 2010 Microchip Technology Inc.

DS39991A-page 11

PIC24FXXKA2XX

Step 4: Load W0:W5 with the next 4 instruction words to program.

0000

0000

0000

0000

0000

0000

2xxxx0

2xxxx1

2xxxx2

2xxxx3

2xxxx4

2xxxx5

MOV

#<LSW0>, W0

MOV

#<MSB1:MSB0>, W1

MOV

#<LSW1>, W2

MOV

#<LSW2>, W3

MOV

#<MSB3:MSB2>, W4

MOV

#<LSW3>, W5

Step 5: Set the Read Pointer (W6) and load the (next set of) write latches.

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

EB0300

000000

BB0BB6

000000

000000

BBDBB6

000000

000000

BBEBB6

000000

000000

BB1BB6

000000

000000

BB0BB6

000000

000000

BBDBB6

000000

000000

BBEBB6

000000

000000

BB1BB6

000000

000000

CLR

W6

NOP

TBLWTL

[W6++], [W7]

NOP

NOP

TBLWTH.B

[W6++], [W7++]

NOP

NOP

TBLWTH.B

[W6++], [++W7]

NOP

NOP

TBLWTL

[W6++], [W7++]

NOP

NOP

TBLWTL

[W6++], [W7]

NOP

NOP

TBLWTH.B

[W6++], [W7++]

NOP

NOP

TBLWTH.B

[W6++], [++W7]

NOP

NOP

TBLWTL

[W6++], [W7++]

NOP

NOP

Step 6: Repeat Steps 3 though 5, eight times, to load the write latches for 32 instructions.

Step 7: Initiate the write cycle.

0000

0000

0000

A8E761

000000

000000

BSET

NVMCON, #WR

NOP

NOP

Step 8: Repeat this step to poll the WR bit (bit 15 of NVMCON) until it is cleared by the hardware.

0000

0000

0000

0000

0000

0001

0000

040200

000000

803B02

883C22

000000

<VISI>

000000

GOTO

0x200

NOP

MOV

NVMCON, W2

MOV

W2, VISI

NOP

Clock out contents of the VISI register.

NOP

Step 9: Reset device internal PC.

0000

0000

040200

000000

GOTO

0x200

NOP

Step 10: Repeat Steps 3 through 9 until the entire code memory is programmed.

TABLE 3-5:

SERIAL INSTRUCTION EXECUTION FOR WRITING CODE MEMORY (CONTINUED)

Command

(Binary)

Data

(Hex)

Description