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PIC24FJ64GA 数据表(PDF) 21 Page - Microchip Technology |
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PIC24FJ64GA 数据表(HTML) 21 Page - Microchip Technology |
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21 / 52 page  © 2008 Microchip Technology Inc. DS39768D-page 21 PIC24FJXXXGA0XX 3.7 Writing Configuration Words The PIC24FJXXXGA0XX family configuration is stored in Flash Configuration Words at the end of the user space program memory and in multiple register Configuration Words located in the test space. These registers reflect values read at any Reset from program memory locations. The values can be changed only by programming the content of the corresponding Flash Configuration Word and resetting the device. The Reset forces an automatic reload of the Flash stored configuration values by sequencing through the dedicated Flash Configuration Words and transferring the data into the Configuration registers. To change the values of the Flash Configuration Word once it has been programmed, the device must be Chip Erased, as described in Section 3.5 “Erasing Program Memory”, and reprogrammed to the desired value. It is not possible to program a ‘0’ to ‘1’, but they may be programmed from a ‘1’ to ‘0’ to enable code protection. Table 3-7 shows the ICSP programming details for pro- gramming the Configuration Word locations, including the serial pattern with the ICSP command code which must be transmitted, Least Significant bit first, using the PGCx and PGDx pins (see Figure 3-2). In Step 1, the Reset vector is exited. In Step 2, the NVMCON register is initialized for programming of code memory. In Step 3, the 24-bit starting destination address for programming is loaded into the TBLPAG register and W7 register. The TBLPAG register must be loaded with the following: • 96 and 64 Kbyte devices – 00h • 128 Kbyte devices – 01h To verify the data by reading the Configuration Words after performing the write in order, the code protection bits initially should be programmed to a ‘1’ to ensure that the verification can be performed properly. After verification is finished, the code protection bit can be programmed to a ‘0’ by using a word write to the appropriate Configuration Word. TABLE 3-6: DEFAULT CONFIGURATION REGISTER VALUES Address Name Default Value Last Word CW1 7FFFh(1) Last Word – 2 CW2 FFFFh Note 1: CW1<15> is reserved and must be programmed to ‘0’. |
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