Microchip Technology AC244045 Data Sheet
PIC16(L)F1825/1829
DS41440C-page 22
2010-2012 Microchip Technology Inc.
FIGURE 3-1:
PROGRAM MEMORY MAP
AND STACK FOR
PIC16(L)F1825/1829
AND STACK FOR
PIC16(L)F1825/1829
3.1.1
READING PROGRAM MEMORY AS
DATA
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.
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.
3.1.1.1
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
to tables of constants. The recommended way to create
such a table is shown in
EXAMPLE 3-1:
RETLW INSTRUCTION
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.
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.
PC<14:0>
15
0000h
0004h
Stack Level 0
Stack Level 15
Reset Vector
Interrupt Vector
Stack Level 1
0005h
On-chip
Program
Memory
Page 0
07FFh
Rollover to Page 0
0800h
0FFFh
1000h
1000h
7FFFh
Page 1
Rollover to Page 3
Page 2
Page 3
17FFh
1800h
1800h
1FFFh
2000h
2000h
CALL, CALLW
RETURN, RETLW
Interrupt, RETFIE
constants
BRW
;Add Index in W to
;program counter to
;select data
;program counter to
;select data
RETLW DATA0
;Index0 data
RETLW DATA1
;Index1 data
RETLW DATA2
RETLW DATA3
RETLW DATA3
my_function
;… LOTS OF CODE…
MOVLW
MOVLW
DATA_INDEX
call constants
;… THE CONSTANT IS IN W
;… THE CONSTANT IS IN W