avr key lcd

#include <IOM128V.H>    
#include <MACROS.H>    
#include "lcd.h"    
#include "eeplist.h"    
//控制端口定义    
#define KEY_PORT     PORTF    
#define KEY_DDR      DDRF    
#define KEY_PIN      PINF    
#define KEY_INT_PORT     PORTE    
#define KEY_INT_DDR      DDRE    
#define KEY_INT_PIN      PINE    
//端口配置定义    
#define KEY_DDR_Num       0x0F  //端口输入输出方向配置    
#define KEY_PIN_Num       0xF0  //端口输入掩码    
#define KEY_INT_Bit       0x7f  //端口    
//逻辑定义    
#define TRUE              1    
#define FALSE             0    
//定义表    
const unsigned char KEY[17] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16};   
//定义变量    
unsigned char IDcntMemory = 0; //用于记录ID按下的数字已经有几位了    
unsigned char MAcntMemory = 0; //用于记录密码按下的数字已经有几位了    
unsigned char key_jz; //按键的健值    
unsigned char key_press_flag = FALSE; //是否有按键按下    
unsigned char Index = 1;  //菜单索引    
unsigned char IndexNum;  //菜单条目索引个数    
unsigned char FormIndex = 0; //表明显现在是第几个窗口在现显示    
   

unsigned char IDBuf[5];  //0~3存放ID 4存放ID长度    
unsigned char CodeBuf[5];//0~3存放ID 4存放长度    
extern unsigned char ASCIIDisplayBuf[16]; //存放显示时需要的数据    
extern unsigned char TimeBuf[8];          //存放系统时间    
//初始化按键需要的配置    
void Mcu_init_Key(void)   
{   
    KEY_PORT = KEY_PIN_Num;   
    KEY_DDR = KEY_DDR_Num;   
    EIMSK |= 0x80;   
}   
   
//被中断处理函数调用，返回按键值    
unsigned char Mcu_Get_Key(void)   
{   
    unsigned char temp = 0;//暂时存储按键值    
    unsigned char cnt;   
    EIMSK &= (~0x80);//关闭中断，防止再次进入中断，恢复其IO功能    
    KEY_INT_DDR &= KEY_INT_Bit;//置位输入方向    
    for(cnt = 4;cnt < 8;cnt++)   
    {   
        if(cnt == 4)   
              KEY_PORT = 0xFE;   
        else if(cnt == 5)   
              KEY_PORT = 0xFD;   
        else if(cnt == 6)   
             KEY_PORT = 0xFB;   
        else   
            KEY_PORT = 0xF7;   
        if((KEY_PIN&KEY_PIN_Num) == 0xE0)