PIC18F23K22 datasheet(21/42 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

Advance Information

DS41398B-page 21

PIC18(L)F2XK22/4XK22

TABLE 3-7:

PROGRAMMING DATA MEMORY

4-bit

Command

Data Payload

Core Instruction

Step 1: Direct access to data EEPROM.

0000

9E A6

9C A6

BCF EECON1, EEPGD

BCF EECON1, CFGS

Step 2: Set the data EEPROM Address Pointer.

0000

0E <Addr>

6E A9

OE <AddrH>

6E AA

MOVLW <Addr>

MOVWF EEADR

MOVLW <AddrH>

MOVWF EEADRH

Step 3: Load the data to be written.

0000

0E <Data>

6E A8

MOVLW <Data>

MOVWF EEDATA

Step 4: Enable memory writes.

0000

84 A6

BSF EECON1, WREN

Step 5: Initiate write.

0000

82 A6

00 00

BSF EECON1, WR

NOP

NOP ;write starts on 4th clock of this instruction

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

0000

0010

50 A6

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 A6

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.

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