DSPIC30F1010-30I/SP【PDF 44/66 页】IC DSPIC MCU/DSP 6K 28DIP

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2010 Microchip Technology Inc.

DS70102K-page 49

dsPIC30F Flash Programming Specification

11.10 Reading Code Memory

Reading from code memory is performed by executing

a series of TBLRD instructions and clocking out the data

using the REGOUT command. To ensure efficient

execution and facilitate verification on the programmer,

four instruction words are read from the device at a

time.

Table 11-10 shows the ICSP programming details for

reading code memory. In Step 1, the Reset vector is

exited. In Step 2, the 24-bit starting source address for

reading is loaded into the TBLPAG and W6 registers.

The upper byte of the starting source address is stored

to TBLPAG, while the lower 16 bits of the source

address are stored to W6.

To minimize the reading time, the packed instruction

word format that was utilized for writing is also used for

reading (see Figure 11-5). In Step 3, the write pointer

W7 is initialized, and four instruction words are read

from code memory and stored to working registers

W0:W5. In Step 4, the four instruction words are

clocked out of the device from the VISI register using

the REGOUT command. In Step 5, the internal PC is

reset to 0x100, as a precautionary measure, to prevent

the PC from incrementing into unimplemented memory

when large devices are being read. Lastly, in Step 6,

Steps 3-5 are repeated until the desired amount of

code memory is read.

TABLE 11-10: SERIAL INSTRUCTION EXECUTION FOR READING CODE MEMORY

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 (W6) for TBLRD instruction.

0000

200xx0

880190

2xxxx6

MOV

#<SourceAddress23:16>, W0

MOV

W0, TBLPAG

MOV

#<SourceAddress15:0>, W6

Step 3: Initialize the write pointer (W7) and store the next four locations of code memory to W0:W5.

0000

EB0380

000000

BA1B96

000000

BADBB6

000000

BADBD6

000000

BA1BB6

000000

BA1B96

000000

BADBB6

000000

BADBD6

000000

BA0BB6

000000

CLR

NOP

TBLRDL

[W6], [W7++]

NOP

TBLRDH.B

[W6++], [W7++]

NOP

TBLRDH.B

[++W6], [W7++]

NOP

TBLRDL

[W6++], [W7++]

NOP

TBLRDL

[W6], [W7++]

NOP

TBLRDH.B

[W6++], [W7++]

NOP

TBLRDH.B

[++W6], [W7++]

NOP

TBLRDL

[W6++], [W7]

NOP

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