i'm new to microcontroller, i'm using MPLAB to implement a program that enables me to flash a LED using push button, and after four presses, another led is eternally switched on. this is the code with the output:

THE CODE:

#include <p16F84a.inc>

__CONFIG   _CP_OFF & _WDT_OFF & _PWRTE_ON & _HS_OSC

CBLOCK 0x0c
	counter

ENDC
	movlw 0x04
	movwf counter

org	0x00
bsf STATUS, RP0
movlw 0x01
movwf TRISB
movlw 0x00
movwf TRISA
bcf STATUS, RP0

Start
bcf PORTA, 0

push 
btfsc PORTB,0
goto count

goto push

count 
decfsz counter, f
goto push

goto second_led

second_led
bsf PORTA, 0

end

the OUTPUT:

Clean: Deleting intermediary and output files.
Clean: Done.
Executing: "C:\Program Files\Microchip\MPASM Suite\MPASMWIN.exe" /q /p16F84A "led flash.asm" /l"led flash.lst" /e"led flash.err" /d__DEBUG=1
Warning[205] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 3 : Found directive in column 1. (__CONFIG)
Warning[205] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 5 : Found directive in column 1. (CBLOCK)
Warning[205] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 8 : Found directive in column 1. (ENDC)
Warning[205] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 12 : Found directive in column 1. (org)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 13 : Found opcode in column 1. (bsf)
Error[118] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 13 : Overwriting previous address contents (0000)
Error[118] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 13 : Overwriting previous address contents (0000)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 14 : Found opcode in column 1. (movlw)
Error[118] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 14 : Overwriting previous address contents (0001)
Error[118] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 14 : Overwriting previous address contents (0001)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 15 : Found opcode in column 1. (movwf)
Message[302] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 15 : Register in operand not in bank 0. Ensure that bank bits are correct.
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 16 : Found opcode in column 1. (movlw)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 17 : Found opcode in column 1. (movwf)
Message[302] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 17 : Register in operand not in bank 0. Ensure that bank bits are correct.
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 18 : Found opcode in column 1. (bcf)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 21 : Found opcode in column 1. (bcf)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 24 : Found opcode in column 1. (btfsc)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 25 : Found opcode in column 1. (goto)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 27 : Found opcode in column 1. (goto)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 30 : Found opcode in column 1. (decfsz)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 31 : Found opcode in column 1. (goto)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 33 : Found opcode in column 1. (goto)
Warning[203] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 36 : Found opcode in column 1. (bsf)
Warning[205] C:\USERS\GIG\DESKTOP\LAB\LED FLASH\LED FLASH.ASM 38 : Found directive in column 1. (end)
Halting build on first failure as requested.
----------------------------------------------------------------------
Debug build of project `C:\Users\GIG\Desktop\lab\led flash\led flash.mcp' failed.
Language tool versions: MPASMWIN.exe v5.50, mplink.exe v4.48, mplib.exe v4.48
Preprocessor symbol `__DEBUG' is defined.
Sun Jun 01 12:08:31 2014
----------------------------------------------------------------------
BUILD FAILED

 

hi 89,
Try this, it now assembles. Ensure that you keep it formatted as posted.
E

    list      p=16F84A    
    #include <p16F84a.inc> 
   
    errorlevel -302, -207
    
    __config _CP_OFF & _WDT_OFF & _PWRTE_ON & _HS_OSC

    cblock    0x0c
    counter
    endc
        
    org    0x00
    bsf    STATUS, RP0
    movlw    0x01
    movwf    TRISB
    movlw    0x00
    movwf    TRISA
    bcf    STATUS, RP0

Start
    movlw    0x04
    movwf    counter
    bcf    PORTA, 0

push         
    btfsc    PORTB,0
    goto    count

    goto    push

count         
    decfsz    counter, f
    goto    push

    goto    second_led

second_led 
    bsf    PORTA, 0
    end

 

Eric, many many thanks