Datasheet

 2009-2011 Microchip Technology Inc. DS39960D-page 409
PIC18F87K22 FAMILY
REGISTER 28-5: CONFIG3L: CONFIGURATION REGISTER 3 LOW (BYTE ADDRESS 300004h)
U-1 U-1 U-1 U-1 U-1 U-0 U-0 R/P-1
WAIT
(1)
BW
(1)
ABW1
(1)
ABW0
(1)
EASHFT
(1)
— —RTCOSC
bit 7 bit 0
Legend: P = Programmable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7
WAIT: External Bus Wait Enable bit
(1)
1 = Wait states on the external bus are disabled
0 = Wait states on the external bus are enabled and selected by MEMCON <5:4>
bit 6
BW: Data Bus Width Select bit
(1)
1 = 16-Bit Data Width modes
0 = 8-Bit Data Width modes
bit 5-4
ABW<1:0>: External Memory Bus Configuration bits
(1)
11 = 8-Bit Address mode (Microcontroller mode)
10 = 12-Bit Address mode
01 = 16-Bit Address mode
00 = 20-Bit Address mode
bit 3
EASHFT: External Address Bus Shift Enable bit
(1)
1 = Address shifting is enabled; external address is shifted to start at 000000h
0 = Address shifting is disabled; external address bus reflects the PC value
bit 2-1
Unimplemented: Read as ‘0’
bit 0
RTCOSC: RTCC Reference Clock Select bit
1 = RTCC uses SOSC as the reference clock
0 = RTCC uses LF-INTOSC as the reference clock
Note 1: Unimplemented on 64-pin devices (PIC18F6XK22), read as ‘0’.