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dsPIC30F Flash Programming Specification

DS70102K-page 54

2010 Microchip Technology Inc.

12.0 PROGRAMMING THE

PROGRAMMING EXECUTIVE

TO MEMORY

12.1

Overview

If it is determined that the programming executive does

not reside in executive memory (as described in

Section 4.0 “Confirming the Contents of Executive

Memory”), it must be programmed into executive

memory using ICSP and the techniques described in

Section 11.0 “ICSP Mode”.

Storing the programming executive to executive

memory is similar to normal programming of code

memory. The executive memory must first be erased,

and then the programming executive must be

programmed 32 words at a time. This control flow is

summarized in Table 12-1.

TABLE 12-1:

PROGRAMMING THE PROGRAMMING EXECUTIVE

Command

(Binary)

Data

(Hexadecimal)

Description

Step 1: Exit the Reset vector and erase executive memory.

0000

040100

000000

GOTO 0x100

NOP

Step 2: Initialize the NVMCON to erase executive memory.

0000

24072A

883B0A

MOV

#0x4072, W10

MOV

W10, NVMCON

Step 3: Unlock the NVMCON for programming.

0000

200558

883B38

200AA9

883B39

MOV

#0x55, W8

MOV

W8, NVMKEY

MOV

#0xAA, W9

MOV

W9, NVMKEY

Step 4: Initiate the erase cycle.

0000

—

0000

A8E761

000000

—

000000

A9E761

000000

BSET NVMCON, #15

NOP

Externally time ‘P13a’ ms (see Section 13.0 “AC/DC Characteristics and

Timing Requirements”)

NOP

BCLR NVMCON, #15

NOP

Step 5: Initialize the TBLPAG and the write pointer (W7).

0000

200800

880190

EB0380

000000

MOV

#0x80, W0

MOV

W0, TBLPAG

CLR

NOP

Step 6: Initialize the NVMCON to program 32 instruction words.

0000

24001A

883B0A

MOV

#0x4001, W10

MOV

W10, NVMCON

Step 7: Load W0:W5 with the next 4 words of packed programming executive code and initialize W6 for

programming. Programming starts from the base of executive memory (0x800000) using W6 as a read

pointer and W7 as a write pointer.

0000

2<LSW0>0

2<MSB1:MSB0>1

2<LSW1>2

2<LSW2>3

2<MSB3:MSB2>4

2<LSW3>5

MOV

#<LSW0>, W0

MOV

#<MSB1:MSB0>, W1

MOV

#<LSW1>, W2

MOV

#<LSW2>, W3

MOV

#<MSB3:MSB2>, W4

MOV

#<LSW3>, W5

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