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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PIC24F16KA102 데이터시트(PDF) 25 Page - Microchip Technology |
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PIC24F16KA102 데이터시트(HTML) 25 Page - Microchip Technology |
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25 / 48 page  PIC24FXXKAXXX © 2008 Microchip Technology Inc. Advance Information DS39919A-page 25 FIGURE 4-3: ENTERING ENHANCED ICSP™ MODE USING LOW-VOLTAGE ENTRY FIGURE 4-4: ENTERING ENHANCED ICSP™ MODE USING HIGH-VOLTAGE ENTRY 4.4 Blank Check The term “Blank Check” implies verifying if the device has been successfully erased and has no programmed memory locations. A blank or erased memory location is always read as ‘1’. The Device ID registers (FF0002h:FF0000h) can be ignored by the Blank Check as this region stores device information that cannot be erased. The device Configuration registers are also ignored by the Blank Check. Additionally, all unimplemented memory space should be ignored by the Blank Check. The QBLANK command is used for the Blank Check. It determines if the code memory is erased by testing these memory regions. A ‘BLANK’ or ‘NOT BLANK’ response is returned. If it is determined that the device is not blank, it must be erased before attempting to program the device. 4.5 Code Memory Programming 4.5.1 PROGRAMMING METHODOLOGY Code memory is programmed with the PROGP command. PROGP programs one row of code memory, starting from the memory address specified in the command. The number of PROGP commands required to program a device depends on the number of write blocks that must be programmed in the device. Figure 4-5 illustrates an example flowchart for programming code memory. In this example, all 5.5K instruction words of a PIC24FXXKAXXX device are programmed. • First, the number of commands to send (titled ‘RemainingCmds’ in the flowchart) is set to 176, and the destination address (called ‘BaseAddress’) is set to ‘0’. • Next, one write block in the device is programmed with a PROGP command. Each PROGP command contains data for one row of code memory of the PIC24FXXKAXXX device. • After the first command is processed successfully, ‘RemainingCmds’ is decremented by 1 and compared with 0. Since there are more PROGP commands to be sent, ‘BaseAddress’ is incremented by 40h to point to the next row of memory. On the second PROGP command, the second row is programmed. This process is repeated until the entire device is programmed. Special handling should not be performed when a panel boundary is crossed. MCLR PGDx PGCx VDD P6 P14 b31 b30 b29 b28 b27 b2 b1 b0 b3 ... Program/Verify Entry Code = 4D434850h P1A P1B P18 P19 0 1 001 0 0 0 0 P7 VIH VIH VPP PGDx PGCx VDD P6 b31 b30 b29 b28 b27 b2 b1 b0 b3 ... Program/Verify Entry Code = 4D434850h P1A P1B P18 0 1 001 000 0 VIHH P7 |
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