Datasheet
© 2009 Microchip Technology Inc. DS39663F-page 285
PIC18F87J10 FAMILY
REGISTER 24-5: CONFIG3L: CONFIGURATION REGISTER 3 LOW (BYTE ADDRESS 300004h)
R/WO-1 R/WO-1 R/WO-1 R/WO-1 R/WO-1 U-0 U-0 U-0
WAIT
(1)
BW
(1)
EMB1
(1)
EMB0
(1)
EASHFT
(1)
— — —
bit 7 bit 0
Legend:
R = Readable bit WO = Write-Once bit U = Unimplemented bit, read as ‘0’
-n = Value when device is unprogrammed ‘1’ = Bit is set ‘0’ = Bit is cleared
bit 7 WAIT: External Bus Wait Enable bit
(1)
1 = Wait states for operations on external memory bus disabled
0 = Wait states for operations on external memory bus enabled
bit 6 BW: Data Bus Width Select bit
(1)
1 = 16-Bit External Bus mode
0 = 8-Bit External Bus mode
bit 5-4 EMB<1:0>: External Memory Bus Configuration bits
(1)
11 = Microcontroller mode – external bus disabled
10 = Extended Microcontroller mode,12-Bit Address mode
01 = Extended Microcontroller mode,16-Bit Address mode
00 = Extended Microcontroller mode, 20-Bit Address mode
bit 3 EASHFT: External Address Bus Shift Enable bit
(1)
1 = Address shifting enabled; address on external bus is offset to start at 000000h
0 = Address shifting disabled; address on external bus reflects the PC value
bit 2-0 Unimplemented: Read as ‘0’
Note 1: Implemented only on 80-pin devices.
REGISTER 24-6: CONFIG3H: CONFIGURATION REGISTER 3 HIGH (BYTE ADDRESS 300005h)
U-0 U-0 U-0 U-0 U-0 U-0 R/WO-1 R/WO-1
— — — — — —ECCPMX
(1)
CCP2MX
bit 7 bit 0
Legend:
R = Readable bit WO = Write-Once bit U = Unimplemented bit, read as ‘0’
-n = Value when device is unprogrammed ‘1’ = Bit is set ‘0’ = Bit is cleared
bit 7-2 Unimplemented: Read as ‘0’
bit 1 ECCPMX: ECCPx MUX bit
(1)
1 = ECCP1 outputs (P1B/P1C) are multiplexed with RE6 and RE5;
ECCP3 outputs (P3B/P3C) are multiplexed with RE4 and RE3
0 = ECCP1 outputs (P1B/P1C) are multiplexed with RH7 and RH6;
ECCP3 outputs (P3B/P3C) are multiplexed with RH5 and RH4
bit 0 CCP2MX: ECCP2 MUX bit
1 = ECCP2/P2A is multiplexed with RC1
0 = ECCP2/P2A is multiplexed with RE7 in Microcontroller mode (all devices) or with RB3 in Extended
Microcontroller mode (80-pin devices only)
Note 1: Available only on 80-pin devices.