Microchip Technology MCU PIC PIC18F87K22-I/PTRSL TQFP-80 MCP PIC18F87K22-I/PTRSL Data Sheet
Product codes
PIC18F87K22-I/PTRSL
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
)
BW
(
)
ABW1
ABW0
(
)
EASHFT
(
)
—
—
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
= 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
= 16-Bit Data Width modes
0
= 8-Bit Data Width modes
bit 5-4
ABW<1:0>:
External Memory Bus Configuration bits
(
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
= 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’.