利用8051单片机串行口串并转换输出程序

;利用8051串行口，和并行输出串行移位寄存器74LS164，
                           ;扩展一位数码显示在数码显示器上循环显示0-9这10个数字。
                           ;晶振频率为11.0592MHz
                           ;4C00为50ms定时常数
                             ORG                       0000H
                             LJMP START
                             ORG                       000BH                             ;定时器0中断程序入口地址
                             AJMP INTT0
                             ORG                       0040H
START:
                             MOV                       SP,#60H
                             MOV                       TMOD,#01H                         ;定时器0方式 1
                             MOV                       TL0,#00H                          ;延时 50mS 的常数
                             MOV                       TH0,#4CH
                             MOV                       R0,#0
                             MOV                       R1,#20
                             MOV                       SCON,#00H                         ;置串口工作方式 0
                             CLR                       TI
                             CLR                       RI
                             SETB TR0                               ;开中断
                             SETB ET0
                             SETB EA
                             SJMP $
INTT0:                                        ;定时器0中断子程序
                             PUSH ACC                               ;保护现场
                             PUSH PSW
                             CLR                       ET0                                ;关定时器0中断
                             CLR                       TR0

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本文关键字：单片机  程序  51单片机，单片机-工控设备 - 51单片机