DatasheetQ Logo
Electronic component search and free download site. Transistors,MosFET ,Diode,Integrated circuits

PIC16F1503 View Datasheet(PDF) - Microchip Technology

Part Name
Description
Manufacturer
PIC16F1503
Microchip
Microchip Technology Microchip
PIC16F1503 Datasheet PDF : 352 Pages
First Prev 11 12 13 14 15 16 17 18 19 20 Next Last
PIC16(L)F1503
FIGURE 3-1:
PROGRAM MEMORY MAP
AND STACK FOR
PIC16(L)F1503
PC<14:0>
CALL, CALLW
RETURN, RETLW
15
Interrupt, RETFIE
Stack Level 0
Stack Level 1
Rev. 10-000040C
7/30/2013
Stack Level 15
Reset Vector
0000h
On-chip
Program
Memory
Interrupt Vector
Page 0
Rollover to Page 0
0004h
0005h
07FFh
0800h
3.2.1
READING PROGRAM MEMORY AS
DATA
There are two methods of accessing constants in
program memory. The first method is to use tables of
RETLW instructions. The second method is to set an
FSR to point to the program memory.
3.2.1.1 RETLW Instruction
The RETLW instruction can be used to provide access
to tables of constants. The recommended way to create
such a table is shown in Example 3-1.
EXAMPLE 3-1:
constants
BRW
RETLW DATA0
RETLW DATA1
RETLW DATA2
RETLW DATA3
RETLW INSTRUCTION
;Add Index in W to
;program counter to
;select data
;Index0 data
;Index1 data
my_function
;… LOTS OF CODE…
MOVLW
DATA_INDEX
call constants
;… THE CONSTANT IS IN W
The BRW instruction makes this type of table very
simple to implement. If your code must remain portable
with previous generations of microcontrollers, then the
BRW instruction is not available so the older table read
method must be used.
Rollover to Page 0 7FFFh
DS40001607D-page 14
2011-2015 Microchip Technology Inc.

Share Link: 

datasheetq.com  [ Privacy Policy ]Request Datasheet ] [ Contact Us ]