How does an led flash 1,100000 seconds with PIC?

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I’m using the MPLAB IDE to simulate a flashing led for 1,100000 seconds.

But I’m not getting it. It always goes for more or less.

I wish you could give me a hint. Or some formula on how to calculate the Nop and loop I should put.

    LIST   P=PIC16F628A
    RADIX DEC   
    #INCLUDE <P16F628A.INC>
    __CONFIG _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON & _BODEN_OFF & _LVP_OFF & _CP_OFF & _MCLRE_OFF  
    ;ou __CONFIG H'3F10'

    CBLOCK  0x20    ;ENDEREÇO INICIAL DA MEMÓRIA DE
                    ;USUÃRIO
    CONTADOR1
    CONTADOR2
    ENDC            ;FIM DO BLOCO DE MEMÓRIA       

    ORG 0x00        ;ENDEREÇO INICIAL DE PROCESSAMENTO

    INICIO
    CLRF    PORTA       ;LIMPA O PORTA
    CLRF    PORTB       ;LIMPA O PORTB
    BSF STATUS, RP0
    CLRF TRISB
    BCF STATUS, RP0

    REPETE
    BSF PORTB, 1
    BSF PORTB, 1
    CALL ATRASO0
    BCF PORTB, 1
    CALL ATRASO2
    GOTO REPETE


    ATRASO0

    NOP
    NOP
    NOP
    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
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    CALL ATRASO1
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    CALL ATRASO1
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    CALL ATRASO1
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    CALL ATRASO1
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    CALL ATRASO1
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    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
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    CALL ATRASO1
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    CALL ATRASO1
    CALL ATRASO1
    CALL ATRASO1
    ATRASO1     
        NOP
        NOP
        NOP
        NOP
        NOP
        NOP
        NOP
        NOP
        NOP
        NOP

    ;   

    RETURN


    ATRASO2

    NOP
    NOP
    NOP
    NOP
    NOP
    NOP
    NOP
    CALL ATRASO3
    CALL ATRASO3
    CALL ATRASO3
    CALL ATRASO3
    CALL ATRASO3
    CALL ATRASO3
    CALL ATRASO3
    CALL ATRASO3
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    CALL ATRASO3

    ATRASO3     
        NOP
        NOP
        NOP
        NOP
        NOP
        NOP
        NOP
        NOP
        NOP
        NOP

    ;   

    RETURN






    ;
    RETURN              


    END











    END
pic

1 answer

0

I haven’t worked with Assembly in a while PIC. When I worked and needed one delay i resorted to a site that generated the code I needed. To my surprise this site still exists. And it’s this one: Microchip PIC Delay Code Generator.

I put the setting below:

Configuração utilizada no Pic Delay Code Generator

And the generated code was as follows:

; Delay = 1.1 seconds
; Clock frequency = 4 MHz

; Actual delay = 1.1 seconds = 1100000 cycles
; Error = 0 %

    cblock
    d1
    d2
    d3
    endc

Delay_1_dot_1_second
            ;1099992 cycles
    movlw   0xD5
    movwf   d1
    movlw   0x66
    movwf   d2
    movlw   0x03
    movwf   d3
Delay_1_dot_1_second_0
    decfsz  d1, f
    goto    $+2
    decfsz  d2, f
    goto    $+2
    decfsz  d3, f
    goto    Delay_1_dot_1_second_0

            ;4 cycles
    goto    $+1
    goto    $+1

            ;4 cycles (including call)
    return

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