org 00h mov p2,#0FFh 屏蔽数码管位端口 main: mov p3,#0ffh 复位按键端口 mov a,p3 读键值 swap a 半字节交换 mov p1,a 输出读入的键值 jmp main -org 00h mov p2,#0FFh 屏蔽数码管位端口 main: mov p3,#0ffh 复位按键端口 mov a,p3 读键值 swap a 半字节交换

基于单片的继电器的控制，也就是怎样用单片机来控制继电器-Monolithic relay-based control, that is, how to use microcontroller to control the relay

proteus单片机仿真 数码管、风铃器、继电器综合系统 #include<reg51.h> unsigned char code Tab[] {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90} unsigned char Dat[] {0,0,0,0} sbit JDQ P1^0 sbit Buzzer P3^0 void sound() -Proteus single-chip