ORG PIC18CXXX Example

ORG PIC18CXXX Example

Directives highlighted in this example for PIC18CXXX devices are:

• org

Program Functional Description

This example shows the usage of the org directive. Code generation begins at an address spcified by org <address>. The origin of a data table also can be specified by this directive. A data table may be placed either in a program memory region or in an EE data memory region, as in case of PICmicro device with EE data FLASH.

Commented Code Listing

list p=18c452 ;Select the device.

#include <p18c452.inc> ;Include standard header file

;for the selected device.

org 0000 ;The following code will be

;programmed in reset address 0.

goto Main ;Jump to an address whose label is

;'Main'.

org 0008 ;The following code will be

;programmed in high priority

;interrupt address 8.

goto int_hi ;Jump to an address whose label is

;'int_hi'.

org 0018 ;The following code will be

;programmed in low priority

;interrupt address 18h.

goto int_lo ;Jump to an address whose label is

;'int_lo'.

org 0010 ;The following code section will

;be programmed starting from

;address 10H.

Main

; ;Write your main program here.

;

;

goto Main ;Loop back to 'Main'

org 0100 ;The following code section will

;be programmed starting from

;address 100H.

int_hi

;

; ;Write your high priority

; ;interrupt service routine here.

retfie ;Return from interrupt.

org 0200 ;The following code section will

;be programmed starting from

;address 200H.

int_lo

;

; ;Write your low priority

; ;interrupt service routine here.

retfie ;Return from interrupt.

org 1000 ;You can create a data or

;character table starting from any

;address in program memory. In

;this case the address is 1000h.

ch_tbl1 db "PICwithFLASH"

end