51单片机按键的扫描相关资料分享

#include ***it ADDR0 = P1^0;***it ADDR1 = P1^1;***it ADDR2 = P1^2;***it ADDR3 = P1^3;***it ENLED = P1^4;***it KEY1 = P2^4;***it KEY2 = P2^5;***it KEY3 = P2^6;***it KEY4 = P2^7;unsigned char code LedChar[] = { //数码管显示字符转换表0xC0, 0xF9, 0xA4,