PIC18FXXK80 Datasheet, PDF(27/52 Page) Microchip Technology – Flash Microcontroller Programming Specification

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PIC18FXXK80 Datasheet, PDF (27/52 Pages) Microchip Technology – Flash Microcontroller Programming Specification

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PIC18FXXK80 FAMILY

TABLE 3-13: PROGRAMMING DATA MEMORY

4-Bit

Command

Data Payload

Core Instruction

Step 1: Direct access to data EEPROM.

0000

9E 7F

9C 7F

BCF EECON1, EEPGD

BCF EECON1, CFGS

Step 2: Set the data EEPROM Address Pointer.

0000

0E <Addr>

6E 74

OE <AddrH>

6E 75

MOVLW

MOVWF

MOVLW

MOVWF

<Addr>

EEADR

<AddrH>

EEADRH

Step 3: Load the data to be written.

0000

0E <Data>

6E 73

MOVLW <Data>

MOVWF EEDATA

Step 4: Enable memory writes.

0000

84 7F

BSF EECON1, WREN

Step 5: Initiate write.

0000

82 7F

BSF EECON1, WR

Step 6: Poll WR bit, repeat until the bit is clear.

0000

0010

50 7F

6E F5

00 00

MOVF EECON1, W, 0

MOVWF TABLAT

NOP

Shift out data(1)

Step 7: Hold PGC low for time, P10.

Step 8: Disable writes.

0000

94 7F

BCF EECON1, WREN

Repeat Steps 2 through 8 to write more data.

Note 1: See Figure 4-4 for details on shift out data timing.

ï£ 2011 Microchip Technology Inc.

DS39972B-page 27

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