PIC24FXXKA2XX

DS39991A-page 14

 2010 Microchip Technology Inc.

TABLE 3-7:

SERIAL INSTRUCTION EXECUTION FOR WRITING CONFIGURATION REGISTERS

Command

(Binary)

Data

(Hex)

Command

(Binary)

Step 1: Exit the Reset vector.

0000

0000

0000

000000

040200

000000

NOP

GOTO

0x200

NOP

Step 2: Initialize the Write Pointer (W7) for the TBLWT instruction.

0000

200007

MOV

#0x0000, W7

Step 3: Set the NVMCON register to program Configuration registers.

0000

0000

24004A

883B0A

MOV

#0x4004, W10

MOV

W10, NVMCON

Step 4: Initialize the TBLPAG register.

0000

0000

200F80

880190

MOV

#0xF8, W6

MOV

W0, TBLPAG

Step 5: Load the Configuration register data to W6.

0000

2xxxx6

MOV

#<FBS_VALUE>, W6

Step 6: Write the Configuration register data to the write latch and increment the Write Pointer.

0000

0000

0000

0000

000000

BB1B86

000000

000000

NOP

TBLWTL

W6, [W7++]

NOP

NOP

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 5 through 9 to write other fuses, Load W6 with their respective values and W7 with their

respective addresses.