DSPIC33F datasheet(63/80 Pages) MICROCHIP

63 / 80 page

Preliminary

DS70152D-page 63

dsPIC33F/PIC24H PROGRAMMING SPECIFICATION

TABLE 5-8:

SERIAL INSTRUCTION EXECUTION FOR WRITING CONFIGURATION REGISTERS

Command

(Binary)

Data

(Hex)

Description

Step 1: Exit the Reset vector.

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 one Configuration register.

0000

24000A

883B0A

MOV

#0x4000, W10

MOV

W10, NVMCON

Step 4: Initialize the TBLPAG register.

0000

200F80

880190

MOV

#0xF8, W0

MOV

W0, TBLPAG

Step 5: Load the Configuration register data to W6.

0000

2xxxx0

MOV

#<CONFIG_VALUE>, W0

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

0000

BB1B96

000000

TBLWTL W0, [W7++]

NOP

Step 7: Initiate the write cycle.

0000

A8E761

000000

BSET

NVMCON, #WR

NOP

Step 8: Wait for the Configuration Register Write operation to complete and make sure WR bit is clear.

0000

0001

807600

887840

000000

<VISI>

Externally time ‘P20’ msec

(see Section TABLE 8-1: “AC/DC

Characteristics and Timing Requirements”

) to allow suffi-

cient time for the Configuration Register Write operation to

complete.

MOV, NVMCON, W0

MOV

W0, VISI

NOP

Clock out contents of VISI register. Repeat until the WR bit

is clear.

Step 9: Reset device internal PC.

0000

040200

000000

GOTO

0x200

NOP

Step 10: Repeat steps 5-9 until all twelve Configuration registers are written.

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