ERROR Example

ERROR Example

Directives highlighted in this example are:

• error

Program Functional Description

This program demonstrates the utility of the error assembler directive, which sets an error message to be printed in the listing file and error file.

Commented Code Listing

list p=16f877 ;Select the device.

#include <p16f877.inc> ;Include standard header file

;for the selected device.

variable baudrate ;variable used to define

;required baud rate

baudrate set D'5600' ;Enter the required value of

;baud rate here.

if (baudrate!=D'1200')&&(baudrate!=D'2400')&&

(baudrate!=D'4800')&&(baudrate!=D'9600')&&

(baudrate!=D'19200')

error "Selected baud rate is not supported"

endif

RST CODE H'0' ;The code section named RST

;is placed at H'0'. The

;instruction 'goto start' is

;placed in code section RST

goto start ;Jumps to the location labelled

;'start'.

INTRT CODE H'4' ;The code section named INTRT is

;placed at H'4'.The instruction

;'goto service_int' is placed in

;code section INTRT.

goto service_int ;Jumps to the location labelled

;'service_int'.

PGM CODE ;This is the begining of the

;code section named PGM. It is a

;relocatable code section since

;no absolute address is given

;along with directive 'CODE'.

start

goto $

service_int

retfie

end