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PIC24FJ64GA Datasheet(PDF) 37 Page - Microchip Technology |
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PIC24FJ64GA Datasheet(HTML) 37 Page - Microchip Technology |
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37 / 52 page  © 2008 Microchip Technology Inc. DS39768D-page 37 PIC24FJXXXGA0XX 5.2.6 READC COMMAND The READC command instructs the programming executive to read N 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 Device ID registers, the upper byte in every data word returned by the programming executive is 00h and the lower byte contains the Device ID register value. Expected Response (4 + 3 * (N – 1)/2 words for N odd): 1100h 2 + N Device ID Register 1 ... Device ID Register N 5.2.7 READP COMMAND The READP command instructs the programming executive to read N 24-bit words of code memory, including Configuration Words, 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 response to this command uses the packed data format described in Section 5.2.2 “Packed Data Format”. Expected Response (2 + 3 * N/2 words for N even): 1200h 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): 1200h 4 + 3 * (N – 1)/2 Least significant program memory word 1 ... MSB of program memory word N (zero padded) 15 12 11 8 7 0 Opcode Length NAddr_MSB Addr_LS Field Description Opcode 1h Length 3h N Number of 8-bit 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. 15 12 11 8 7 0 Opcode Length N Reserved Addr_MSB Addr_LS Field Description Opcode 2h Length 4h N Number of 24-bit instructions to read (max. of 32768) Reserved 0h 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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