//-------------------------------------------------------------
// 82G516 E/V BOARD ( DT-516 )
//-------------------------------------------------------------
// XTAL : 22.1184Hz
//-------------------------------------------------------------
// filename: DT516-024.c
// 8비트 타이머 인터럽트를 사용한 9999 카운터
//-------------------------------------------------------------
#include <REG_MPC82G516.H>
//
#define  U_C      unsigned char
#define  U_I      unsigned int
#define  U_L      unsigned long
//
#define  I_C      idata char
#define  I_I      idata int
#define  I_L      idata long
#define  I_F      idata float
#define  IU_C     idata unsigned char
#define  IU_I     idata unsigned int
#define  IU_L     idata unsigned long
//
#define  X_C      xdata char
#define  X_I      xdata int
#define  X_L      xdata long
#define  X_F      xdata float
#define  XU_C     xdata unsigned char
#define  XU_I     xdata unsigned int
#define  XU_L     xdata unsigned long
//
#define  C_C      code char
#define  C_I      code int
#define  C_L      code long
#define  C_F      code float
#define  CU_C     code unsigned char
#define  CU_I     code unsigned int
#define  CU_L     code unsigned long
//
#define  FND_COM1  P40
#define  FND_COM2  P41
#define  FND_COM3  P42
#define  FND_COM4  P43
#define  FND_SEG   P0
//
CU_C Seg_Data[]={
    0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E //0123456789AbcdEF
};
//
bit delay_flg=0;
U_C FND_CNT=0;
U_I delay_buf=0, counter=0;
//
// 22118400/12/256=7200Hz=0.13889ms
void Timer_0_Interrupt(void) interrupt 1{  // 7200Hz주기
    P4=0xFF; // FND OFF
    switch(FND_CNT){
        case 0: P0=Seg_Data[counter/1000];     FND_COM1=0; break;
        case 1: P0=Seg_Data[(counter/100)%10]; FND_COM2=0; break;
        case 2: P0=Seg_Data[(counter/ 10)%10]; FND_COM3=0; break;
        case 3: P0=Seg_Data[counter%10];       FND_COM4=0; break;
    }
    if(++FND_CNT>3)FND_CNT=0;
    //
    if(delay_buf){ if(--delay_buf==0)delay_flg=1; }
}
//
void delay_ms(U_I d){ 
    delay_buf=(U_I)((float)d*7.2);
    if(delay_buf==0)delay_buf=1;
    TH0=0; delay_flg=0; while(!delay_flg);
}
//
void main(){
    TMOD=2; ET0=1; TR0=1; EA=1;
    while(1){
        for(counter=0;counter<10000;counter++)delay_ms(1000);
    }
}
//-------------------------------------------------------------