DSPIC33F datasheet(68/80 Pages) MICROCHIP

68 / 80 page

dsPIC33F/PIC24H PROGRAMMING SPECIFICATION

DS70152D-page 68

Preliminary

6.0

PROGRAMMING THE

PROGRAMMING EXECUTIVE

TO MEMORY

6.1

Overview

If it is determined that the programming executive is not

present in executive memory (as

described

Section 3.2 “Confirming the Presence of the Pro-

gramming Executive”), it must be programmed into

executive memory using ICSP, as described in

Section 5.0 “Device Programming – ICSP”.

Storing the programming executive to executive

memory is similar to normal programming of code

memory. Namely, the executive memory must first be

erased, and then the programming executive must be

programmed 64 words at a time. This control flow is

summarized in Table 6-1.

TABLE 6-1:

PROGRAMMING THE PROGRAMMING EXECUTIVE

Command

(Binary)

Data

(Hex)

Description

Step 1: Exit Reset vector and erase executive memory.

0000

000000

040200

000000

NOP

GOTO

0x200

NOP

Step 2: Initialize the NVMCON to erase a page of executive memory.

0000

24072A

883B0A

MOV

#0x4042, W10

MOV

W10, NVMCON

Step 3: Initiate the erase cycle, wait for erase to complete and make sure WR bit is clear.

0000

0001

A8E761

000000

807600

887840

000000

<VISI>

BSET

NVMCON, #15

NOP

Externally time ‘P12’ msec

(see Section TABLE 8-1: “AC/DC

Characteristics and Timing Requirements”

) to allow suffi-

cient time for the Page Erase operation to complete.

MOV

NVMCON, W0

MOV

W0, VISI

NOP

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

is clear.

Step 4: Repeat Step 3 four times to erase all four pages of executive memory.

Step 5: Initialize the NVMCON to program 64 instruction words.

0000

24001A

883B0A

MOV

#0x4001, W10

MOV

W10, NVMCON

Step 6: Initialize TBLPAG and the write pointer (W7).

0000

200800

880190

EB0380

000000

MOV

#0x80, W0

MOV

W0, TBLPAG

CLR

NOP

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