DSPIC33F datasheet(36/80 Pages) MICROCHIP

36 / 80 page

dsPIC33F/PIC24H PROGRAMMING SPECIFICATION

DS70152D-page 36

Preliminary

FIGURE 3-4:

FLOWCHART FOR

PROGRAMMING CODE

MEMORY

3.5.2

PROGRAMMING VERIFICATION

After code memory is programmed, the contents of

memory can be verified to ensure that programming

was successful. Verification requires code memory to

be read back and compared against the copy held in

the programmer’s buffer.

The READP command can be used to read back all the

programmed code memory.

Alternatively, you can have the programmer perform

the verification after the entire device is programmed,

using a checksum computation.

3.5.3

CHECKSUM COMPUTATION

Only the Configuration registers are included in the

checksum computation. The Device ID and Unit ID are

not included in the checksum computation.

Table 3-2 shows how this 16-bit computation can be

made for each dsPIC33F and PIC24H device. Compu-

tations for read code protection are shown both

enabled and disabled. The checksum values shown

here assume that the Configuration registers are also

erased. However, when code protection is enabled,

the value of the FGS register is assumed to be 0x5.

PROGP

response

PASS?

RemainingCmds

‘0’?

BaseAddress = 0x0

RemainingCmds = 1368

RemainingCmds =

RemainingCmds – 1

BaseAddress =

BaseAddress + 0x80

Yes

Start

Failure

Report Error

Send PROGP

Command to Program

BaseAddress

Finish

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