PIC16F1503T-EST View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F1503T-EST

14-Pin Flash, 8-Bit Microcontrollers

Microchip Technology 

10.3 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.

PIC16(L)F1503

FIGURE 10-7:

FLASH PROGRAM

MEMORY MODIFY

FLOWCHART

Rev. 10-000050A

7/30/2013

Start

Modify Operation

Read Operation

(See Note 1)

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

(See Note 2)

Write Operation

Use RAM image

(See Note 3)

End

Modify Operation

Note 1: See Figure 10-2.

2: See Figure 10-4.

3: See Figure 10-5.

 2011-2015 Microchip Technology Inc.

DS40001607D-page 89

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