2 AIAODIDO 2.1 DIDO 01

2.1.1 74LS244 MOV DX, port IN AL,DX

MOV DX, 00H IN AL,DX

74LS273 IOW MOV AL,DATA MOV DX, port OUT DX,DL

MOV AL,DATA MOV DX, 00H OUT DX,DL

P C 2.1.2

AOAOOA1

RS RS 1 0

P C 2.1.3 1

2

MC14167

2.2 A/D A/D ADC08098AD57412 MC1443311ICL713514 Flash ADC -1bit DAC+

A/D n LSB1/2n. 1/2LSB1LSB

2.2.1 A/D 8A/DADC0809 88A/D 100us, 1/2LSB

8 ALE

START EOC VREF(+)=5.12V, VREF(-)=0V

CBA000VIN0001VIN1

111VIN7

12A/DAD547A 12A/D 25us, 1/2LSB 10V20V

BIP OFF0V BIP OFF10V

12/8=1D11-D0 12/8=0D11-D8D7-D0

CECSR/C12/8A0100X0121000181011X121010081010140XXXXX1XXX

STS STS

2.2.2 A/D ADC08098255A 8255AA0 A C PC0-PC2 ABC PC3 ALESTART PC7 OEEOC 8255A2C0H~2C3H

ADC0809PROC NEAR MOV CX,8; CLD; DI MOV BL,00H ; LEA DI,DATABUF NEXTA: MOV DX,02C2H MOV AL,BL OUT DX,AL INC DX MOV AL,00000111B NOP NOP NOP MOV AL,00000110B, ALE, START

OUT DX,AL DEC DX NOSC:IN AL, DX; TEST AL,80H JNZ NOSC; EOC=1, EOC NOEOC: IN AL, DX; TEST AL,80H JZ NOSC; EOC=0, EOC MOV DX,02C0H; IN AL,DX STOS DATABUF; INC BL; LOOP NEXTACX-1; RET ADC0809 ENDP

AD5748255A AD57412/85VA012 8255AAB0 C PC0-PC2 R/CCSCE PC7 STS 8255A2C0H~2C3H

MOV DX,02C2H; CS,R/C MOV AL,00H OUT DX,AL NOP NOP MOV AL,04H CE=1, OUT DX,AL NOP NOP MOV AL,03HCE=0CS, R/C1 OUT DX,AL POLLING:IN AL,DX; STS TEST AL,80H JNZ POLLING; STS=1 MOV AL,01HCS0,R/C1,

OUT DX,AL NOP MOV AL,05H; CE=1, OUT DX,AL MOV DX,02C0H IN AL,DX ; 4DB11-DB8; AND AL, 0FH MOV BH,AL4 INC DX IN AL,DX 8DB7-DB0 MOV BL,AL INC DX MOV AL,03HOUT DX,AL;

P62 2.1, 2.2, 2.3

2 2.3 010mA420mA

2.3.1

2.3.2 I/V DDZ-010mA DDZ-,DDZ-S420mA I/V 010mA:R1 100 R2 500 05V 420mA:R1 100 R2 250 15V

I/V 010mA:R1 200 R3 100k R4 150k 05V 420mA:R1 200 R3 100k A=1+R4/R3 R4 25k 15V

2.3.3 0 CD40518 INH

2.3.4 T K

fmaxf 2 fmax > A/DLSB q=(ymax-ymin)/(2n-1) 1/2q

tA/DA/D

A/D t=KTA/D KCHVOUTVIN KVOUTVC

LF398 8 CH CH0.01uF, 25us

2.3.5 AD547A, LF398, CD4051,8255A 8 12A/D25us)010V ->PC0-PC2, ->PC3 LF398->ADC547STS+ AD547AR/C, CS, CE ->PC4-PC6 STS->PA7 4->PA0-PA38->B

AD574APROC NEAR CLD LEA DI,BUF MOV BL,00000000B; CECS, R/C, INH=0, MOV CX,8 ADC:MOV DX,2C2H ; C MOV AL,BL OUT DX,AL; STS=0, LF398 NOP NOP OR AL,01000000B CE=1, A/D OUT DX,AL AND AL,10111111B CE=0, OUT DX,AL MOV DX,2C0H; A

PULLINGIN AL,DX STS TEST AL,80H JNZ PULLING STS1LF398 MOV AL,BL OR AL,00010000B; R/C1 MOV DX,2C2H; OUT DX,AL OR AL,01000000B; CE, R/C1 MOV DX,2C0H ; A4 IN AL,DX AND AL,0FH MOV AH,AL 4AH INC DX; B8 IN AL,DX 8AL STOSW;

INC BL; LOOP ADC MOV AL,00111000B; CE=0CS, R/C, INH=1, MOV DX,2C2H OUT DX,AL RET AD574A ENDP

2.4 D/A D/A D/A 1/2LSB D/A

1 bit D/A()

2.4.1 D/A 8D/AADC0832 8D/A

DAC LE1LE2 DI0-DI7 IOUT1,IOUT2 IOUT1+IOUT2=C

ILE WR1 WR2DAC XFERDAC XFER WR2D/A DAC RfbVREF DAC0832 XFER WR2 ILE WR1I/OCS 2

12D/ADAC1210 12D/A

DAC LE BYTE1/BYTE2 DI0-DI11 DI0-DI34 DACLE QDDAC DAC WR1,WR2,CS,XFER ,Rfb,VREFDAC0832

2.4.2 D/A DAC0832XT DAC0832 1. +IOW-> CS -> LE1 -> -> D/A 2. IOW-> CS -> LE1 -> -> D/A

300H MOV DX,300H MOV AL,7FH OUT DX,AL HLT IOUT1,IOUT20

DAC1210XT 300H301H302H Y0 Y1 Y2DAC CS 8XTD0-D7 4XTD4-D7 ,

1. 8Y0-> BYTE1/BYTE2 -> IOW -> D0-D7 8 D4-D7 4 2.4 Y1-> BYTE1/BYTE2 -> IOW -> D4-D7 4 3.DAC Y2-> XFER -> IOW -> DACD/A

4. DAC D/A Y2, IOW ->DACD/A MOV DX,300H; Y0 MOV AL,83H 8 OUT DX,AL MOV DX,301H; Y1 MOV AL,0F0H 4 OUT DX,AL MOV DX,302HY2 OUT DX,AL D/A HLT