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PIC24FJ64GA Datasheet(PDF) 47 Page - Microchip Technology |
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PIC24FJ64GA Datasheet(HTML) 47 Page - Microchip Technology |
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47 / 52 page  © 2008 Microchip Technology Inc. DS39768D-page 47 PIC24FJXXXGA0XX 6.2 Checksum Computation Checksums for the PIC24FJXXXGA0XX family are 16 bits in size. The checksum is calculated by summing the following: • Contents of code memory locations • Contents of 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 code memory is summed by adding all three bytes of code memory. TABLE 6-4: CHECKSUM COMPUTATION Device Read Code Protection Checksum Computation Erased Checksum Value Checksum with 0xAAAAAA at 0x0 and Last Code Address PIC24FJ16GA002 Disabled CFGB + SUM(0:02BFB) 0xBB5A 0xB95C Enabled 0 0x0000 0x0000 PIC24FJ16GA004 Disabled CFGB + SUM(0:02BFB) 0xBB5A 0xB95C Enabled 0 0x0000 0x0000 PIC24FJ32GA002 Disabled CFGB + SUM(0:057FB) 0x795A 0x775C Enabled 0 0x0000 0x0000 PIC24FJ32GA004 Disabled CFGB + SUM(0:057FB) 0x795A 0x775C Enabled 0 0x0000 0x0000 PIC24FJ48GA002 Disabled CFGB + SUM(0:083FB) 0x375A 0x355C Enabled 0 0x0000 0x0000 PIC24FJ48GA004 Disabled CFGB + SUM(0:083FB) 0x375A 0x355C Enabled 0 0x0000 0x0000 PIC24FJ64GA002 Disabled CFGB + SUM(0:0ABFB) 0xFB5A 0xF95C Enabled 0 0x0000 0x0000 PIC24FJ64GA004 Disabled CFGB + SUM(0:0ABFB) 0xFB5A 0xF95C Enabled 0 0x0000 0x0000 PIC24FJ64GA006 Disabled CFGB + SUM(0:0ABFB) 0xFACC 0xF8CE Enabled 0 0x0000 0x0000 PIC24FJ64GA008 Disabled CFGB + SUM(0:0ABFB) 0xFACC 0xF8CE Enabled 0 0x0000 0x0000 PIC24FJ64GA010 Disabled CFGB + SUM(0:0ABFB) 0xFACC 0xF8CE Enabled 0 0x0000 0x0000 PIC24FJ96GA006 Disabled CFGB + SUM(0:0FFFB) 0x7CCC 0x7ACE Enabled 0 0x0000 0x0000 PIC24FJ96GA008 Disabled CFGB + SUM(0:0FFFB) 0x7CCC 0x7ACE Enabled 0 0x0000 0x0000 PIC24FJ96GA010 Disabled CFGB + SUM(0:0FFFB) 0x7CCC 0x7ACE 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), 64/80/100-Pin Devices = Byte sum of (CW1 & 0x7DDF + CW2 & 0x87E3) 28/44-Pin Devices = Byte sum of (CW1 & 0x7FDF + CW2 & 0xFFF7) Note: CW1 address is last location of implemented program memory; CW2 is (last location – 2). |
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