比如非压缩BCD码存在30H，31H，32H，转换后存在33H，34HBCDCH: MOV A,31H SWAP A ANL A,#0F0H MOV B,A MOV A,32H ANL A,#0FH ORL A,B MOV 33H,A MOV A,30H ANL A,#0FH MOV 34H,A RET
