PIC18F2458 Datasheet, PDF (31/46 Pages) Microchip Technology – 28/40/44-Pin High-Performance, Enhanced Flash, USB Microcontrollers with 12-Bit A/D and nanoWatt Technology

PIC18F2458/2553/4458/4553
3.0 SPECIAL FEATURES OF THE
CPU
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.
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
File Name
Bit 7 Bit 6 Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Default/
Unprogrammed
Value
3FFFFEh
3FFFFFh
Legend:
Note 1:
DEVID1
DEVID2
DEV2 DEV1
DEV10 DEV9
DEV0
DEV8
REV4
DEV7
REV3
DEV6
REV2
DEV5
REV1
DEV4
REV0
DEV3
xxxx xxxx⁽¹⁾
xxxx xxxx⁽¹⁾
x = unknown, u = unchanged
See Register 3-1 and Register 3-2 for DEVID values. DEVID registers are read-only and cannot be programmed by the
user.
© 2007 Microchip Technology Inc.
Preliminary
DS39887B-page 29