PIC24FJ64GA004-IPT Datasheet, PDF (40/52 Pages) Microchip Technology – PIC24FJXXXGA0XX Flash Programming Specification

PIC24FJXXXGA0XX
5.2.12 QVER COMMAND
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0
Opcode
Length
Field
Description
Opcode
Bh
Length
1h
The QVER command queries the version of the
programming executive software stored in test
memory. The “version.revision” information is returned
in the response’s QE_Code using a single byte with the
following format: main version in upper nibble and
revision in the lower nibble (i.e., 23h means version 2.3
of programming executive software).
Expected Response (2 words):
1BMNh (where “MN” stands for version M.N)
0002h
5.3 Programming Executive
Responses
The programming executive sends a response to the
programmer for each command that it receives. The
response indicates if the command was processed
correctly. It includes any required response data or
error data.
The programming executive response set is shown in
Table 5-2. This table contains the opcode, mnemonic
and description for each response. The response format
is described in Section 5.3.1 “Response Format”.
TABLE 5-2: PROGRAMMING EXECUTIVE
RESPONSE OP CODES
Opcode Mnemonic
Description
1h
PASS
Command successfully
processed
2h
FAIL
Command unsuccessfully
processed
3h
NACK
Command not known
5.3.1 RESPONSE FORMAT
All programming executive responses have a general
format consisting of a two-word header and any
required data for the command.
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Opcode Last_Cmd
QE_Code
Length
D_1 (if applicable)
...
D_N (if applicable)
Field
Opcode
Last_Cmd
QE_Code
Length
D_1
D_N
Description
Response opcode
Programmer command that
generated the response
Query code or error code.
Response length in 16-bit words
(includes 2 header words)
First 16-bit data word (if applicable)
Last 16-bit data word (if applicable)
5.3.1.1 Opcode Field
The opcode is a 4-bit field in the first word of the
response. The opcode indicates how the command
was processed (see Table 5-2). If the command was
processed successfully, the response opcode is PASS.
If there was an error in processing the command, the
response opcode is FAIL and the QE_Code indicates
the reason for the failure. If the command sent to
the programming executive is not identified, the
programming executive returns a NACK response.
5.3.1.2 Last_Cmd Field
The Last_Cmd is a 4-bit field in the first word of
the response and indicates the command that the
programming executive processed. Since the program-
ming executive can only process one command at a
time, this field is technically not required. However, it
can be used to verify that the programming executive
correctly received the command that the programmer
transmitted.
DS39768D-page 40
© 2008 Microchip Technology Inc.