PIC16F15213 datasheet(116/439 Pages) MICROCHIP

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Note:

See the NVM Unlock Sequence section.

Example 15-4. Writing to Program Flash Memory

INTCONbits.GIE = 0;

// Disable interrupts

// PFM row must be erased before writes can occur

NVMCON1bits.NVMREGS = 0;

// Point to PFM

NVMADR = PFMStartAddress;

// Must start at beginning of PFM row

NVMCON1bits.FREE = 1;

// Specify an erase operation

NVMCON1bits.WREN = 1;

// Allow erase cycle

// Required unlock sequence

NVMCON2 = 0x55;

NVMCON2 = 0xAA;

NVMCON1bits.WR = 1;

NVMCON1bits.LWLO = 1;

// Load write latches

// Write to the data latches

for (i = 0; i < PFM_ROW_SIZE; i++)

{

NVMADR = PFMStartAddress;

// Load starting address

NVMDAT = PFM_WRITE_DATA;

// Load data

// Required unlock sequence

NVMCON2 = 0x55;

NVMCON2 = 0xAA;

NVMCON1bits.WR = 1;

PFMStartAddress++;

// Increment address

if(i = (PFM_ROW_SIZE - 1))

// All latches loaded?

{

NVMCON1bits.LWLO = 0;

// Start PFM write

}

NVMCON1bits.WREN = 0;

// Disable writes

INTCONbits.GIE = 1;

// Enable interrupts

15.1.2.5 Modifying Flash Program Memory

When modifying existing data in a program memory, data within the memory row must 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.

PIC16F15213/14/23/24/43/44

NVM - Nonvolatile Memory Control

and its subsidiaries

Data Sheet

DS40002195E-page 116

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