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PIC24FJ64GA Datasheet(PDF) 40 Page - Microchip Technology |
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PIC24FJ64GA Datasheet(HTML) 40 Page - Microchip Technology |
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40 / 52 page  PIC24FJXXXGA0XX DS39768D-page 40 © 2008 Microchip Technology Inc. 5.2.12 QVER COMMAND 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 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. 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. 15 12 11 0 Opcode Length Field Description Opcode Bh Length 1h Opcode Mnemonic Description 1h PASS Command successfully processed 2h FAIL Command unsuccessfully processed 3h NACK Command not known Field Description Opcode Response opcode Last_Cmd Programmer command that generated the response QE_Code Query code or error code. Length Response length in 16-bit words (includes 2 header words) D_1 First 16-bit data word (if applicable) D_N Last 16-bit data word (if applicable) 15 12 11 8 7 0 Opcode Last_Cmd QE_Code Length D_1 (if applicable) ... D_N (if applicable) |
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