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a microconverter, dual 16 - bit/24 - bit adcs with embedded 62kb flash mcu preliminary technical data ADUC844 rev. prb information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective companies. one technology way, p.o. box 9106, norwood, ma 02062 - 9106, u.s .a. tel: 781/329 - 4700 www.analog.com fax: 781/326 - 8703 ? 2003 analog devices, inc. all rights reserved. preliminary technical data features high resolution sigma - delta adcs two independent adcs (24 - bit and 16 - bit resolution) 24 - bit no missing codes, primary adc 21 - bit rms (18.5 bit p - p) effective resolution @ 20 hz offset drift 10 nv/ c, gain drift 0.5 ppm/c memory 62 kbytes on - chip flash/ee program memory 4 kbytes on - chip flash/ee data memory flash/ee, 100 year retention, 100 kcycles endurance 3 levels of flash/ee program memory security in - circuit serial download (no external hardware) high speed user download (5 seconds) 2304 bytes on - chip data ram 8051 - based core 8051 compatible instruction set high performance single cycle core 32 khz external crystal on - chip programmable pll (12.58 mhz max) 3 16 - bit timer/counter 26 programmable i/o lines 11 interrupt sources, two priority leve ls dual data pointer, extended 11 - bit stack pointer on - chip peripherals internal power on reset circuit 12 - bit voltage output dac dual 16 - bit s - d dacs/pwms on - chip temperature sensor dual excitation current sources time interval counter (wakeup/rtc timer) uart, spi ? , and i 2 c ? serial i/o high speed baud rate generator (incl 115,200) watchdog timer (wdt) power supply monitor (psm) power normal: 2.3ma max @ 3.6 v (core clk = 1.57 mhz) power - down: 20 m m a max with wakeup timer running specified for 3 v and 5 v operation package and temperature range 52 - lead mqfp (14 mm 14 mm), ? 40c to +125c 56 - lead csp (8 mm 8 mm), ? 40c to +85c applications intelligent sensors weighscales portable instrumentatio n, battery powered systems 4 - 20ma transmitters data logging precision system monitoring functional block diagram general description the ADUC844 is a complete smart transducer front end, integrating two high resolution sigma - delta adcs, an 8 - bit mcu, and program/data flash/ee memory on a single chip. the two independent adcs (primary and auxiliary) include a temperature sensor and a pga (allowing direct measurement of low level signals). the adcs with on - chip digital filtering and programmable output data rates are intended for the measurement of wide dynamic range, low frequency signals, such as those in weigh scale, strain - gage, pressure transducer, or temperature measurement applications. the device operates from a 32 khz crystal with an on - chip pl l generating a high frequency clock of 12.58 mhz. this clock is routed through a programmable clock divider from which the mcu core clock operating frequency is generated. the microcontroller core is an optimized single cycle 8052 offering up to 12.58mips performance while maintaining the 8051 instruction set compatibility. 62 kbytes of nonvolatile flash/ee program memory, 4 kbytes of nonvolatile flash/ee data memory, and 2304 bytes of data ram are provided on - chip. the program memory can be configured as data memory to give up to 60 kbytes of nv data memory in data logging applications. on - chip factory firmware supports in - circuit serial download and debug modes (via uart), as well as single - pin emulation mode via the ea pin. the ADUC844 is supported by a quickstart? development system featuring low cost software and hardware development tools.
ADUC844 specifications 1 - 2 - rev. prb preliminary technical data (avdd = 2.7 v to 3.6 v or 4.75 v to 5.25 v, dvdd = 2.7 v to 3.6 v or 4.75 v to 5.25 v, refin(+) = 2.5 v, refin( ? ) = agnd; agnd = dgnd = 0 v; xtal1/xtal2 = 32.768 khz crystal; all specifications t min , to t max unless otherwise noted.). parameter min typ max units condition primary adc conversion rate 5.35 19.79 105 hz on both channels no missing codes 2 24 bits 19.79hz update rate resolution 13.5 bits pk - pk range = 20mv, 20hz update rate 18.5 bits pk - pk range = 2.56v, 20hz update rate output noise see tables x and xi in adc description output noise varies with selected update rates and gain range integral non linearit y 15 ppm of fsr 1 lsb 16 offset error 3 3 m v offset error drift (vs. temp) 10 nv/c full - scale error 4 10 m v gain error drift 5 (vs. temp) 0.5 ppm/c adc range matching 2 m v ain=18mv power supply rejection 80 dbs ain=1v, range= 2.56v 113 dbs ain=7.8mv, range= 20mv common mode dc rejection on ain 95 dbs @dc, ain=7.8mv, range= 20mv on ain 113 dbs @dc, ain=1v, range= 2.56v common mode 50/60hz rejection 20 hz update rate on ain 95 dbs 50/60hz 1hz, ain=7.8mv, range= 20mv on ain 9 0 dbs 50/60hz 1hz, ain=1v, range= 2.56v normal mode 50/60 hz rejection on ain 60 dbs 50/60hz 1hz, 20 hz update rate primary adc analog inputs differential input voltage ranges 9,10 bipolar mode (adc0con.5 = 0) 1 .024 x v ref /gain v v ref = refin(+) - refin( - ) (or int 1.25v ref) gain = 1 to 128 unipolar mode (adc0con.5 = 1) 0 1.024 x refin/gain v v ref = refin(+) - refin( - ) gain=1 to 128 analog input current 2 1 na t max = 85c 5 na t max = 125c analog input current drift 5 pa/c t max = 85c 15 pa/c t max = 125c absolute ain voltage limits 2 a gnd + 0.1 av dd ? 0.1 v external reference inputs refin(+) to refin( ? ) range 2 1 2.5 av dd v average reference input current + / - 1 m a/v both adcs enabled average reference input current drift +/ - 0.01 na/v/c ?no ext. ref? trigger voltage 0.3 0.65 v noxref bit active if vref<0.3v noxref bit inactive if vref>0.65 common mode dc rejection 125 dbs @dc, ain=1v, ran ge= 2.56v common mode 50/60hz rejection 90 dbs 50/60hz 1hz, ain=1v, range= 2.56v normal mode 50/60 hz rejection 60 dbs 50/60hz 1hz, 59.4 hz update rate
ADUC844 rev. prb - 3 - preliminary technical data parameter min typ max units condition auxiliary adc no missing co des 2 16 bits 20 hz update rate resolution 16 bits pk - pk range = 2.5v, 20hz update rate output noise see table xii output noise varies with selected update rates integral non linearity 15 ppm of fsr 1 lsb 16 offset error 3 - 2 lsb offs et error drift 1 m v /c fullscale error 4 - 2.5 lsbs gain error drift 5 0.5 ppm/c power supply rejection 80 dbs ain=1v, range= 2.56v normal mode 50/60 hz rejection on ain 60 dbs 50/60hz 1hz, 19.79hz update rate on refin 60 dbs 50/60hz 1hz, 19.79hz update rate auxiliary adc analog inputs differential input voltage ranges 9, 10 (bipolar mode ? adc0con3 = 0) refin v refin=refin(+) - refin( - ) (or int 1.25v ref) (unipolar mode ? adc0con3 = 1) 0 refin v refin=refin(+) - refin( - ) (or int 1.25v ref) average analog input current 125 na/v analog input current drift 2 pa/v/c absolute ain voltage limits 2, 11 a gnd - 0.03 a vdd + 0.03 v adc system calibration full scale calibration limit +1.05 x fs v zero scale calibration limit - 1.05 x fs v input span 0.8 x fs 2.1 x fs v dac voltage range 0 v ref v daccon.2 = 0 0 av dd v daccon.2 = 1 resistive load 10 k w from dac output to agnd capactive load 100 pf from dac output to agnd output impedance 0.5 w i sink 50 m a dc specifications 7 resolution 12 relative accuracy 3 lsbs differential nonlinearity - 1 bit guaranteed 12 - bit monotonic offs et error 50 mv gain error 8 1 % av dd range 1 % v ref range ac specifications 2,7 voltage output settling time 15 us setling time to 1lsb of final value digital to analog glitch energy 10 nvs 1 lsb change at major carry
ADUC844 specifications 1 - 4 - rev. prb preliminary technical data parameter min typ max units condition int reference adc reference reference voltage 1.237 1.25 1.2625 v initial tolerance @ 25c, vdd=5v power supply rejection 45 dbs reference tempco 100 ppm/c dac reference reference voltage 2.475 2.5 1.525 v initial tolerance @ 25c, vdd=5v power supply rejection 50 dbs reference tempco 100 ppm/c temperature sensor accuracy +/ - 2 c thermal impedance 90 c/w mqfp package 52 c/w csp package transducer burnout current sources ain+ current - 100 na ain+ is the selected positive input to the primary adc ain - current 100 na ain - is the selected negative input to the primary adc initial tolerance at 25c +/ - 10 % drift 0.03 %/c excitation current sources output current - 200 m a available from each current source initial tolerance at 25c +/ - 10 % drift 200 ppm/c initial current matching at 25c +/ - 1 % matching between bo th current sources drift matching 20 ppm/c line regulation (av dd ) 1 m a/v av dd =5v +/ - 5% load regulation 0.1 v output compliance a gnd av dd - 0.6 v power supply monitor (psm) av dd trip point selection range 2.63 4.63 v four trip points selectable in this range av dd trip point accuracy +/ - 3.0 % t max = 85c av dd trip point accuracy +/ - 3.0 % t max = 125c dv dd trip point selection range 2.63 4.63 v four trip points selectable in this range dv dd trip point accuracy +/ - 3.0 % t max = 85c dv dd trip point accuracy +/ - 3.0 % t max = 125c crystal oscillator (xtal 1and xtal2) logic inputs, xtal1 only 2 v inl , input low voltage 0.8 v dv dd = 5v 0.4 v dv dd = 3v v inh , input low voltage 3.5 v dv dd = 5v 2.5 v dv dd = 3v xtal1 input capacitance 18 pf xtal2 output capacitance 18 pf
ADUC844 rev. prb - 5 - preliminary technical data parameter min typ max units condition logic inputs all inputs except sclock, reset and xtal1 2 v inl , input low voltage 0.8 v dv dd = 5v 0.4 v dv dd = 3v v inh , input low voltage 2.0 v sclock and reset only (schmidt triggered inputs) 2 v t+ 1.3 3.0 v dv dd = 5v 0.95 2.5 v dv dd = 3v v t - 0.8 1.4 v dv dd = 5v 0.4 1.1 v dv dd = 3v v t+ - v t - 0.3 0.85 v dv d d = 5v or 3v input currents 2.0 v port 0, p1.2 p1.7, ea +/ - 10 m a v in = 0v or v dd sclock, mosi,miso ss 13 - 10 - 40 m a v in = 0v, dv dd =5v, internal pullup +/ - 10 m a v in = dv dd , dv dd =5v reset +/ - 10 m a v in = 0v, dv dd =5v 35 105 m a v in = dv dd , dv dd =5v, internal pull - down p1.0, p1.1, port 2, port 3 +/ - 10 m a v in = dv dd , dv dd =5v - 180 - 660 m a v in = 2v, dv dd =5v - 20 - 75 m a v in = 0.45v, dv dd =5v input capacitance 5 pf all digital inputs logic outputs a ll digital outputs except xtal2 2 v oh , output high voltage 2.4 v dv dd = 5v, i source = 80 m a 2.4 v dv dd = 3v, i source = 20 m a v ol , output low voltage 14 0.8 v i sink = 8ma, sclock, mosi/sdata 0.8 v i sink = 10ma, p1.0, p1.1 0.8 v i sink = 1.6ma, all other outputs floating state leakage current +/ - 10 m a floating state output capacitance 5 pf start up time at power on 300 ms after external reset in normal mode 3 ms after wdt reset in normal mode 3 ms controlled via wdcon sfr from idle mode 10 us from power - down mode oscillator running pllcon.7 = 0 wakeup with int0 interrupt 20 us wakeup with spi interrupt 20 us wakeup with tic interrupt 20 us wakeup with external reset 3 us oscillator powered down pllcon.7 = 1 wakeup with int0 interrupt 20 us wakeup with spi interrupt 20 us wakeup with external reset 5 ms
ADUC844 specifications 1 - 6 - rev. prb preliminary technical data parameter min typ max units condition flah/ee memory reliability characteristics endurance 16 100,000 700,000 cycles data retention 17 100 power requirements power supply voltages av dd 3v nominal 2.7 3.6 v av dd 5v nominal 4.75 5.25 v dv dd 3v nominal 2.7 3. 6 v dv dd 5v nominal 4.75 5.25 v 5v power consumption 4.75v < dvdd <5.25v, avdd= 5.25v normal mode 18, 19 dv dd current 4 ma core clock = 1.57mhz 13 16 ma core clock = 12.58mhz av dd current 180 m a power - down mode 18, 19 dv dd current 53 m a t max = 85c; osc on;tic on 100 m a t max = 125c; osc on; tic on dv dd current 30 m a t max = 85c; osc off 80 m a t max = 125c; osc off av dd current 1 m a t max = 85c; osc on or off 3 m a t max = 125c; osc on or off typical additional peripheral currents (ai dd and d i dd ) primary adc 1 ma auxiliary adc 0.5 ma power supply monitor 50 m a dac 150 m a dual excitation current sources 400 m a 3v power consumption 4.75v < dvdd <5.25v, avdd= 5.25v normal mode 18, 19 dv dd current 2.3 ma core clock = 1.57mhz 8 10 ma core clock = 12.58mhz av dd current 180 m a power - down mode 18, 19 dv dd current 20 m a t max = 85c; osc o n;tic on 40 m a t max = 125c; osc on; tic on dv dd current 10 m a osc off 80 m a t max = 125c; osc off av dd current 1 m a t max = 85c; osc on or off 3 m a t max = 125c; osc on or off
ADUC844 rev. prb - 7 - preliminary technical data notes 1 temperature range for ADUC844bs (mqfp package ) is ? 40c to +125c. temperature range for ADUC844bcp (csp package) is ? 40c to +85c. 2 these numbers are not production tested but are guaranteed by design and/or characterization data on production release. 3 system zero - scale calibration can remove this error. 4 the primary adc is factory calibrated at 25c with a vdd = d vdd = 5 v yielding this full - scale error of 10 v. if user power supply or temperature conditions are significantly different from these, an internal full - scale calibration will rest ore this error to 10 v. a system zero - scale and full - scale calibration will remove this error altogether. 5 gain error drift is a span drift. to calculate full - scale error drift, add the offset error drift to the gain error drift times the full - scale inpu t. 6 the auxiliary adc is factory calibrated at 25c with a vdd = d vdd = 5 v yielding this full - scale error of ? 2.5 lsb. a system zero - scale and full - scale calibration will remove this error altogether. 7 dac linearity and ac specifications are calculated using: reduced code range of 48 to 4095, 0 to vre f, reduced code range of 100 to 3950, 0 to vd d. 8 gain error is a measure of the span error of the dac. 9 in general terms, the bipolar input voltage range to the primary adc is given by rangeadc = ( vref 2 rn )/125, where: vref = refin(+) to refin( ? ) voltage and vref = 1.25 v when internal adc vref is selected. rn = decimal equivalent of rn2, rn1, rn0 e.g., vref = 2.5 v and rn2, rn1, rn0 = 1, 1, 0 the rang eadc = 1.28 v, in unipolar mode, the effective range is 0 v to 1.28 v in our example. 10 1.25 v is used as the reference voltage to the adc when internal vref is selected via xref0 and xref1 bits in adc0con and adc1con, respectively. 11 in bipolar mode, the auxiliary adc can only be driven to a minim um of agnd ? 30 mv as indicated by the auxiliary adc absolute ain voltage limits. the bipolar range is still ? vref to + vre f; however, the negative voltage is limited to ? 30 mv. 12 the ADUC844bcp (csp package) has been qualified and tested with the base of the csp package floating. 13 pins configured in spi mode, pins configured as digital inputs during this test. 14 pins configured in i 2 c mode only. 15 flash/ee memory reliability characteristics apply to both the flash/ee program memory and flash/ee dat a memory. 16 endurance is qualified to 100 kcycles as per jedec std. 22 method a117 and measured at ? 40 c, +25c, +85c, and +125c. typical endurance at 25c is 700 kcycles. 17 retention lifetime equivalent at junction temperature ( t j) = 55c as per je dec std. 22, method a117. retention lifetime based on an activation energy of 0.6ev will derate with junction temperature as shown in figure 16 in the flash/ee memory section of this data sheet. 18 power supply current consumption is measured in normal, i dle, and power - down modes under the following conditions: normal mode: reset = 0.4 v, digital i/o pins = open circuit, core clk changed via cd bits in pllcon, core executing internal software loop. idle mode: reset = 0.4 v, digital i/o pins = open circui t, core clk changed via cd bits in pllcon, pcon.0 = 1, core execution suspended in idle mode. power - down mode: reset = 0.4 v, all p0 pins and p1.2 ? p1.7 pins = 0.4 v, all other digital i/o pins are open circuit, core clk changed via cd bits in pllcon, pcon .1 = 1, core execution suspended in power - down mode, osc turned on or off via osc_pd bit (pllcon.7) in pllcon sfr. 19 d vdd power supply current will increase typically by 3 ma (3 v operation) and 10 ma (5 v operation) during a flash/ee memory program or e rase cycle. specifications subject to change without notice
ADUC844 - 8 - rev. prb preliminary technical data absolute maximum ratings (t a = 25c unless otherwise noted) av dd to agnd ? 0.3 v to +7 v av dd to dgnd ? 0.3 v to +7 v dv dd to agnd ? 0.3 v to +7 v dv dd to dgnd ? 0.3 v to +7 v agnd to dgnd 2 ? 0.3 v to +0.3 v av dd to dv dd ? 2 v to +5 v analog input voltage to agnd 3 ? 0.3 v to av dd +0.3 v reference input voltage to agnd ? 0.3 v to av dd +0.3 v ain/refin current (indefinite) 30 ma digital input voltage to dgnd ? 0.3 v to dv dd +0.3 v digit al output voltage to dgnd ? 0.3 v to dv dd +0.3 v operating temperature range ? 40c to +125c storage temperature range ? 65c to +150c junction temperature 150c q ja thermal impedance 90c/w lead temperature, soldering vapor phase (60 sec) 215 c infrared (15 sec) 220c 1 stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those listed in the op erational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2 agnd and dgnd are shorted internally on the ADUC844. 3 applies to p1.2 to p1.7 pins operating in ana log or digital input modes. ordering guide model temperature range ( o c) voltage range (v) user code space package description package option ADUC844bs62 - 5 - 40 +125 4.75 5.25 62 kbytes 52 - lead plastic quad flatpack s - 52 ADUC844bs62 - 3 - 40 +125 2.75 3.60 62 kbytes 52 - lead plastic quad flatpack s - 52 ADUC844bcp62 - 5 - 40 +125 4.75 5.25 62 kbytes 56 - lead chip scale package s - 52 ADUC844bcp62 - 3 - 40 +125 2.75 3.60 62 kbytes 56 - lead chip scale package s - 52 ADUC844bcp32 - 5 - 40 +125 4.75 5.25 32 kb ytes 56 - lead chip scale package s - 52 ADUC844bcp32 - 3 - 40 +125 2.75 3.60 32 kbytes 56 - lead chip scale package s - 52 ADUC844bcp8 - 5 - 40 +125 4.75 5.25 8 kbytes 56 - lead chip scale package s - 52 ADUC844bcp8 - 3 - 40 +125 2.75 3.60 8 kbytes 56 - lead chip sc ale package s - 52 eval - ADUC844qs quickstart development system eval - ADUC844qs quickstart plus development system caution esd (electrostatic discharge) sensitive device. electrostatic charges as high as 4000v readily accumulate on the hum an body and test equipment and can discharge without detection. although the ADUC844 features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high - energy electrostatic discharges. therefore, proper esd precautions a re recommended to avoid performance degradation or loss of functionality. pin configuration 52 - lead mqfp a d u c 8 3 4 t o p v i e w ( n o t t o s c a l e ) p i n 1 i n d e n t i f i e r 1 13 14 26 40 52 27 39 56 - lead csp p i n 1 i n d e n t i f i e r 1 1 4 1 5 2 8 2 9 4 2 4 3 5 6 a d u c 8 3 4 t o p v i e w ( n o t t o s c a l e )
ADUC844 rev. prb - 9 - preliminary technical data pin function descriptions pin no: 52 - mqfp pin no: 56 - csp pin mnemonic type* description 1, 2 56, 1 p1.0/p1.1 i/o p1.0 and p1.1 can function as a digital inputs or digital outputs and have a pull - up configuration as described below for port 3. p1.0 and p1.1 have an increased current drive sink capability of 10ma. p1.0 and p1.1 also have various secondary functions as described below. p1.0/t2/pwm0 i/o p1.0 can also be us ed to provide a clock input to timer 2. when enabled, counter 2 is incremented in response to a negative transition on the t2 input pin. if the pwm is enabled, the pwm0 output will appear at this pin. p1.1/t2ex/pwm1 i/o p1.1 can also be used to provide a control input to timer 2. when enabled, a negative transition on the t2ex input pin will cause a timer 2 capture or reload event. if the pwm is enabled, the pwm1 output will appear at this pin. 3 4 9 12 2 3 11 14 p1.2 p1.7 i port 1.2 to port 1.7 have no digital output driver; they can function as a digital input for which ?0? must be written to the port bit. as a digital input, these pins must be driven high or low externally. these pins also have the following analog functionality: p1.2/dac/ie xc1 i/o the voltage output from the dac or one or both current sources (200 ua or 2 x 200 ua) can be configured to appear at this pin. p1.3/ain5/iexc2 i/o auxiliary adc input or one or both current sources can be configured at this pin. p1.4/ain1 i p rimary adc, positive analog input p1.5/ain2 i primary adc, negative analog input p1.6/ain3 i auxiliary adc input or muxed primary adc, positive analog input p1.7/ain4/dac i/o auxiliary adc input or muxed primary adc, negative analog input. the vol tage 5 4 avdd s analog supply voltage 6 5 agnd s analog ground. n/c 6 agnd s a second analog ground is provided with the csp version only. 7 7 refin - i external reference input, negative terminal 8 8 refin+ i external reference input, positive termina l 13 15 ss i the slave select input for the spi interface is present at this pin. a weak pull - up is present on this pin. 14 16 miso i master input/slave output for the spi interface. there is a weak pull - up on this input pin. 15 17 reset i reset input. a high level on this pin for 16 core clock cycles while the oscillator is running resets the device. there is an internal weak pull - down and a schmitt trigger input stage on this pin.
ADUC844 - 10 - rev. prb preliminary technical data pin no: 52 - mqfp pin no: 56 - csp pin mnemonic type* description 16 - 19 22 - 25 18 - 21 24 - 27 p3.0 p3.7 i/o p3.0 ? p3.7 are bi - directional port pins with internal pull - up resistors. port 3 pins that have 1s written to them are pulled high by the internal pull - up resistors, and in that state can be used as inputs. as inputs, port 3 pins being pulled externally low will source current because of the internal pull - up resistors. when driving a 0 - to - 1 output transition, a strong pull - up is active for two core clock periods of the instruction cycle. port 3 pins also have various se condary functions described below. 16 18 p3.0/rxd receiver data for uart serial port 17 19 p3.1/txd transmitter data for uart serial port 18 20 p3.2/int0 external interrupt 0. this pin can also be used as a gate control input to timer0. 19 21 p3.3/i nt1 external interrupt 1. this pin can also be used as a gate control input to timer1. 22 24 p3.4/t0/pwmclk timer/counter 0 external input if the pwm is enabled, an external clock may be input at this pin. 23 25 p3.5/t1 timer/counter 1 external input 24 26 p3.6/wr external data memory write strobe. latches the data byte from port 0 into an external data memory. 25 27 p3.7/rd external data memory read strobe. enables the data from an external data memory to port 0. 20, 34, 48 22, 36, 51 dvdd s digital supply voltage 21, 35, 47 23, 37, 50 dgnd s digital ground. 26 28 sclock i/o serial interface clock for either the i 2 c or spi interface. as an input, this pin is a schmitt - triggered input and a weak internal pull - up is present on this pin unless it is outputting logic low. this pin can also be directly controlled in software as a digital output pin. 27 29 mosi/sdata i/o serial data i/o for the i 2 c interface or master output/slave input for the spi interface. a weak internal pull - up is pre sent on this pin unless it is outputting logic low. this pin can also be directly controlled in software as a digital output pin. 28 31 36 39 30 32 38 42 p2.0 p2.7 i/o port 2 is a bidirectional port with internal pull - up resistors. port 2 pins that have 1s written to them are pulled high by the internal pull - up resistors, and in that state can be used as inputs. as inputs, port 2 pins being pulled externally low will source current because of the internal pull - up resistors. port 2 emits the high order address bytes during fetches from external program memory and middle and high order address bytes during accesses to the 24 - bit external data memory space. 32 34 xtal1 i input to the crystal oscillator inverter. 33 35 xtal2 o output from the crystal oscillator inverter. (see ?hardware design considerations? for description) 40 43 ea external access enable, logic input. when held high, this input enables the device to fetch code from internal program memory locations 0000h to f 7ffh. when held low this input enables the device to fetch all instructions from external program memory. to determine the mode of code execution, i.e., internal or external, the ea pin is sampled at the end of an external reset assertion or as part of a d evice power cycle. ea may also be used as an external emulation i/o pin and therefore the voltage level at this pin must not be changed during normal mode operation as it may cause an emulation interrupt that will halt code execution.
ADUC844 rev. prb - 11 - preliminary technical data pin no: 52 - mqfp pi n no: 56 - csp pin mnemonic type* description 41 44 psen program store enable, logic output. this output is a control signal that enables the external program memory to the bus during external fetch operations. it is active every six oscillator perio ds except during external data memory accesses. this pin remains high during internal program execution. psen can also be used to enable serial download mode when pulled low through a resistor at the end of an external reset assertion or as part of a devic e power cycle. 42 45 ale address latch enable, logic output. this output is used to latch the low byte (and page byte for 24 - bit data address space accesses) of the address to external memory during external code or data memory access cycles. it is activ ated every six oscillator periods except during an external data memory access. it can be disabled by setting the pcon.4 bit in the pcon sfr. 43 46 49 52 46 49 52 55 p0.0 p0.7 i/o p0.0 ? p0.7, these pins are part of port0 which is an 8 - bit o pen - drain bidirectional i/o port. port 0 pins that have 1s written to them float and in that state can be used as high impedance inputs. an external pull - up resistor will be required on p0 outputs to force a valid logic high level externally. port 0 is als o the multiplexed low - order address and data bus during accesses to external program or data memory. in this application it uses strong internal pull - ups when emitting 1s. *i = input, o = output, s = supply.
ADUC844 - 12 - rev. prb preliminary technical data detailed block diagram with pin numbers figure 1: detailed block diagram of the ADUC844
ADUC844 rev. prb - 13 - preliminary technical data memory7 organisation the ADUC844 contains 4 different memory blocks namely: - 62kbytes of on - chip flash/ee program memory - 4kbytes of on - chip flash/ee data memory - 256 bytes of general purpose ram - 2kbytes of internal xram (1) flash/ee program memory the ADUC844 provides 62kbytes of flash/ee program memory to run user code. the user can choose to run code from this internal memory or run code from an external program memory. if the user applies po wer or resets the device while the ea pin is pulled low externally, the part will execute code from the external program space, otherwise if ea is pulled high externally the part defaults to code execution from its internal 62kbytes of flash/ee program mem ory. the ADUC844 does not support the rollover from f7ffh in internal code space to f800h in external code space. instead the 2048 bytes between f800h and ffffh will appear as nop instructions to user code. permanently embedded firmware allows code to be serially downloaded to the 62kbytes of internal code space via the uart serial port while the device is in - circuit. no external hardware is required. 56kbytes of the program memory can be repogrammed during runtime hence the code space can be upgraded in t he field using a user defined protocol or it can be used as a data memory. this will be discussed in more detail in the flash/ee memory section of the datasheet. (2) flash/ee data memory 4kbytes of flash/ee data memory are available to the user and can be accessed indirectly via a group of registers mapped into the special function register (sfr) area. access to the flash/ee data memory is discussed in detail later as part of the flash/ee memory section in this data sheet. (3) general purpose ram the gene ral purpose ram is divided into two seperate memories, namely the upper and the lower 128 bytes of ram. the lower 128 bytes of ram can be accessed through direct or indirect addressing while the upper 128 bytes of ram can only be accessed through indirect addressing as it shares the same address space as the sfr space which can only be accessed through direct addressing. the lower 128 bytes of internal data memory are mapped as shown in figure 2. the lowest 32 bytes are grouped into four banks of eight reg isters addressed as r0 through r7. the next 16 bytes (128 bits), locations 20hex through 2fhex above the register banks, form a block of directly addressable bit locations at bit addresses 00h through 7fh. the stack can be located anywhere in the internal memory address space, and the stack depth can be expanded up to 2048 bytes. reset initializes the stack pointer to location 07 hex. any call or push pre - increments the sp before loading the stack. hence loading the stack starts from locations 08 hex which is also the first register (r0) of register bank 1. thus, if one is going to use more than one register bank, the stack pointer should be initialized to an area of ram not used for data storage. bit-addressable (bit addresses) four banks of e ight registers r0 r7 banks selected via bits i n psw 11 10 01 00 07h 0fh 17h 1fh 2fh 7fh 00h 08h 10h 18h 20h reset value o f stack pointer 30h general-purpose area figure 2. lower 128 bytes of internal data memory (4) internal xram the ADUC844 contains 2kbytes of on - chip extended data memory. this memory although on - chip is accessed via the movx instruction. the 2kbytes of internal xram are mapped into the bottom 2kbytes of the external add ress space if the cfg844.0 bit is set, otherwise access to the external data memory will occur just like a standard 8051. even with the cfg844.0 bit set access to the external xram will occur once the 24 bit dptr is greater than 0007ffh. external data memory space (24-bit address space) 000 000 h ffffffh cfg845 .0=0 external data memory space (24-bit address space) 000 000 h ffffffh cfg845 .0=1 0007f fh 000 800 h 2 kbyt es on-chip xram figure 3: internal and external xram when accessing the internal xram the p0, p2 port pins as well as the rd and wr strobes will not be output as per a standard 8051 movx instruction. this allows the user to use these port pins as standard i/o. the upper 1792 bytes of the internal xram can be configured to be used as an extended 11 - bit stack pointer. by default the stack will operate exactly like an 8052 in that it will rollover from ffh to 00h in the general purpose ram. on the ADUC844 how ever it is possible (by setting cfg844.7) to enable the 11 - bit extended stack pointer. in this case the stack will rollover from ffh in ram to 0100h in xram.
ADUC844 - 14 - rev. prb preliminary technical data the 11 - bit stack pointer is visable in the sp and sph sfrs. the sp sfr is located at 81h as with a standard 8052. the sph sfr is located at b7h. the 3 lsbs of this sfr contain the 3 extra bits necessary to extend the 8 - bit stack pointer into an 11 - bit stack pointer. upper 1792 bytes of on-chip xram (data +stack for exsp=1, data only for exsp=0) 256 bytes of on-chip data ram (data + stack) lower 25 6 bytes of on-chip xram (data only) 00h ffh 100 h 00h 07ffh cfg845.7 = 0 cfg845.7 = 1 figure 4. extended stack pointer operation external data memory (external xram) just like a standard 8051 compatible core the ADUC844 can access external data memory using a movx instruction. the movx instruction automatically outputs the various control strobes required to access the data memory. the aduc 844 however, can access up to 16mbytes of extrenal data memory. this is an enhancement of the 64kbytes external data memory space available on a standard 8051 compatible core. the external data memory is discussed in more detail in the ADUC844 hardware des ign considerations section. special function registers (sfrs) the sfr space is mapped into the upper 128 bytes of internal data memory space and accessed by direct addressing only. it provides an interface between the cpu and all on chip peripherals. a b lock diagram showing the programming model of the ADUC844 via the sfr area is shown in figure 5. all registers except the program counter (pc) and the four general - purpose register banks, reside in the sfr area. the sfr registers include control, configura tion, and data registers that provide an interface between the cpu and all on - chip peripherals. 128-byte special function register area 62 kbyte electrically reprogrammable nonvolatile flash/ee program memory 805 1- compatible core other on-chip peripherals temp sensor current sources 12-bit dac serial i/o wdt, psm tic, pll dual sigma-delta adcs 4 kbyt e electrically reprogrammable nonvolatile flash/ee dat a memory 256 bytes ram 2k xram figure 5. programming model accumulator sfr (acc) acc is the accumulator register and is used for math operations including a ddition, subtraction, integer multiplication and division, and boolean bit manipulations. the mnemonics for accumulator - specific instructions refer to the accumulator as a. b sfr (b) the b register is used with the acc for multiplication and division oper ations. for other instructions it can be treated as a general - purpose scratchpad register. data pointer (dptr) the data pointer is made up of three 8 - bit registers, named dpp (page byte), dph (high byte) and dpl (low byte). these are used to provide memor y addresses for internal and external code access and external data access. it may be manipulated as a 16 - bit register (dptr = dph, dpl), although inc dptr instructions will automatically carry over to dpp, or as three independent 8 - bit registers (dpp, dph , dpl). the ADUC844 supports dual data pointers. refer to the dual data pointer section later in this datasheet. stack pointer (sp and sph) the sp sfr is the stack pointer and is used to hold an internal ram address that is called the ?top of the stack.? the sp register is incremented before data is stored during push and call executions. while the stack may reside anywhere in on - chip ram, the sp register is initialized to 07h after a reset. this causes the stack to begin at location 08h. as mentioned earl ier the ADUC844 offers an extended 11 - bit stack pointer. the 3 extra bits to make up the 11 - bit stack pointer are the 3 lsbs of the sph byte located at b7h. to enable the sph sfr the
ADUC844 rev. prb - 15 - preliminary technical data exsp (cfg844.7) bit must be set otherwise the sph sfr cannot be read or w ritten to. program status word (psw) the psw sfr contains several bits reflecting the current status of the cpu as detailed in table i. sfr address d0h power on default value 00h bit addressable yes table i. psw sfr bit designations bit name description 7 cy carry flag 6 ac auxiliary carry flag 5 f0 general - purpose flag 4 rs1 register bank select bits 3 rs0 rs1 rs0 selected bank 0 0 0 0 1 1 1 0 2 1 1 3 2 ov overflow flag 1 f1 general - purpose flag 0 p parity bit the pcon sfr contains bits for powe r - saving options and general - purpose status flags as shown in table ii. sfr address 87h power on default value 00h bit addressable no table ii. pcon sfr bit designations bit name description 7 smod double uart baud rate 6 seripd spi power - down interrupt enable 5 int0pd int0 power - down interrupt enable 4 aleoff disable ale output 3 gf1 general - purpose flag bit 2 gf0 general - purpose flag bit 1 pd power - down mode enable 0 idl idle mode enable the cfg844 sfr contains the necessary bits to configure the inte rnal xram and the extended sp. by default it configures the user into 8051 mode. i.e. extended sp is disabled, internal xram is disabled. sfr address afhh power on default value 00h bit addressable no table iii. cfg844 sfr bit designations bit name descri ption 7 exsp extended sp enable if this bit is set then the stack will rollover from sph/sp = 00ffh to 0100h. if this bit is clear then the sph sfr will be disabled and the stack will rollover from sp=ffh to sp =00h 6 ---- ---- 5 ---- ---- 4 ---- ---- 3 ---- ---- 2 ---- ---- 1 ---- ---- 0 xramen xram enable bit if this bit is set then the internal xram will be mapped into the lower 2kbytes of the external address space. if this bit is clear then the internal xram will not be accessible and the external data memory will be mapped into the lower 2kbytes of external data memory. (see figure 3)
ADUC844 - 16 - rev. prb preliminary technical data complete sfr map figure 5 below shows a full sfr memory map and the sfr contents after reset. not used indicates u noccupied sfr locations. unoccupied locations in the sfr address space are not implemented; i.e., no register exists at this location. if an unoccupied location is read, an unspecified value is returned. sfr locations that are reserved for future use are s haded (reserved) and should not be accessed by user software. figure 6: complete sfr map * ca libr atio n co effi cien ts a re p reco nfi gure d at pow er-u p to fac tory cal ibr ated val ues. ie0 8 9 h 0 it0 8 8 h 0 tc o n 8 8 h 0 0 h bit m nemo nic bit bit address mne mo ni c rese t de fau lt v alue sfr add res s these bi ts are containe d in th is byte. rese t d efau lt bit val ue sfr map key: sfr n ote: sfrs whos e ad dres ses end i n 0h or 8h a re b it-ad dres sabl e. (1) th ese sf rs mai ntain their pre-r eset v alues after a res et if timeco n.0=1 .
ADUC844 rev. prb - 17 - preliminary technical data introduction the ADUC844 is a pin compatible upgrade to the aduc834 provide increased core performance. the ADUC844 has a single cycle 8052 core allow operatio n at up to 12.58mips. it has all the same features as the aduc834 but the standard 12 - cycle 8052 core has been replaced with a 12.6mips single cycle core. since the ADUC844 and aduc834 share the same feature set only the differences between the two chips are documented here. for full documentation on the aduc834 please consult the datasheet available at http://www.analog.com/microconverter 8052 instruction set the following pages document the number of clock cycles required for each instruction. most inst ructions are executed in one or two clock cycles resulting in 12.6mips peak performance when operating at pllcon = 00h. timer operation timers on a standard 8052 increment by one with each machine cycle. on the aduc842 one machine cycle is equal to one cl ock cycle hence the timers will increment at the same rate as the core clock. ale the output on the ale pin on the aduc834 was a clock at 1/6th of the core operating frequency. on the ADUC844 the ale pin operates as follows. for a single machine cycle in struction: ale is high for the first half of the machine cycle and low for the second half. the ale output is at the core operating frequency.for a two or more machine cycle instruction: ale is high for the first half of the first machine cycle and then lo w for the rest of the machine cycles. external memory access there is no support for external program memory access on the ADUC844. when accessing external ram the ewait register may need to be programmed in order to give extra machine cycles to movx comm ands. this is to account for differing external ram access speeds. instruction table table iv: optimized single cycle 8051 instruction set mnemonic arithmetic description bytes cycles arithmetic add a,rn add register to a 1 1 add a,@ri add ind irect memory to a 1 2 addc a,rn add register to a with carry 1 1 addc a,@ri add indirect memory to a with carry 1 2 add a,dir add direct byte to a 2 2 add a,#data add direct byte to a with carry 2 2 subb a,rn subtract register from a with borrow 1 1 subb a,@ri subtract indirect memory from a with borrow 1 2 subb a,dir subtract direct from a with borrow 2 2 subb a,#data subtract immediate from a with borrow 1 1 inc a increment a 1 1 inc rn increment register 1 1 inc @ri increment indirect memory 1 2 inc dir increment direct byte 2 2 inc dptr increment data pointer 1 3 dec a decrement a 1 1 dec rn decrement register 1 1 dec @ri decrement indirect memory 1 2 dec dir decrement direct byte 2 2 mul ab multiply a by b 1 9 div ab div ide a by b 1 9 da a decimal adjust a 1 2
ADUC844 - 18 - rev. prb preliminary technical data mnemonic arithmetic description bytes cycles logic anl a,rn and register to a 1 1 anl a,@ri and indirect memory to a 1 2 anl a,dir and direct byte to a 2 2 anl a,#data and immediate to a 2 2 anl d ir,a and a to direct byte 2 2 anl dir,#data and immediate data to direct byte 3 3 orl a,rn or register to a 1 1 orl a,@ri or indirect memory to a 1 2 orl a,dir or direct byte to a 2 2 orl a,#data or immediate to a 2 2 orl dir,a or a to direct byte 2 2 orl dir,#data or immediate data to direct byte 3 3 xrl a,rn exclusive - or register to a 1 1 xrl a,@ri exclusive - or indirect memory to a 2 2 xrl a,#data exclusive - or immediate to a 2 2 xrl dir,a exclusive - or a to direct byte 2 2 xrl a, dir exclusive - or indirect memory to a 2 2 xrl dir,#data exclusive - or immediate data to direct 3 3 clr a clear a 1 1 cpl a complement a 1 1 swap a swap nibbles of a 1 1 rl a rotate a left 1 1 rlc a rotate a left through carry 1 1 rr a ro tate a right 1 1 rrc a rotate a right through carry 1 1 boolean clr c clear carry 1 1 clr bit clear direct bit 2 2 setb c set carry 1 1 setb bit set direct bit 2 2 cpl c complement carry 1 1 cpl bit complement direct bit 2 2 anl c,bit and direct bit and carry 2 2 anl c,/bit and direct bit inverse to carry 2 2 orl c,bit or direct bit and carry 2 2 orl c,/bit or direct bit inverse to carry 2 2 mov c,bit move direct bit to carry 2 2 mov bit,c move carry to direct bit 2 2
ADUC844 rev. prb - 19 - preliminary technical data mnemonic arithmetic description bytes cycles branching jmp @a+dptr jump indirect relative to dptr 1 3 ret return from subroutine 1 4 reti return from interrupt 1 4 acall addr11 absolute jump to subroutine 2 3 ajmp addr11 absolute j ump unconditional 2 3 sjmp rel short jump (relative address) 2 3 jc rel jump on carry = 1 2 3 jnc rel jump on carry = 0 2 3 jz rel jump on accumulator = 0 2 3 jnz rel jump on accumulator != 0 2 3 djnz rn,rel decrement register, jnz relati ve 2 3 ljmp long jump unconditional 3 4 lcall addr16 long jump to subroutine 3 4 jb bit,rel jump on direct bit = 1 3 4 jnb bit,rel jump on direct bit = 0 3 4 jbc bit,rel jump on direct bit = 1 and clear 3 4 cjne a,dir,rel compare a, direc t jne relative 3 4 cjne a,#data,rel compare a, immediate jne relative 3 4 cjne rn,#data,rel compare register, immediate jne relative 3 4 cjne @ri,#data,rel compare indirect, immediate jne relative 3 4 djnz dir,rel decrement direct byte, jnz rel ative 3 4 miscellaneous nop no operation 1 1 notes: 1. one cycle is one clock. 2. cycles of movx instructions are 4 cycles when they have 0 wait state. cycles of movx instructions are 4+n cycles when they have n wait states. 3. cycles of lcall in struction are 3 cycles when the lcall instruction comes from interrupt.
ADUC844 - 20 - rev. prb preliminary technical data

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