Datasheet

PIC24FJXXXGA0XX

TABLE 5-1: PROGRAMMING EXECUTIVE COMMAND SET

5.2.4 COMMAND DESCRIPTIONS

All commands supported by the programming executive

are described in Section 5.2.5 “SCHECK Command”

through Section 5.2.12 “QVER Command”.

5.2.5 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):

1000h

0002h

Opcode Mnemonic

Length

(16-bit words)

Time-out Description

0h SCHECK 1 1 ms Sanity check.

1h READC 3 1 ms Read an 8-bit word from the specified Device ID register.

2h READP 4 1 ms/row Read N 24-bit instruction words of code memory starting from

the specified address.

3h RESERVED N/A N/A This command is reserved. It will return a NACK.

4h PROGC 4 5 ms Write an 8-bit word to the specified Device ID registers.

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

then verify.

(1)

7h RESERVED N/A N/A This command is reserved. It will return a NACK.

8h RESERVED N/A N/A This command is reserved. It will return a NACK.

9h RESERVED N/A N/A This command is reserved. It will return a NACK.

Ah QBLANK 3 TBD Query if the code memory is blank.

Bh QVER 1 1 ms Query the programming executive software version.

Dh PROGW 4 5 ms Program one instruction word of code memory at the specified

address, then verify.

Legend: TBD = To Be Determined

Note 1: One row of code memory consists of (64) 24-bit words. Refer to Table 2-3 for device-specific information.

15 12 11 0

Opcode Length

Field Description

Opcode 0h

Length 1h

Note: This instruction is not required for

programming but is provided for

development purposes only.