POP DPH ;SP=51H
POP DPL ;SP=50H
MOV DPTR,#4000H ;DPTR=#4000H
RL A ;A=04H(02H*2)
MOV B,A ;B=04H
MOVC A,@A+DPTR ;查表A=30H //这里怎么得出A=30H?
PUSH A ;SP=51H,(51H)=#30H //这里为什么SP=51H?然后(51H)=#30H又是怎么得出的?
MOV A,B ;A=04H
INC A ;A=05H
MOVC A,@A+DPTR ;查表A=50H
PUSH A ;SP=52H,(52H)=#50H
RET
ORG 4000H
DB 10H,80H,30H,50H,30H,50H