? ? c "%$a%"$¤ g  "%D ¤ g  %"D ¤ g  "%D ¤ g 1 9.1.1 "?"%D  "%$ sO q1ê úl?-4# ?7è μ íi e?￥ ^ { ?  E 71 V íi ? ? { {D55-è üY ? ?{1 N8 ?Aé? ,?? ??? Hò ? qS?jL)[ ??D HW,)[?VT IN0 IN1 IN7  ^  D 7 1 D0-D7 VCC GND REF+ ALE START EOC CLK OE REF- A B AD ? D2 ??|" 12 ? Hò { ? e? yTèaa1 1? íi ? Ièa  E { ?1? C 9.1.2 "%$D? ? ?¤ Q?Z T PINT1 MOV DPTR,#7FF8H MOVX A,@DPTR ; AD ? MOV 30H,A MOV A,#00H ; ? AD MOVX @DPTR, A RETI INIT1: SETB IT1 ;H(? SETB EA SETB EX1 MOV DPTR,#7FF8H ;IN01? MOV A,#00H MOVX @DPTR, A ; ? AD SJMP $ ADC0809 P0.0~7 ?1 ?1 1 MCS-51 8 3 IN 0j7 D CK Q Q G QD ALE INT1 WR P2.7 RD CLK EOC ALE START OE D0~D7 8 A B C  %"D ¤ g  %"De ? Oê ?3 D  E ￥1" T 7 0 7 3&'  O ?% 7 3&'  ? Ièa %"$ê ?? 2￥%"D e ? m ?3 8ê DAC DAC 7i  { ? íi  - + I OUT2 I OUT1 R VER V O D 0j7 AGND CS I LE & & & WR1 WR2 XFER R fb DGND Vcc 9.2.2 DAC 0832D? ? ?¤ D7 | CS XFER WR1 WR2 DGND I OUT1 I OUT2 R FB I LE V CC V REF 5V AGND 1K 1M V O P2.7 P0 WR GND 89C51 5V D0 DAC0832  ?? Z T  { ?7i ?%"$7i M?￥ e? ?|??sY ?B  P ? °¤ ?%"$7i  ?'é?%" D ?? f ?/ { ? íi ?  íiT ¨bNZ T a¨?oμB ^  E  {μ+ ^  E  {?i?1 p ]?￥"db / ????BQ%" MOV DPTR, #7FFFH MOV A , #data MOVX @DPTR , A   ?? Z T  { ?7i ?%"$7i s ￥μò1￥1? VsYê Y¨] H { ^  E? |b ??  ^%"]? {￥?? MOV DPTR, #0DFFFH ; í ? ch1 MOV A, #data1 MOVX @DPTR, A MOV DPTR, #0BFFFH ; í ? ch2 MOV A, #data2 MOVX @DPTR, A MOV DPTR, #7FFFH ] H DA MOVX @DPTR, A P2.5 P0 WR GND 89C51 D7 | CS XFER WR1 WR2 DGND IOUT1 IOUT2 R FB I LE V CC V REF 5V AGND 1K 1M V O 5V D0 D7 | CS XFER WR1 WR2 DGND R FB ILE V CC V REF 5V AGND 1K 1M V 1 5V D0 P2.6 P2.7 IOUT2 IOUT1  °YyTZ T | ?μ%"$? ?￥ e? ?¤B i¤?è ü* -& ¤úè ü5 ? B? { ?ü°¤é ?%"$7i é?%"Db D7 | CS XFER WR1 WR2 DGND I OUT1 I OUT2 R FB I LE V CC V REF 5V AGND 1K 1M V O P0 GND 89C51 -5V D0 DAC0832 P2.7 è D/AD??¨ DAC 0832 { 0j5V o è ^1°YZ T b ! V REF = - 5VDAC 08321?1 7FFFH ?  ? ù1 p1 100msb %"$4.07 %153''')  *01? .07 "  7 S {7 %"$-.079 !%153"  {  E  */$ "  6a "$"-- %&-":  ü HNT "+.1 %"$-  ?? { … 100ms