PIC16 datasheet(103/418 Pages) MICROCHIP

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DS40001609C-page 103

PIC16(L)F1508/9

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:

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 10-7:

FLASH PROGRAM

MEMORY MODIFY

FLOWCHART

Start

Modify Operation

End

Modify Operation

Read Operation

(See Note 1)

An image of the entire row

read must be stored in RAM

Erase Operation

(See Note 2)

Modify Image

The words to be modified are

changed in the RAM image

Write Operation

Use RAM image

(See Note 3)

Rev. 10-000050A

7/30/2013

Note 1: See Figure 10-2.

2: See Figure 10-4.

3: See Figure 10-5.

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