C51 键盘扫描程序下载

[weixin_39820535]

unsigned char kbscan()

{

unsigned char sccode,recode;

P1=0xf0; //发全“0”行扫描，列线输入

if(P1&0xf0)!=0xf0) //有键按下

{

delay10ms(); //延时去抖动

if((P1&0xf0)!=0xf0)

{

sccode =0xf0; //逐行扫描初值

while((sccodeZ&0x10)!=0)

{

P1=sccode; //输出行扫描码

if((P1&0XF0)!=0XF0) //本行有键按下
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