timer.h

基于89S52的电子时钟

#ifndef __TIMER_H__
#define __TIMER_H__
extern unsigned char time_1s_ok;
extern unsigned int year;
extern volatile unsigned char week,second,minute,hour,day,month;  //分别保存秒、分、时、天、月、年的变量
extern unsigned char n_50m_second;             //保存多少个50毫秒的变量
extern unsigned char days_of_month;            //保存该月多少天的变量
void timer(void);
void display_time(void);
#endif