PIC18FXXK80 Datasheet, PDF(20/52 Page) Microchip Technology – Flash Microcontroller Programming Specification

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PIC18FXXK80 Datasheet, PDF (20/52 Pages) Microchip Technology – Flash Microcontroller Programming Specification

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PIC18FXXK80 FAMILY

TABLE 3-9: SINGLE ROW ERASE CODE MEMORY CODE SEQUENCE

4-Bit

Command

Data Payload

Core Instruction

Step 1: Direct access to code memory and enable writes.

0000

8E 7F

9C 7F

84 7F

BSF EECON1, EEPGD

BCF EECON1, CFGS

BSF EECON1, WREN

Step 2: Point to first row in code memory.

0000

6A F8

6A F7

6A F6

CLRF TBLPTRU

CLRF TBLPTRH

CLRF TBLPTRL

Step 3: Enable erase and erase single row.

0000

88 7F

82 7F

00 00

BSF EECON1, FREE

BSF EECON1, WR

NOP â hold PGC high for time P9 and low for time P10.

Step 4: Repeat Step 3 with Address Pointer incremented by 64 until all rows are erased.

FIGURE 3-3:

SINGLE ROW ERASE CODE MEMORY FLOW

Start

Addr = 0

Configure

Device for

Row Erases

Addr = Addr + 64

Start Erase Sequence

and Hold PGC High

for Time P9

Hold PGC Low

for Time P10

All

rows

done?

Yes

Done

DS39972B-page 20

ï£ 2011 Microchip Technology Inc.

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