DSPIC30F1010-30I/SP【PDF 49/66 页】IC DSPIC MCU/DSP 6K 28DIP

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2010 Microchip Technology Inc.

DS70102K-page 53

dsPIC30F Flash Programming Specification

11.13 Reading the Application ID Word

The application ID word is stored at address 0x8005BE

in executive code memory. To read this memory

location, you must use the SIX control code to move

this program memory location to the VISI register. The

REGOUT control code must then be used to clock the

contents of the VISI register out of the device. The

corresponding control and instruction codes that must

be serially transmitted to the device to perform this

operation are shown in Table 11-13.

Once the programmer has clocked-out the application

ID word, it must be inspected. If the application ID has

the value 0xBB, the programming executive is resident

in memory and the device can be programmed using

the mechanism described in Section 5.0 “Device

Programming”. However, if the application ID has any

other value, the programming executive is not resident

in memory. It must be loaded to memory before the

device can be programmed. The procedure for loading

the programming executive to the memory is described

in Section 12.0 “Programming the Programming

Executive to Memory”.

11.14 Exiting ICSP Mode

After confirming that the programming executive is

resident in memory, or loading the programming

executive, ICSP mode is exited by removing power to

the device or bringing MCLR to VIL. Programming can

then take place by following the procedure outlined in

Section 5.0 “Device Programming”.

TABLE 11-13: SERIAL INSTRUCTION EXECUTION FOR READING THE APPLICATION ID WORD

Command

(Binary)

Data

(Hexadecimal)

Description

Step 1: Exit the Reset vector.

0000

040100

000000

GOTO 0x100

NOP

Step 2: Initialize TBLPAG and the read pointer (W0) for TBLRD instruction.

0000

200800

880190

205BE0

207841

000000

BA0890

000000

MOV

#0x80, W0

MOV

W0, TBLPAG

MOV

#0x5BE, W0

MOV

VISI, W1

NOP

TBLRDL [W0], [W1]

NOP

Step 3: Output the VISI register using the REGOUT command.

0001

0000

<VISI>

000000

Clock out contents of the VISI register

NOP

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