Information

dsPIC33F/PIC24H PROGRAMMING SPECIFICATION

TABLE 4-1: PROGRAMMING EXECUTIVE COMMAND SET

4.2.4 COMMAND DESCRIPTIONS

All commands supported by the programming executive

are described in Section 4.2.5 “SCHECK Command”

through Section 4.2.13 “QVER Command”.

4.2.5 SCHECK COMMAND

The SCHECK command instructs the programming

executive to do nothing but generate a response. This

command is used as a “Sanity Check” to verify that the

programming executive is operational.

Expected Response (2 words):

0x1000

0x0002

Opcode Mnemonic

Length

(16-bit words)

Time Out Description

0x0

SCHECK 1 1 ms Sanity check.

0x1 READC 3 1 ms Read an 8-bit word from the specified Configuration register

or Device ID register.

0x2 READP 4 1 ms/row Read ‘N’ 24-bit instruction words of code memory starting

from the specified address.

0x3 Reserved N/A N/A This command is reserved. It will return a NACK.

0x4 PROGC 4 5 ms Write an 8-bit word to the specified Configuration register.

0x5 PROGP 99 5 ms Program one row of code memory at the specified address,

then verify.

0x6 Reserved N/A N/A This command is reserved. It will return a NACK.

0x7 Reserved N/A N/A This command is reserved. It will return a NACK.

0x8 Reserved N/A N/A This command is reserved. It will return a NACK.

0x9 ERASEP 3 20 ms Command to erase a page.

0xA Reserved N/A N/A This command is reserved. It will return a NACK.

0xB QVER 1 1 ms Query the programming executive software version.

0xC CRCP 5 1s Performs a CRC-16 on the specified range of memory.

0xD Reserved N/A N/A This command is reserved. It will return a NACK.

0xE QBLANK 5 700 ms Query to check whether the code memory is blank.

Note: One row of code memory consists of (64) 24-bit words. Refer to Table 2-2 for device-specific information.

15 12 11 0

Opcode Length

Field Description

Opcode 0x0

Length 0x1

Note: This instruction is not required for

programming, but is provided for

development purposes only.