PIC16F1459T-E/SL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F1459T-E/SL

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

Microchip Technology 

PIC16(L)F1454/5/9

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:

1. Load the starting address of the row to be

modified.

2. Read the existing data from the row into a RAM

image.

3. Modify the RAM image to contain the new data

to be written into program memory.

4. Load the starting address of the row to be

rewritten.

5. Erase the program memory row.

6. Load the write latches with data from the RAM

image.

7. Initiate a programming operation.

FIGURE 11-7:

FLASH PROGRAM

MEMORY MODIFY

FLOWCHART

Start

Modify Operation

Read Operation

F(Figiguurere11x-.x2)

An image of the entire row read

must be stored in RAM

Modify Image

The words to be modified are

changed in the RAM image

Erase Operation

F(Figiguurere11x-.x4)

WRITE Operation

use RAM image

F(Figiugruere11x-.x5)

End

Modify Operation

DS41639A-page 122

Preliminary

 2012 Microchip Technology Inc.

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