Interface circuit diagram of 12 AD574s and 8088CPU Dave Ross Blog

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AD574 interface circuit

Interface circuit diagram of Fig. 4.27 12 AD574s and 8088CPU
Start A/D to change and adopt and inquire about the way, gather the machine format procedure as follows:
MOV DX,278H
OUT DX,AL; Start and change, R/C =0, electrical laboratory equipment CS =0, CE =1,A0 =0
MOV DX,27AH; Set up the address of three-state gate
AA1: IN AL,DX; Read STS state
TEST AL,80H; Test STS level
JNE AA1; STS voltage transformer =1 waits, STS =0 is carried out downward
MOV DX,278H
IN AL,DX; Read 8 data, R/C high =1,CS =0,CE =1,A0 =1,CE =1
MOV AH,AL; Keep 8 data high
MOV DX,279H
IN AL,DX; Read 4 data, R/C low =1,CS =0,A0 =1,CE =1

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