PPPP: MOV P0M1, #00H ;P1.2.3口设置为准双向口
MOV P0M2, #00H
ANL P1M1, #20H ==>P1.2为KEY,原来设置为开漏,这里设置除P1.5以外为准双向口是什么意思?
ANL P1M2, #20H ==>是不是程序写错了?
MOV P2M1, #00H
MOV P2M2, #00H
ANL P3M1, #0FCH
ANL P3M2, #0FCH
MOV P0, #0FFH
MOV P1, #0FFH
MOV P2, #0FFH
MOV P3, #0FFH
ORL PCONA, #0EFH
还是就是按理说应该是仅为输入最省电吧
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