PIC16F15213 datasheet(34/439 Pages) MICROCHIP

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Figure 9-2. Program Memory and Stack (PIC16F152x4)

Filename:

Figure 4-2 Memory Map and Stack (4k).vsdx

Title:

Last Edit:

1/23/2020

First Used:

Notes:

Rev. Figure 4-2

1/23/2020

PC[14:0]

Stack Level 0

Stack Level 1

Stack Level 15

Reset Vector

Interrupt Vector

On-chip

Program

Memory

Unimplemented

0000h

0004h

0005h

0FFFh

1000h

7FFFh

CALL, CALLW

RETURN, RETLW

Interrupt, RETFIE

9.1.1

Reading Program Memory as Data

There are three methods of accessing constants in program memory. The first method is to use tables of RETLW

instructions, the second, to set an FSR to point to the program memory, and the third is to use the NVMREG interface

to access the program memory.

9.1.1.1

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 the following example.

Example 9-1. Accessing Table of Constants Using the RETLW Instruction

constants

BRW

;Add Index in W to

;program counter to

;select data

RETLW DATA0

;Index0 data

PIC16F15213/14/23/24/43/44

Memory Organization

and its subsidiaries

Data Sheet

DS40002195E-page 34

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