Datasheet

© 2009 Microchip Technology Inc. DS39632E-page 121
PIC18F2455/2550/4455/4550
TABLE 10-6: SUMMARY OF REGISTERS ASSOCIATED WITH PORTC
RC7/RX/DT/
SDO
RC7 0 OUT DIG LATC<7> data output.
1 IN ST PORTC<7> data input.
RX 1 IN ST Asynchronous serial receive data input (EUSART module).
DT 1 OUT DIG Synchronous serial data output (EUSART module); takes priority over
SPI and port data.
1 IN ST Synchronous serial data input (EUSART module). User must
configure as an input.
SDO 0 OUT DIG SPI data output (MSSP module); takes priority over port data.
TABLE 10-5: PORTC I/O SUMMARY (CONTINUED)
Pin Function
TRIS
Setting
I/O I/O Type Description
Legend: OUT = Output, IN = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input,
TTL = TTL Buffer Input, XCVR = USB transceiver, x = Don’t care (TRIS bit does not affect port direction or is overridden
for this option)
Note 1: Default pin assignment. Alternate pin assignment is RB3 (when CCP2MX = 0).
2: RC4 and RC5 do not have corresponding TRISC bits. In Port mode, these pins are input only. USB data direction is
determined by the USB configuration.
3: 40/44-pin devices only.
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reset
Values
on page
PORTC RC7 RC6 RC5
(1)
RC4
(1)
— RC2 RC1 RC0 56
LATC LATC7 LATC6 — — — LATC2 LATC1 LATC0 56
TRISC TRISC7 TRISC6 — — — TRISC2 TRISC1 TRISC0 56
UCON
— PPBRST SE0 PKTDIS USBEN RESUME SUSPND —57
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by PORTC.
Note 1: RC5 and RC4 are only available as port pins when the USB module is disabled (UCON<3> = 0).