HELP FOR DIRECTIVES

HOW CAN I USE ADIRECTIVES LIKE WHILE , IF ,AS AN INSTRUCTION
HELPFUL IN APROGRAMLIKEAN EXAMPLE:
WHILE PORTA,1==0
GOTO LOOP5
ENDW
LOOP5
BCF PORTB,3

HAMZAZAYYAD said:

HOW CAN I USE ADIRECTIVES LIKE WHILE , IF ,AS AN INSTRUCTION
HELPFUL IN APROGRAMLIKEAN EXAMPLE:
WHILE PORTA,1==0
GOTO LOOP5
ENDW
LOOP5
BCF PORTB,3

Click to expand...

Use BTFSS or BTFSC - have a look on the PICList for examples of various control structures using them!.

I beleive Microchip assembler has some instructions, branch if bit set and branch if bit clear - I don't remember their mnemonics off the top of my head

other brand microcontrollers should have similar instructions

To use high level directives like while/wend you need a higher level language. Have a look at the free to use **broken link removed** or **broken link removed**. This may help you.

Personally, I'd try to learn assembler. Have a look at .

Mike.

how can i use two sub prog

hi
i need help


linker

CODEPAGE NAME=vectors START=0x0 END=0x1F PROTECTED

CODEPAGE NAME=page START=0x20 END=0x3FF








when i uses a sub program only, no errors
but when i uses more than one sub program ,this error apear


Copyright (c) 2005 Microchip Technology Inc.
Error - section 'INT_VECTOR' can not fit the absolute section. Section 'INT_VECTOR' start=0x00000000, length=0x0000005a
Errors : 1
BUILD FAILED: Mon Jun 06 14:59:42 2005



whats wrong??


my program USES PIC16F84A WITH ASSEMBLY ,MPLAB


SUB PROGRAM
/
//
/
//
RETURN

SUB PROGRAM1
//
/
//
RETURN

SUB PROGRAM2
/
//
/
//
RETURN




MAIN CODE
start


/
/
/
/
call SUB PROGRAM1
/
/
/
/

call SUB PROGRAM2


/
/
/

en

It looks like you are trying to assemble code that is written for a PIC18 chip. I think you should read the sticky and look at Nigel's tutorials.

Mike.