DSPIC33F datasheet(50/80 Pages) MICROCHIP

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dsPIC33F/PIC24H PROGRAMMING SPECIFICATION

DS70152D-page 50

Preliminary

4.2.6

READC

COMMAND

The READC command instructs the programming exec-

utive to read N Configuration registers or Device ID

registers, starting from the 24-bit address specified by

Addr_MSB and Addr_LS. This command can only be

used to read 8-bit or 16-bit data.

When this command is used to read Configuration

registers, the upper byte in every data word returned by

the programming executive is 0x00 and the lower byte

contains the Configuration register value.

Expected Response (4 + 3 * (N – 1)/2 words

for N odd):

0x1100

2 + N

Configuration register or Device ID Register 1

...

Configuration register or Device ID Register N

4.2.7

READP

COMMAND

The READP command instructs the programming exec-

utive to read N 24-bit words of code memory, starting

from the 24-bit address specified by Addr_MSB and

Addr_LS. This command can only be used to read 24-

bit data. All data returned in the response to this com-

mand uses the packed data format described in

Section 4.2.2 “Packed Data Format”.

Expected Response (2 + 3 * N/2 words for N even):

0x1200

2 + 3 * N/2

Least significant program memory word 1

...

Least significant data word N

Expected Response (4 + 3 * (N – 1)/2 words

for N odd):

0x1200

4 + 3 * (N – 1)/2

Least significant program memory word 1

...

MSB of program memory word N (zero padded)

12 11

8 7

Opcode

Length

NAddr_MSB

Addr_LS

Field

Description

Opcode

0x1

Length

0x3

Number of 8-bit Configuration registers

or Device ID registers to read (max of

256)

Addr_MSB

MSB of 24-bit source address

Addr_LS

Least Significant 16 bits of 24-bit

source address

Note:

Reading

unimplemented

memory

will

cause the programming executive to

reset. Please ensure that only memory

locations present on a particular device

are accessed.

12 11

8 7

Opcode

Length

Reserved

Addr_MSB

Addr_LS

Field

Description

Opcode

0x2

Length

0x4

Number of 24-bit instructions to read

(max of 32768)

Reserved

0x0

Addr_MSB

MSB of 24-bit source address

Addr_LS

Least Significant 16 bits of 24-bit

source address

Note:

Reading

unimplemented

memory

will

cause the programming executive to

reset. Please ensure that only memory

locations present on a particular device

are accessed.

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