//Target:ATMEGA16//Crystal:8.0000Mhz//key.h#ifndef_4X4_H_#define_4X4_H_#defineNo_key255#definekey_po
主程序里：ChangeClockDivider(key,12);//key=14cal_cpu_bus_clk();找到函数：//************************[HCLK,PCLK]
#includereg51.h>#defineucharunsignedchar#defineuintunsignedintsbitK1=P3^7;uchari,second_count,key
