6 intra pc3 i/o pc4 pb7-pb0 01 1/0 8 wr 1 d7 1 d6 d5 d4 d3 d2 d1 d0 control word pc7 8 stb a pa7-pa0 obf a ibfa pc5 pc2-pc0 3 rd pc2-pc0 1 = input 0 = output ack a pc6 intra pc3 i/o pc4 pb7, pb0 00 1/0 8 wr ms82c55a, mq82c55a
13 fn6140.1 june 28, 2005 mode 2 and mode 1 (output) mode 2 and mode 1 (input) mode definition summary mode 0 mode 1 mode 2 in out in out group a only pa0 pa1 pa2 pa3 pa4 pa5 pa6 pa7 in in in in in in in in out out out out out out out out in in in in in in in in out out out out out out out out pb0 pb1 pb2 pb3 pb4 pb5 pb6 pb7 in in in in in in in in out out out out out out out out in in in in in in in in out out out out out out out out pc0 pc1 pc2 pc3 pc4 pc5 pc6 pc7 in in in in in in in in out out out out out out out out intrb ibfb stb b intra stb a ibfa i/o i/o intrb obf b ack b intra i/o i/o ack a obf a i/o i/o i/o intra stb a ibfa ack a obf a figure 14. mode 2 combinations (continued) 1 d7 1 d6 d5 d4 d3 d2 d1 d0 control word pc7 8 stb a pa7-pa0 obf a ibfa pc5 rd ack a pc6 intra pc3 pc4 pb7-pb0 10 8 wr pc1 obf b ack b pc2 pc0 intrb 1 d7 1 d6 d5 d4 d3 d2 d1 d0 control word pc7 8 stb a pa7-pa0 obf a ibfa pc5 rd ack a pc6 intra pc3 pc4 pb7-pb0 11 8 wr pc2 stb b pc1 pc0 intrb ibfb mode 0 or mode 1 only ms82c55a, mq82c55a
14 fn6140.1 june 28, 2005 special mode combination considerations there are several combinations of modes possible. for any combination, some or all of port c lines are used for control or status. the remaining bits are either inputs or outputs as defined by a ?set mode? command. during a read of port c, the st ate of all the port c lines, except the ack and stb lines, will be placed on the data bus. in place of the ack and stb line states, flag status will appear on the data bus in the pc2, pc4, and pc6 bit positions as illustrated by figure 17. through a ?write port c? comm and, only the port c pins programmed as outputs in a mode 0 group can be written. no other pins can be affected by a ?write port c? command, nor can the interrupt enable flags be accessed. to write to any port c output programmed as an output in mode 1 group or to change an interrup t enable flag, the ?set/reset port c bit? command must be used. with a ?set/reset port c bit? command, any port c line programmed as an output (including ibf and obf ) can be written, or an interrupt enable flag can be either set or reset. port c lines programmed as inputs, including ack and stb lines, associated with port c are not affected by a ?set/reset port c bit? command. writing to the corresponding port c bit positions of the ack and stb lines with the ?set reset port c bit? command will affect the group a and group b interrupt enable flags, as illustrated in figure 17. current drive capability any output on port a, b or c can sink or source 2.5ma. this feature allows the 82c55a to directly drive darlington type drivers and high-voltage displays that require such sink or source current. reading port c status (figures 15 and 16) in mode 0, port c transfers data to or from the peripheral device. when the 82c55a is programmed to function in modes 1 or 2, port c generates or accepts ?hand shaking? signals with the peripheral de vice. reading the contents of port c allows the prog rammer to test or veri fy the ?status? of each peripheral device and change the program flow accordingly. there is not a special instruction to read the status information from port c. a normal read operation of port c is executed to perform this function. applications of the 82c55a the 82c55a is a very powerful t ool for interfacing peripheral equipment to the microcomputer system. it represents the optimum use of available pins and is flexible enough to interface almost any i/o device without the need for additional external logic. each peripheral device in a microcomputer system usually has a ?service routine? as sociated with it. the routine manages the software interface between the device and the cpu. the functional definition of the 82c55a is programmed by the i/o service routine and becomes an extension of the system software. by examini ng the i/o devices interface characteristics for both data transfer and timing, and matching this information to the examples and tables in the detailed operational description, a control word can easily be developed to initialize the 82c55a to exactly ?fit? the application. figures 18 through 24 present a few examples of typical applications of the 82c55a. input configuration d7 d6 d5 d4 d3 d2 d1 d0 i/o i/o ibfa intea intra inteb ibfb intrb output configuration d7 d6 d5 d4 d3 d2 d1 d0 obfa intea i/o i/o intra inteb obfb intrb figure 15. mode 1 status word format d7 d6 d5 d4 d3 d2 d1 d0 obfa inte1 ibfa inte2 intra x x x (defined by mode 0 or mode 1 selection) figure 16. mode 2 status word format group a group b group a group b group a group b interrupt enable flag position alternate port c pin signal (mode) inte b pc2 ack b (output mode 1) or stb b (input mode 1) inte a2 pc4 stb a (input mode 1 or mode 2) inte a1 pc6 ack a (output mode 1 or mode 2) figure 17. interrupt enable flags in modes 1 and 2 ms82c55a, mq82c55a
15 fn6140.1 june 28, 2005 figure 18. printer interface figure 19. keyboard and display interface figure 20. keyboard and terminal address interface pa0 pa1 pa2 pa3 pa4 pa5 pa6 pa7 pc7 pc6 pc5 pc4 pb0 pb1 pb2 pb3 pb4 pb5 pb6 pb7 pc1 pc2 data ready ack paper feed forward/rev. data ready ack paper feed forward/rev. ribbon carriage sen. mode 1 (output) 82c55a mode 1 (output) control logic and drivers interrupt request pc0 interrupt request pc3 hammer relays high speed printer pa0 pa1 pa2 pa3 pa4 pa5 pa6 pa7 pc4 pc5 pb0 pb1 pb2 pb3 pb4 pb5 pb6 pb7 pc1 pc2 strobe ack data ready ack mode 1 (output) 82c55a mode 1 (input) fully decoded interrupt request interrupt request pc3 pc6 pc7 keyboard r0 r1 r2 r3 r4 r5 shift control b0 b1 b2 b3 b4 b5 backspace clear burroughs self-scan display blanking cancel word strobe ack fully decoded keyboard r0 r1 r2 r3 r4 r5 shift control pa0 pa1 pa2 pa3 pa4 pa5 pa6 pa7 pc4 pc5 pc6 pc7 pb0 pb1 pb2 pb3 pb4 pb5 pb6 pb7 mode 0 (input) 82c55a mode 1 (input) pc3 bust lt test lt terminal address interrupt request ms82c55a, mq82c55a
16 fn6140.1 june 28, 2005 figure 21. digital to analog, analog to digi tal figure 22. basic crt controller interface figure 23. basic floppy disc interface figu re 24. machine tool controller interface pa0 pa1 pa2 pa3 pa4 pa5 pa6 pa7 pc4 pc5 pc6 pc7 pc1 pc2 pc3 pb0 pb1 pb2 pb4 pb5 lsb stb data msb mode 0 (input) 82c55a mode 0 (output) 12-bit d/a converter (dac) pc0 pb3 pb6 pb7 bit set/reset sample en stb lsb 8-bit a/d converter (adc) analog input analog output msb pa0 pa1 pa2 pa3 pa4 pa5 pa6 pa7 pc7 pc6 pc5 pc4 pb0 pb1 pb2 pb3 pb4 pb5 pb6 pb7 pc2 pc1 mode 0 (output) 82c55a mode 1 (output) pc3 data ready ack crt controller 2 character gen. interrupt request 2 refresh buffer r0 r1 r2 r3 r4 r5 shift control row stb column stb cursor h/v stb cursor/row/column 2 cursor control pc0 address h&v blanked black/white pa0 pa1 pa2 pa3 pa4 pa5 pa6 pa7 pc4 pc5 pc7 pc6 pb0 pb1 pb2 pb3 pb4 pb5 pb6 pb7 pc1 pc0 mode 0 (output) 82c55a mode 2 pc3 data stb ack (in) floppy disk interrupt request d0 d1 d2 d3 d4 d5 d6 d7 track ?0? sensor sync ready index data ready ack (out) pc2 engage head forward/rev. read enable write enable disc select enable crc test busy lt controller and drive pa0 pa1 pa2 pa3 pa4 pa5 pa6 pa7 pc4 pc5 pc6 pb0 pb1 pb2 pb3 pb4 pb5 pb6 pb7 pc1 pc2 mode 0 (output) 82c55a mode 1 pc3 stb ack b level interrupt request r0 r1 r2 r3 r4 r5 r6 r7 start/stop limit sensor (h/v) out of fluid stop/go pc0 change tool left/right up/down hor. step strobe vert. step strobe slew/step fluid enable emergency stop paper tape reader (input) machine tool mode 0 (input) ms82c55a, mq82c55a
17 fn6140.1 june 28, 2005 absolute maxi mum ratings t a = 25c thermal information supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +8.0v input, output or i/o voltage . . . . . . . . . . . . gnd-0.5v to v cc +0.5v esd classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . class 1 operating conditions voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.5v to 5.5v operating temperature range cmx82c55a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0c to 70c imx82c55a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40c to 85c thermal resistance (typical, note 1) ja (c/w) plcc package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 mqfp package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 maximum storage temperature range . . . . . . . . . . -65c to 150c maximum junction temperature plastic packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150c maximum lead temperature (soldering 10s) . . . . . . . . . . . . 300c (lead tips only) die characteristics gate count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 gates caution: stresses above those listed in ?absolute maximum ratings? may cause permanent damage to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. note: 1. ja is measured with the component mount ed on an evaluation pc board in free air. electrical specifications v cc = 5.0v 10%; t a = operating temperature range symbol parameter test conditions min typ max units v ih logical one input voltage 2.0 2.2 --v v il logical zero input voltage - - 0.8 v v oh logical one output voltage i oh = -2.5ma, i oh = -100 a 3.0 v cc -0.4 --v v ol logical zero output voltage i ol +2.5ma - - 0.4 v i i input leakage current v in = v cc or gnd, rd , cs , a1, a0, reset, wr -1.0 - +1.0 a io i/o pin leakage current vo = v cc or gnd, d0 - d7 -10 - +10 a idar darlington drive current ports a, b, c. test condition 3 -2.5 - notes 2, 4 ma iccsb standby power supply current v cc = 5.5v, v in = v cc or gnd. output open - - 10 a iccop operating power supply current t a = +25c, v cc = 5.0v, typical (see note 3) - 1 - ma/mhz notes: 2. no internal current limiting exists on port outputs. a resistor must be added externally to limit the current. 3. iccop = 1ma/mhz of peripheral read/write cycle time. (example: 1.0 s i/o read/write cycle time = 1ma). 4. tested as v oh at -2.5ma. capacitance t a = 25c symbol parameter typical units test conditions cin input capacitance 10 pf freq = 1mhz, all measurements are referenced to device gnd ci/o i/o capacitance 20 pf ms82c55a, mq82c55a
18 fn6140.1 june 28, 2005 ac electrical specifications v cc = +5v 10%, gnd = 0v; t a = operating temperature range symbol parameter test conditions 82c55a units min max read timing (1) tar address stable before rd 0-ns (2) tra address stable after rd 0-ns (3) trr rd pulse width 150 - ns (4) trd data valid from rd 1 - 120 ns (5) tdf data float after rd 21075ns (6) trv time between rd s and/or wr s 300 - ns write timing (7) taw address stable before wr 0-ns (8) twa address stable after wr 20 - ns (9) tww wr pulse width 100 - ns (10) tdw data valid to wr high 100 - ns (11) twd data valid after wr high 30 - ns other timing (12) twb wr = 1 to output 1 - 350 ns (13) tir peripheral data before rd 0-ns (14) thr peripheral data after rd 0-ns (15) tak ack pulse width 200 - ns (16) tst stb pulse width 100 - ns (17) tps peripheral data before stb high 20 - ns (18) tph peripheral data after stb high 50 - ns (19) tad ack = 0 to output 1 - 175 ns (20) tkd ack = 1 to output float 2 20 250 ns (21) twob wr = 1 to obf = 0 1 - 150 ns (22) taob ack = 0 to obf = 1 1 - 150 ns (23) tsib stb = 0 to ibf = 1 1 - 150 ns (24) trib rd = 1 to ibf = 0 1 - 150 ns (25) trit rd = 0 to intr = 0 1 - 200 ns (26) tsit stb = 1 to intr = 1 1 - 150 ns (27) tait ack = 1 to intr = 1 1 - 150 ns (28) twit wr = 0 to intr = 0 1 - 200 ns (29) tres reset pulse width 1, (note) 500 - ns note: period of initial reset pulse after power-on must be at least 50 sec. subsequent reset pulses may be 500ns minimum. ms82c55a, mq82c55a
19 fn6140.1 june 28, 2005 timing waveforms figure 25. mode 0 (basic input) figure 26. mode 0 (basic output) figure 27. mode 1 (strobed input) tra (2) thr (14) trr (3) tir (13) tar (1) trd (4) tdf (5) rd input cs , a1, a0 d7-d0 taw (7) twa (8) tws (12) tww (9) twd (11) tdw wr d7-d0 cs , a1, a0 output (10) tst (16) stb intr rd input from ibf peripheral tsib tsit tph tps (17) trit trib (24) (23) (26) (25) (18) ms82c55a, mq82c55a
20 fn6140.1 june 28, 2005 figure 28. mode 1 (strobed output) figure 29. mode 2 (bidirectional) note: any sequence where wr occurs before ack and stb occurs before rd is permissible. (intr = ibf ? mask ? stb ? rd + obf ? mask ? ack ? wr ) timing waveforms (continued) twob (21) twb (12) tak (15) tait (27) taob (22) twit obf wr intr ack output (28) twob taob tak tad (19) tkd tph (18) tps (17) tsib tst obf wr intr ack ibf stb peripheral bus rd trib (24) data from peripheral to 82c55a data from 82c55a to peripheral data from 82c55a to cpu data from cpu to 82c55a (21) (22) (15) (16) (20) (23) (note) (note) ms82c55a, mq82c55a
21 fn6140.1 june 28, 2005 figure 30. write timing figure 31. read timing timing waveforms (continued) wr data a0-a1, cs bus tww (9) tdw (10) twd (11) twa (8) taw (7) rd data a0-a1, cs bus trr (3) tra (2) tar (1) valid (4) trd tdf (5) high impedance ac test circuit ac testin g input, output waveforms r1 v1 output from device under test test point c1 r2 (see note) note: includes stray and jig capacitance input vih + 0.4v vil - 0.4v 1.5v 1.5v voh vol output a c testing: all ac parameters tested as per test circuits. input rise and fall times are driven at 1ns/v. test condition definition table test condition v1 r1 r2 c1 1 1.7v 523 ? open 150pf 2v cc 2k ? 1.7k ? 50pf 3 1.5v 750 ? open 50pf ms82c55a, mq82c55a
22 fn6140.1 june 28, 2005 die characteristics metallization: type: silicon - aluminum thickness: 11k ? 1k ? glassivation: type: sio 2 thickness: 8k ? 1k ? metallization mask layout 82c55a rd pa0 pa1 pa2 pa3 pa4 pa5 pa6 pa7 wr cs gnd a0 pc7 pc6 pc5 pc4 pc0 pc1 pc2 pc3 pb0 pb1 pb2 pb3 pb4 pb5 pb6 pb7 v cc d6 d5 d4 d3 d2 d1 d0 reset d7 a1 ms82c55a, mq82c55a
23 fn6140.1 june 28, 2005 ms82c55a, mq82c55a plastic leaded chip carrier packages (plcc) notes: 1. controlling dimension: inch. c onverted millimeter dimensions are not necessarily exact. 2. dimensions and tolerancing per ansi y14.5m-1982. 3. dimensions d1 and e1 do not include mold protrusions. allowable mold protrusion is 0.010 inch (0.25mm) per side. dimensions d1 and e1 include mold mismatch and are measured at the extreme material condition at the body parting line. 4. to be measured at seating plane contact point. 5. centerline to be determined where center leads exit plastic body. 6. ?n? is the number of terminal positions. -c- a1 a seating plane 0.020 (0.51) min view ?a? d2/e2 0.025 (0.64) 0.045 (1.14) r 0.042 (1.07) 0.056 (1.42) 0.050 (1.27) tp e e1 0.042 (1.07) 0.048 (1.22) pin (1) identifier c l d1 d 0.020 (0.51) max 3 plcs 0.026 (0.66) 0.032 (0.81) 0.045 (1.14) min 0.013 (0.33) 0.021 (0.53) 0.025 (0.64) min view ?a? typ. 0.004 (0.10) c -c- d2/e2 c l n44.65 (jedec ms-018ac issue a) 44 lead plastic leaded chip carrier package symbol inches millimeters notes min max min max a 0.165 0.180 4.20 4.57 - a1 0.090 0.120 2.29 3.04 - d 0.685 0.695 17.40 17.65 - d1 0.650 0.656 16.51 16.66 3 d2 0.291 0.319 7.40 8.10 4, 5 e 0.685 0.695 17.40 17.65 - e1 0.650 0.656 16.51 16.66 3 e2 0.291 0.319 7.40 8.10 4, 5 n44 446 rev. 2 11/97
24 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications ca n be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com fn6140.1 june 28, 2005 ms82c55a, mq82c55a metric plastic quad flatpack packages (mqfp) d d1 e e1 -a- pin 1 a2 a1 a 12 o -16 o 12 o -16 o 0 o -7 o 0.40 0.016 min l 0 o min plane b 0.005/0.009 0.13/0.23 with plating base metal seating 0.005/0.007 0.13/0.17 b1 -b- e 0.008 0.20 a-b s d s c m 0.076 0.003 -c- -d- -h- q44.10x10 (jedec ms-022ab issue b) 44 lead metric plastic quad flatpack package symbol inches millimeters notes min max min max a - 0.096 - 2.45 - a1 0.004 0.010 0.10 0.25 - a2 0.077 0.083 1.95 2.10 - b 0.012 0.018 0.30 0.45 6 b1 0.012 0.016 0.30 0.40 - d 0.515 0.524 13.08 13.32 3 d1 0.389 0.399 9.88 10.12 4, 5 e 0.516 0.523 13.10 13.30 3 e1 0.390 0.398 9.90 10.10 4, 5 l 0.029 0.040 0.73 1.03 - n44 447 e 0.032 bsc 0.80 bsc - rev. 2 4/99 notes: 1. controlling dimension: millimeter. converted inch dimensions are not necessarily exact. 2. all dimensions and toleranc es per ansi y14.5m-1982. 3. dimensions d and e to be determined at seating plane . 4. dimensions d1 and e1 to be determined at datum plane . 5. dimensions d1 and e1 do not include mold protrusion. allowable protrusion is 0.25mm (0.010 inch) per side. 6. dimension b does not include dambar protrusion. allowable dambar protrusion shall be 0.08mm (0.003 inch) total. 7. ?n? is the number of terminal positions. -c- -h-

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