// PIC12F629 Configuration Bit Settings
// 'C' source line config statements
// CONFIG
#pragma config FOSC = INTRCIO   // Oscillator Selection bits (INTOSC oscillator: I/O function on GP4/OSC2/CLKOUT pin, I/O function on GP5/OSC1/CLKIN)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = ON       // Power-Up Timer Enable bit (PWRT enabled)
#pragma config MCLRE = OFF      // GP3/MCLR pin function select (GP3/MCLR pin function is digital I/O, MCLR internally tied to VDD)
#pragma config BOREN = ON       // Brown-out Detect Enable bit (BOD enabled)
#pragma config CP = ON         // Code Protection bit (Program Memory code protection is disabled)
#pragma config CPD = OFF        // Data Code Protection bit (Data memory code protection is disabled)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#include <xc.h>
#include <proc/pic12f629.h>
#define _XTAL_FREQ 4000000
#define LED GP5
#define DummyPulse GP4

uint8_t mystatus=0;
void isrTMR0(void){//TMR0割込処理本体
    if(mystatus){//DummyPulse 1-->0
        TMR0=0xF0;//TMR0を2mSにセット
        DummyPulse=0;
        mystatus=0;
    } else {//DummyPulse 0-->1
        TMR0=0x61;//TMR0を20.3mSにセット
        DummyPulse=1;
        mystatus=1;
    }
   T0IF=0;//TMR0割込フラグクリア
}

//割込処理
void __interrupt() myisr(void){
    //割込判別
    if(T0IF){//TMR0割込
       isrTMR0(); 
    }
}

void main(void){
    OSCCAL=0x30;
    //EEPROMへ署名
    __EEPROM_DATA('NTakahashi NIT-Hakodate 2023/8/15  TMR0 Interrupt', 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF );    
    //初期化   
    TRISIO=0b001100;//GP5,4,1:output GP3,2:input
    nGPPU=0; WPU=2; //GP2=pull up
    
    //パルス幅20.3mS, 周期22.3mS
    //T0CS=0(clock source=FOSC/4), PSA=0(), ,プリスケーラPS<2:0>=110    
    T0CS=0; PSA=0; PS2=1; PS1=1; PS0=0;    //OPTION_REGを設定
    TMR0=0;//TMR0クリア
    T0IE=1;//TMR0割込許可
    INTE=0;//INT割込禁止
    GPIE=0;//GP変更割込禁止
    PEIE=0;//TMR1他割込禁止
    GIE=0;//割込禁止    
//本体
    DummyPulse=0;
    uint8_t i=5;
    while(i--){//最初にLEDが5回点滅
        LED=1; __delay_ms(500);
        LED=0; __delay_ms(500);
    }
    GIE=1;//割込許可
    while(1);
}