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PIC blinked - init

osc, timer0, led
  • Osciliator
  • timer0
  • led

Osciliator

    banksel OSCCON1
    movlw   0x63        ; System oscillator set to 4MHz
    movwf   OSCCON1

Start timer0

    banksel T0CON1
    movlw   0x48        ; Set TIMER0 clock source to FOSC/4, scale 1:256 TIMER0 overflows every 32.768 milliseconds
    movwf   T0CON1
    banksel T0CON0
    movlw   0x80        ; Start TIMER0
    movwf   T0CON0

Seup TIMER0

;
; Seup TIMER0
;
    banksel TMR0L
    clrf    TMR0L
    movlw   0xFF
    movwf   TMR0H
    banksel PIR0
    bcf     PIR0,PIR0_TMR0IF_POSITION
    bsf     PIE0,PIE0_TMR0IE_POSITION
    movlw   TIMER0_TICKS_TO_LED_TOGGLE
    movwf   LED_D2_wait
  • Constant
#define TIMER0_TICKS_TO_LED_TOGGLE 10
  • Variable
    PSECT   Isr_Data,global,class=COMMON,space=1,delta=1,noexec
LED_D2_wait:DS      1

led

    banksel TRISA
    bcf     TRISA,TRISA_TRISA4_POSITION
    bcf     TRISA,TRISA_TRISA5_POSITION
    banksel LATA
    bcf     LATA,LATA_LATA4_POSITION
    bcf     LATA,LATA_LATA5_POSITION

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