PIC16F1526 datasheet(111/354 Pages) MICROCHIP

Part #	PIC16F1526

Description	64-Pin Flash Microcontrollers with nanoWatt XLP Technology

PDF	354 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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 2011 Microchip Technology Inc.

Preliminary

DS41458A-page 111

PIC16(L)F1526/27

11.3

Modifying Flash Program Memory

When modifying existing data in a program memory

row, and data within that row must be preserved, it must

first be read and saved in a RAM image. Program

memory is modified using the following steps:

Load the starting address of the row to be

modified.

Read the existing data from the row into a RAM

image.

Modify the RAM image to contain the new data

to be written into program memory.

Load the starting address of the row to be

rewritten.

Erase the program memory row.

Load the write latches with data from the RAM

image.

Initiate a programming operation.

FIGURE 11-7:

FLASH PROGRAM

MEMORY MODIFY

FLOWCHART

Start

Modify Operation

Read Operation

(Figure x.x)

Erase Operation

(Figure x.x)

Modify Image

The words to be modified are

changed in the RAM image

End

Modify Operation

Write Operation

use RAM image

(Figure x.x)

An image of the entire row read

must be stored in RAM

Figure 11-2

Figure 11-4

Figure 11-5

PIC16F1526 Datasheet(PDF) 111 Page - Microchip Technology

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