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PIC16(L)F1946/47
DS41414D-page 136
2010-2012 Microchip Technology Inc.
12.7
PORTC Registers
PORTC is an 8-bit wide, bidirectional port. The
corresponding data direction register is TRISC
(Register 12-11). Setting a TRISC bit (= 1) will make the
corresponding PORTC pin an input (i.e., put the
corresponding output driver in a High-Impedance mode).
Clearing a TRISC bit (= 0) will make the corresponding
PORTC pin an output (i.e., enable the output driver and
put the contents of the output latch on the selected pin).
Example 12-1 shows how to initialize an I/O port.
Reading the PORTC register (Register 12-10) reads the
status of the pins, whereas writing to it will write to the
PORT latch. All write operations are read-modify-write
operations. Therefore, a write to a port implies that the
port pins are read, this value is modified and then written
to the PORT data latch (LATC).
The TRISC register (Register 12-11) controls the
PORTC pin output drivers, even when they are being
used as analog inputs. The user should ensure the bits in
the TRISC register are maintained set when using them
as analog inputs. I/O pins configured as analog inputs
always read ‘0’.
12.7.1
PORTC FUNCTIONS AND OUTPUT
PRIORITIES
Each PORTC pin is multiplexed with other functions. The
pins, their combined functions and their output priorities
are shown in Table 12-7.
When multiple outputs are enabled, the actual pin
control goes to the peripheral with the highest priority.
Analog input and some digital input functions are not
included in the list below. These input functions can
remain active when the pin is configured as an output.
Certain digital input functions override other port
functions and are included in the priority list.
TABLE 12-7:
PORTC OUTPUT PRIORITY
Pin Name
Function Priority(1)
RC0
T1OSO (Timer1 Oscillator)
SEG40 (ICD)
RC0
RC1
T1OSI (Timer1 Oscillator)
CCP2(2)/P2A(2)
SEG32 (ICD)
RC1
RC2
SEG13 (LCD)
CCP1/P1A
RC2
RC3
SEG17 (LCD)
SCL1 (MSSP1)
SCK1 (MSSP1)
RC3
RC4
SEG16 (LCD)
SDA1 (MSSP1)
RC4
RC5
SEG12 (LCD)
SDO1 (MSSP1)
RC5
RC6
SEG27 (LCD)
TX1 (EUSART1)
CK2 (EUSART1)
RC6
RC7
SEG28 (LCD)
DT1 (EUSART1)
RC7
Note 1: Priority listed from highest to lowest.
2:
Default pin (see APFCON register).
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