求帮设计单片机程序,最好能有原理和功能简述答:51单片机,在四位数码管上显示0-15的:矩阵键盘 include <reg51.h> unsigned char const nums[10]={0xfc,0x60,0xda,0xf2,0x66,0xb6,0xbe,0xe0,0xfe,0xf6};unsigned char const positions[4]={1,2,4,8};sbit HC595_SER=P0^7;sbit HC595_RST=P0^6;sbit HC595_RCK=P0^5;sbit ...