list p=12LF1552    ; Define the target microcontroller
#include <xc.inc>   ; Include the device-specific header file

CONFIG FOSC=INTOSC, WDTE=OFF, PWRTE=OFF, MCLRE=OFF, CP=OFF, BOREN=OFF, CLKOUTEN=OFF

; Define constants
LED_PIN   equ 0      ; RA0 is used to control the LED

; Define memory locations
count1    equ 0x20    ; Memory location for the delay count (LSB)
count2    equ 0x21    ; Memory location for the delay count (MSB)

; Program starts at address 0x0000
org 0x0000

; Main program starts here
main:
    ; Set up the I/O pins
    banksel TRISA	  ; Select the TRISA register bank
    bcf     TRISA,LED_PIN ; Set the LED pin as an output
    banksel PORTA	  ; Select the PORTA register bank
loop:			  ; Loop forever
    bsf     PORTA,LED_PIN ; Turn on the LED
    call    delay         ; Wait for a while
    bcf     PORTA,LED_PIN ; Turn off the LED
    call    delay         ; Wait for a while
    goto    loop          ; Repeat indefinitely

; Delay subroutine
delay:
    movlw   25		  ; Load the delay value in seconds
    movwf   count1        ; Store the delay value (MSB)
delay1:    
    movlw   254           ; Load the delay value (LSB)
    movwf   count2        ; Store the delay value (LSB)
delay_loop2:
    decfsz  count2,f      ; Decrement the MSB register and skip if zero
    goto    delay_loop2   ; Repeat the delay loop if the MSB register is not zero
delay_loop1:
    decfsz  count1,f      ; Decrement the LSB register and skip if zero
    goto    delay1	  ; Repeat the delay loop if the LSB register is not zero
    return                ; Return from the subroutine

end ; End of program