
2009 Microchip Technology Inc.
DS39887C-page 31
PIC18F2458/2553/4458/4553
3.0
SPECIAL FEATURES OF THE
CPU
PIC18F2458/2553/4458/4553 devices include several
features intended to maximize reliability and minimize
cost through elimination of external components.
These include:
Device ID Registers
3.1
Device ID Registers
The Device ID registers are “read-only” registers.
They identify the device type and revision to device
programmers, and can be read by firmware using
table reads.
TABLE 3-1:
DEVICE IDs
Note:
For additional details on the Con-
figuration
bits,
refer
to
the
“PIC18F2455/2550/4455/4550 Data Sheet”,
Section 25.1 “Configuration Bits”. Device
ID information presented in this section is for
PIC18F2458/2553/4458/4553 only.
File Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Default/
Unprogrammed
Value
3FFFFEh DEVID1
DEV2
DEV1
DEV0
REV4
REV3
REV2
REV1
REV0
xxxx xxxx(1)
3FFFFFh DEVID2
DEV10
DEV9
DEV8
DEV7
DEV6
DEV5
DEV4
DEV3
xxxx xxxx(1)
Legend:
x = unknown, u = unchanged
Note 1:
user.