下列 程序段实现图中IN4的1次A/D转换,转换结果保存在AL寄存器中。
A、MOV AL,04H MOV DX,0348H OUT DX,AL MOV DX,0349H AA: IN AL,DX TEST AL,08H JZ AA MOV DX,0348H IN AL,DX HLT
B、MOV DX,0348H OUT DX,AL MOV DX,0349H AA: IN AL,DX TEST AL,08H JZ AA MOV DX,0348H IN AL,DX HLT
C、MOV AL,04H MOV DX,0348H OUT DX,AL MOV DX,0349H AA: IN AL,DX TEST AL,10H JZ AA MOV DX,0348H IN AL,DX HLT
D、MOV AL,04H MOV DX,0348H OUT DX,AL MOV DX,0349H AA: IN AL,DX TEST AL,08H JNZ AA MOV DX,0348H IN AL,DX HLT