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PIC24FJ64GA 数据表(PDF) 29 Page - Microchip Technology |
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PIC24FJ64GA 数据表(HTML) 29 Page - Microchip Technology |
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29 / 52 page  © 2008 Microchip Technology Inc. DS39768D-page 29 PIC24FJXXXGA0XX 4.4 Blank Check The term “Blank Check” implies verifying that 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 since 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 chip. 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. A flowchart for programming code memory is shown in Figure 4-4. In this example, all 44K instruction words of a PIC24FJ128GA device are programmed. First, the number of commands to send (called ‘RemainingCmds’ in the flowchart) is set to 688 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 PIC24FJXXXGA0XX device. After the first command is processed successfully, ‘RemainingCmds’ is decre- mented by 1 and compared with 0. Since there are more PROGP commands to send, ‘BaseAddress’ is incremented by 80h 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. No special handling must be performed when a panel boundary is crossed. FIGURE 4-4: FLOWCHART FOR PROGRAMMING CODE MEMORY Is PROGP response PASS? Are RemainingCmds ‘0’? BaseAddress = 00h RemainingCmds = 688 RemainingCmds = RemainingCmds – 1 BaseAddress = BaseAddress + 80h No No Yes Yes Start Failure Report Error Send PROGP Command to Program BaseAddress Finish |
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