PIC16F1459-ESSQTP datasheet(122/418 Pages) MICROCHIP

Part #	PIC16F1459-ESSQTP

Description	14/20-Pin Flash, 8-Bit USB Microcontrollers with XLP Technology

PDF	418 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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122 / 418 page

PIC16(L)F1454/5/9

DS41639A-page 122

Preliminary

 2012 Microchip Technology Inc.

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

PIC16F1459-ESSQTP Datasheet(PDF) 122 Page - Microchip Technology

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