Datasheet

 2010 Microchip Technology Inc. DS39622L-page 21
PIC18F2XXX/4XXX FAMILY
TABLE 3-7: PROGRAMMING DATA MEMORY
4-Bit
Command
Data Payload Core Instruction
Step 1: Direct access to data EEPROM.
0000
0000
9E A6
9C A6
BCF EECON1, EEPGD
BCF EECON1, CFGS
Step 2: Set the data EEPROM Address Pointer.
0000
0000
0000
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
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 BSF EECON1, WR
Step 6: Poll WR bit, repeat until the bit is clear.
0000
0000
0000
0010
50 A6
6E F5
00 00
<MSB><LSB>
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.