Datasheet

PIC18(L)F1XK22
DS41365E-page 258  2009-2011 Microchip Technology Inc.
22.1 Configuration Bits
The Configuration bits can be programmed (read as
‘0’) or left unprogrammed (read as ‘1’) to select various
device configurations. These bits are mapped starting
at program memory location 300000h.
The user will note that address 300000h is beyond the
user program memory space. In fact, it belongs to the
configuration memory space (300000h-3FFFFFh), which
can only be accessed using table reads and table writes.
Programming the Configuration registers is done in a
manner similar to programming the Flash memory. The
WR bit in the EECON1 register starts a self-timed write
to the Configuration register. In normal operation mode,
a TBLWT instruction with the TBLPTR pointing to the
Configuration register sets up the address and the data
for the Configuration register write. Setting the WR bit
starts a long write to the Configuration register. The
Configuration registers are written a byte at a time. To
write or erase a configuration cell, a TBLWT instruction
can write a ‘1’ or a ‘0’ into the cell. For additional details
on Flash programming, refer to Section 4.5 “Writing
to Flash Program Memory”.
TABLE 22-1: CONFIGURATION BITS AND DEVICE IDs
File Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Default/
Unprogrammed
Value
300001h CONFIG1H IESO FCMEN PCLKEN PLL_EN FOSC3 FOSC2 FOSC1 FOSC0 0010 0111
300002h CONFIG2L
— — — BORV1 BORV0 BOREN1 BOREN0 PWRTEN ---1 1111
300003h CONFIG2H
— — — WDTPS3 WDTPS2 WDTPS1 WDTPS0 WDTEN ---1 1111
300005h CONFIG3H MCLRE
— — — HFOFST
— — —
1--- 1---
300006h CONFIG4L
BKBUG
ENHCPU — —BBSIZLVP —STVREN-0-- 01-1
300008h CONFIG5L
— — — — — —CP1CP0---- --11
300009h CONFIG5H CPD CPB
— — — — — — 11-- ----
30000Ah CONFIG6L
— — — — — — WRT1 WRT0 ---- --11
30000Bh CONFIG6H WRTD WRTB WRTC
— — — — — 111- ----
30000Ch CONFIG7L
— — — — — — EBTR1 EBTR0 ---- --11
30000Dh CONFIG7H
—EBTRB— — — — — — -1-- ----
3FFFFEh DEVID1
(1)
DEV2 DEV1 DEV0 REV4 REV3 REV2 REV1 REV0 qqqq qqqq
(1)
3FFFFFh DEVID2
(1)
DEV10 DEV9 DEV8 DEV7 DEV6 DEV5 DEV4 DEV3 0000 1100
Legend: x = unknown, u = unchanged, – = unimplemented, q = value depends on condition.
Shaded cells are unimplemented, read as ‘0’
Note 1: See Register 22-12 for DEVID1 values. DEVID registers are read-only and cannot be programmed by the user.