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w541c20x data sheet 4-bit microcontroller publication release date:november 06, 2009 - 1 - revision a6 1. general description the w541c20x is fully compatible with w741c20x in the terms of pin assignment and ic functon. it is a high-performance 4-bit microcontroller ( c) that operates on very low current. the device contains a 4-bit alu, two 8-bit timers, a divider, a serial port, and five 4-bit i/o ports (including 3 output ports for led driving). there are also seven interrupt s ources and 8-level subroutine nesting for interrupt applications. the w541c20x has two power reduc tion modes, hold mode and stop mode, which help to minimize power dissipation. the w541c20x is suitable for remote controllers , toy controllers, key board controllers, speech synthesis lsi controlle rs, and other products. 2. features ? operating voltage: 2.4v to 5.5v ? single system clock ? oscillation frequency up to 4 mhz , crystal or rc oscillator is selected by mask code option ? high-frequency (400 khz to 4 mhz) or low-frequency (32.768 khz) osc illation is delected by mask code option ? memory ? 2048 x 16 bit program rom (including 2k x 4 bit look-up table) ? 128 x 4 bit data ram (including 16 working registers) ? 21 input/output pins ? input/output ports: 4 ports/16 pins ? serial input/output port: 1 port /4 pins (high sink current for led driving) ? mfp output pin: 1 pin (mfp) ? do not be floating when it is as input or output open-drain (nmos type). ? power-down mode ? hold function: no operation (except for oscillator) ? stop function: no operation (including oscillator) ? seven types of interrupts ? five internal interrupts (divider 0, timer 0, timer 1, and serial i/o) ? two external interrupts (port rc and int pin) ? mfp output pin ? output is software selectable as modulating or nonmodulating frequency ? works as frequency output specified by timer 1
w541c20x publication release date: november 06, 2009 - 2 - revision a6 ? built-in 14-bit clock frequency divider circuit ? two built-in 8-bit programmable countdown timers ? timer 0: one of two internal clock frequencies (f osc /4 or f osc /1024) can be selected ? timer 1: offers auto-reload function, and one of two internal clock frequencies (f osc or f osc /64) can be selected, or falling edge of pin rc.0 can be selected (output through mfp pin) ? built-in 18/14-bit watchdog timer selectable for system reset ? powerful instruction set: 118 instructions ? 8-level subroutine (include interrupt) nesting ? one serial transmission/receiver port specified by software ? up to 1 s instruction cycle (with 4 mhz operating frequency) ? packaged in 18-pin, 20-pin, 28-pin pdip and 20-pin, 28-pin sop
w541c20x 3. block diagram xin xout pc stack (8 levels) ram (128*4) alu timer 0 (8-bit) timing generator port ra port rb modulation frequency pulse ra0 to 3 rb0 to 3 re0 to 3 mfp vdd vss rom (2048*16) (look_up table 2k*4) timer 1 (8-bit) acc res int divider 0 (14-bit) watchdog timer (4-bit) hcf pef hef ief central control unit evf sef psr0 .. mux sel +1(+2) . port rc rc0 to 3 port rd rd0 to 3 pr pm0 mr0 psr1 psr2 port rt serial i/o mux (re0/dout, re1/clko, re2/din, re3/clki) sel publication release date: november 06, 2009 - 3 - revision a6
w541c20x 4. pin configurations 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 rb3 rb2 rb1 ra1 ra0 xin xout rc3 rc2 rc1 res int ra3 ra2 rb0 rc0 20 21 22 23 24 25 26 27 28 1 2 3 4 5 6 7 8 9 re3 re2 re1 ra1 ra0 xin xout rd3 rd2 rd1 res int ra3 ra2 re0 rd0 19 10 rb0 rc3 16 17 18 11 12 13 rb3 rb2 rb1 rc2 rc1 rc0 15 14 nc mfp w541c201 w541c202/c205 18-pdip(300 mil) 28 skinny(300 mil), 28 sop v ss v dd v ss v dd 10 11 12 13 15 16 17 18 1 2 3 4 5 6 7 8 9 rb3 rb2 rb1 ra1 ra0 xin xout rc3 rc2 rc1 ra3 ra2 rb0 rc0 w541c203 20-pdip(300 mil) 14 19 20 10 11 12 13 15 16 17 18 1 2 3 4 5 6 7 8 9 rb3 rb2 rb1 ra1 ra0 xin xout rc3 rc2 rc1 res int ra3 ra2 rb0 rc0 w541c204 20 sop 14 19 20 int res v ss v ss v dd v dd v ss v ss v dd v dd publication release date: november 06, 2009 - 4 - revision a6
w541c20x 5. pin description symbol i/o function xin i input pin for oscillator. connected to crystal or resistor to generate system clock by code option. external 10~20pf capacitor uses to get accurate freq in crystal mode. xout o output pin for oscillator. connected to crystal or resistor to generate system clock by code option. 20pf capacitor is built in internal for crystal mode. ra0 ? ra3 i/o input/output port. input/output mode s pecified by port mode 1 register (pm1). when used as output port, can pr ovide high sink current for driving led. rb0 ? rb3 i/o input/output port. input/output mode s pecified by port mode 2 register (pm2). when used as output port, can pr ovide high sink current for driving led. rc0 ? rc3 i/o input/output port. input/output mode s pecified by port mode 4 register (pm4). each pin has an independent interrupt capability in input mode. and build-in schmitt trigger. rd0 ? rd3 i/o input/output port. input/output mode s pecified by port mode 5 register (pm5). re0/dout re1/clko re2/din re3/clki i/o special input/output port. this port can be configured by software to act as the output of internal port rt or the serial i/o port. when used as output port, can provide high sink current for driving led. mfp o output pin only. this pin can output modulating or nonmodulating frequency, or timer 1 clock output spec ified by mode register 1 (mr1). int i external interrupt pin with pull-high resistor. res i system reset pin with pull-high resistor. v dd i positive power supply (+). v ss i negative power supply (-). publication release date: november 06, 2009 - 5 - revision a6
w541c20x publication release date: november 06, 2009 - 6 - revision a6 6. electrical characteristics 6.1 absolute maximum ratings parameter rating unit supply voltage to ground potential -0.3 to +7.0 v applied input/output voltage -0.3 to +7.0 v power dissipation 120 mw ambient operating temperature 0 to +70 c storage temperature -55 to +150 c note: exposure to conditions beyond those listed under absolute maximum ratings may adversely affect the life and reliability of the device. 6.2 dc characteristics (v dd -v ss = 3.0v, fosc. = 32.768 khz, ta = 25 c; unless otherwise specified) parameter sym. conditions min. typ. max. unit op. voltage v dd - 2.4 - 5.5 v op. current (crystal type) i op1 no load (ext-v) - 8 20 a op. current (rc type) i op2 no load (ext-v) - 35 65 a hold current (crystal type) i hm1 hold mode no load (ext-v) - 4 6 a hold current (rc type) i hm2 hold mode no load (ext-v) - 16 40 a stop current (crystal type) i sm1 stop mode no load (ext-v) - 0.1 2 a stop current (rc type) i sm2 stop mode no load (ext-v) - 0.1 2 a input low voltage v il - v ss - 0.3 v dd v input high voltage v ih - 0.7 v dd - v dd v mfp output low voltage v ml i ol = 2.7 ma - - 0.4 v mfp output high voltage v mh i oh = -3.5 ma 2.4 - - v port ra, rb sink current i abl v ol = 0.9v 7.5 - - ma port ra, rb source current i abh v oh = 2.4v 0.4 1.2 - ma
w541c20x port rc, rd output low voltage v cdl i ol = 2.0 ma - - 0.4 v port rc, rd output high voltage v cdh i oh = -2.0 ma 2.4 - - v 6.3 dc characteristics, continued parameter sym. conditions min. typ. max. unit port re sink current i el v ol = 0.9v 7.5 - - ma port re source current i eh v oh = 2.4v 0.4 1.2 - ma in t pull-up resistor r int - 50 250 1000 k din pin pull-up resistor r din re.2 used as serial input pin 50 250 1000 k res pull-up resistor r res - 20 100 500 k 6.4 ac characteristics (v dd -v ss = 3.0 v, ta = 25 c; unless otherwise specified) parameter sym. conditions min. typ. max. unit rc type - - 4000 op. frequency f osc crystal type 1 (option low speed type) - 32.768 - khz crystal type 2 (option high speed type) 400 - 3580 frequency deviation by voltage drop for rc oscillator f f f(3v) - f(2.4v) f(3v) - - 10 % instruction cycle time t i one machine cycle - 4/f osc - ms serial port data ready time t dr - 200 - - ns serial port data hold time t dh - 200 - - ns reset active width t raw f osc = 32.768 khz 1 - - s interrupt active width t iaw f osc = 32.768 khz 1 - - s publication release date: november 06, 2009 - 7 - revision a6
w541c20x 7. application circuit mfp int res xout xin rc2 rc3 ra0 ra3 output signal rb0 rb1 rb2 rb3 rc0 rc1 rd0 rd1 rd2 rd3 re0 re1 re2 re3 or vcc vcc vcc v dd v ss vcc vcc *1(option) note : *1 is for accuracy publication release date: november 06, 2009 - 8 - revision a6
w541c20x 8. package dimensions 8.1 18-lead pdip-300mil 1.63 1.47 0.064 0.058 symbol min. nom max. max. nom min. dimension in inches dimension in mm a b c d e a l s a a 1 2 e 0.060 1.52 0.175 4.45 0.010 0.125 0.016 0.130 0.018 0.135 0.022 3.18 0.41 0.25 3.30 0.46 3.43 0.56 0.008 0.120 0.375 0.010 0.130 0.014 0.140 0.20 3.05 0.25 3.30 0.36 3.56 0.255 0.250 0.245 6.48 6.35 6.22 9.53 7.62 7.37 7.87 0.300 0.290 0.310 2.29 2.54 2.79 0.090 0.100 0.110 b 1 1 e e 1 0.900 0.910 22.86 23.11 01 5 0.055 1.40 0.355 0.335 8.51 9.02 15 0 seating plane a e 2 a c e base plane 1 a 1 e l a s 1 e d 1 b b 18 10 1 9 1 1 publication release date: november 06, 2009 - 9 - revision a6
w541c20x 8.2 20-lead pdip 1.63 1.47 0.064 0.058 symbol min. nom max. max. nom min. dimension in inches dimension in mm a b c d e a l s a a 1 2 e 0.060 1.52 0.175 4.45 0.010 0.125 0.016 0.130 0.018 0.135 0.022 3.18 0.41 0.25 3.30 0.46 3.43 0.56 0.008 0.120 0.375 0.010 0.130 0.014 0.140 0.20 3.05 0.25 3.30 0.36 3.56 0.255 0.250 0.245 6.48 6.35 6.22 9.53 7.62 7.37 7.87 0.300 0.290 0.310 2.29 2.54 2.79 0.090 0.100 0.110 b 1 1 e e 1 1.026 1.040 20.06 26.42 01 5 0.075 1.91 0.355 0.335 8.51 9.02 15 0 seating plane a e 2 a c e base plane 1 a 1 e l a s 1 e d 1 b b 20 11 0 11 1 1 publication release date: november 06, 2009 - 10 - revision a6
w541c20x 28-lead p-dip skinny 1.63 1.47 0.064 0.058 symbol min. nom max. max. nom min. dimension in inches dimension in mm a b c d e a l s a a 1 2 e 0.060 1.52 0.175 4.45 0.010 0.125 0.016 0.130 0.018 0.135 0.022 3.18 0.41 0.25 3.30 0.46 3.43 0.56 0.008 0.120 0.370 0.010 0.130 0.014 0.140 0.20 3.05 0.25 3.30 0.36 3.56 0.293 0.288 0.283 7.44 7.32 7.19 9.40 7.87 7.62 8.13 0.310 0.300 0.320 2.29 2.54 2.79 0.090 0.100 0.110 b 1 1 e e 1 a 1.388 1.400 35.26 35.56 0 15 0.055 1.40 0.350 0.330 8.38 8.89 15 0 e a a c e 1 e d 28 15 1 14 a base plane mounting plane 1 a 1 e l a s 1 b b 2 publication release date: november 06, 2009 - 11 - revision a6
w541c20x 8.3 20-lead sop-300mil l o c e h a1 a e b d seating plane y 0.25 gauge plane e 1 20 11 10 7.60 0.32 0.51 0.30 e c b a1 7.40 0.23 0.33 0.10 0.299 0.013 0.020 0.012 0.291 0.009 0.013 0.004 max. dimension in mm 2.65 a symbol min. 2.35 dimension in inches 0.104 min. 0.093 max. control demensions are in milmeters . 1.27 0.10 10.65 l q y h 08 0.40 10.00 e 1.27 bsc 0.050 0.004 0.419 0 0.016 0.394 8 0.050 bsc e d 12.60 13.00 0.496 0.512 publication release date: november 06, 2009 - 12 - revision a6
w541c20x 28-lead sop-300mil l o c e h a1 a e b d seating plane y 0.25 gauge plane e 1 28 15 14 7.60 0.32 0.51 0.30 e c b a1 7.40 0.23 0.33 0.10 0.299 0.013 0.020 0.012 0.291 0.009 0.013 0.004 max. dimension in mm 2.65 a symbol min. 2.35 dimension in inches 0.104 min. 0.093 max. control demensions are in milmeters . 1.27 0.10 10.65 l q y h 08 0.40 10.00 e 1.27 bsc 0.050 0.004 0.419 0 0.016 0.394 8 0.050 bsc e d 17.70 18.10 0.697 0.713 publication release date: november 06, 2009 - 13 - revision a6
w541c20x 9. revision history version date description a2 - note: update hi freq range from 4.19 3.58mhz (c200) a3 - note: rc is built-in schmitt trigger a4 may 29, 2003 note: do not be floating when it is as input or output open-drain (nmos type) a5 june 22, 2005 note: add important notice a6 november 06, 2009 note: logo change important notice nuvoton products are not designed, intended, authorized or warranted for use as components in systems or equipment intended for surgi cal implantation, atomic energy control instruments, airplane or spaceship instrument s, transportation instruments, traffic signal instruments, combustion control instruments, or for other applications intended to support or sustain life. further more, nuvoton products are not intended for applications wherein failure of nuvoton products could result or lead to a situation wherein personal injury, death or severe property or environmental damage could occur. nuvoton customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify nuvoton for any damages resulting from such improper use or sales. publication release date: november 06, 2009 - 14 - revision a6

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