PIC24F04KA200 Datasheet, PDF (21/26 Pages) Microchip Technology – Flash Programming Specifications

PIC24FXXKA2XX
4.0 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 4-1 provides the Device ID for each device;
Table 4-2 provides the Device ID registers; Table 4-3
describes the bit field of each register.
TABLE 4-1: DEVICE IDs
Device ID
DEVID
PIC24F04KA200
PIC24F04KA201
0D02h
0D00h
4.1 Checksums
4.1.1 CHECKSUM COMPUTATION
Checksums for the PIC24FXXKA2XX family are
16 bits. The checksum is calculated by summing the
following:
• Contents of the code memory locations
• Contents of the Configuration registers
Table 4-4 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 4-2: PIC24FXXKA2XX DEVICE ID REGISTERS
Address
Name
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FF0000h
FF0002h
DEVID
DEVREV
FAMID<7:0>
—
DEV<7:0>
REV<3:0>
TABLE 4-3: DEVICE ID BITS DESCRIPTION
Bit Field
Register
Description
FAMID<7:0>
DEV<7:0>
REV<3:0>
DEVID
DEVID
DEVREV
Encodes the family ID of the device.
Encodes the individual ID of the device.
Encodes the revision number of the device.
TABLE 4-4: CHECKSUM COMPUTATION
Device
Read Code Protection
Checksum Computation
Erased
Checksum
Value
Chip Checksum with
0xAAAAAA at 0x00
Location and
at Last Location
PIC24F04KAXXX
Disabled
Enabled
CFGB + SUM (0:000AFE)
0
0x74B4
0x0000
0x72B6
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 (FGS & 0x0003 + FOSCSEL & 0x0087 + FOSC & 0x00DF + FWDT & 0x00DF +
FPOR & 0x00FB + FICD & 0x00C3 + FDS & 0x00FF)
 2010 Microchip Technology Inc.
DS39991A-page 21