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PIC24F04KA201 bảng dữ liệu(PDF) 44 Page - Microchip Technology |
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PIC24F04KA201 bảng dữ liệu(HTML) 44 Page - Microchip Technology |
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44 / 48 page  PIC24FXXKAXXX DS39919A-page 44 Advance Information © 2008 Microchip Technology Inc. 6.0 DEVICE ID The Device ID region of memory can be used to determine the mask, variant and manufacturing information about the device. The Device ID region is 2 x 16 bits and it can be read using the READC command. This region of memory is read-only and can also be read when code protection is enabled. Table 6-1 provides the Device ID for each device; Table 6-2 provides the Device ID registers; Table 6-3 describes the bit field of each register. TABLE 6-1: DEVICE IDs 6.1 Checksums 6.1.1 CHECKSUM COMPUTATION Checksums for the PIC24FXXKAXXX family are 16 bits. The checksum is calculated by summing the following: • Contents of the code memory locations • Contents of the Configuration registers Table 6-4 describes how to calculate the checksum for each device. All memory locations are summed, one byte at a time, using only their native data size. More specifically, Configuration registers are summed by adding the lower two bytes of these locations (the upper byte is ignored) while the code memory is summed by adding all three bytes of the code memory. TABLE 6-2: PIC24FXXKAXXX DEVICE ID REGISTERS Device ID DEVID PIC24F08KA101 0D08h PIC24F16KA101 0D01h PIC24F08KA102 0D0Ah PIC24F16KA102 0D03h PIC24F04KA200 0D02h PIC24F04KA201 0D00h Address Name Bit 15 14 13 12 11 10 9876 543210 FF0000h DEVID FAMID<7:0> DEV<7:0> FF0002h DEVREV — REV<3:0> TABLE 6-3: DEVICE ID BITS DESCRIPTION Bit Field Register Description FAMID<7:0> DEVID Encodes the family ID of the device. DEV<7:0> DEVID Encodes the individual ID of the device. REV<3:0> DEVREV Encodes the revision number of the device. TABLE 6-4: CHECKSUM COMPUTATION Device Read Code Protection Checksum Computation Erased Checksum Value Chip Checksum with 0xAAAAAA at 0x00 Location and at Last Location PIC24F16KAXXX Disabled CFGB + SUM (0:002BFE) 0xC334 0xC136 Enabled 0 0x0000 0x0000 PIC24F08KAXXX Disabled CFGB + SUM (0:0015FE) 0xE434 0xE236 Enabled 0 0x0000 0x0000 PIC24F04KAXXX Disabled CFGB + SUM (0:000AFE) 0x74B4 0x72B6 Enabled 0 0x0000 0x0000 Legend: Item Description SUM[a:b] = Byte sum of locations, a to b inclusive (all 3 bytes of code memory) CFGB = Configuration Block (masked), Byte sum of (FBS & 0x000F + FGS & 0x0003 + FOSCSEL & 0x0087 + FOSC & 0x00DF + FWDT & 0x00DF + FPOR & 0x00FB + FICD & 0x00C3 + FDS & 0x00FF) |
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