PIC16LF1454 Datasheet, PDF (139/418 Pages) Microchip Technology – 14/20-Pin Flash, 8-Bit USB Microcontrollers with XLP Technology

12.7 PORTC Registers
12.7.1 DATA REGISTER
PORTC is a 8-bit wide, bidirectional port. The
corresponding data direction register is TRISC
(Register 12-13). 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 12-2 shows how to
initialize an I/O port.
Reading the PORTC register (Register 12-12) 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).
12.7.2 DIRECTION CONTROL
The TRISC register (Register 12-13) 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 input
always read ‘0’.
12.7.3 ANALOG CONTROL
The ANSELC register (Register 12-15) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELC bit high will cause all
digital reads on the pin to be read as ‘0’ and allow
analog functions on the pin to operate correctly.
The state of the ANSELC bits has no effect on digital out-
put functions. A pin with TRIS clear and ANSELC set will
still operate as a digital output, but the Input mode will be
analog. This can cause unexpected behavior when exe-
cuting read-modify-write instructions on the affected
port.
Note:
The ANSELC bits default to the Analog
mode after Reset. To use any pins as
digital general purpose or peripheral
inputs, the corresponding ANSEL bits
must be initialized to ‘0’ by user software.
PIC16(L)F1454/5/9
12.7.4 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 12-8.
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 output priority list. 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 output priority list.
TABLE 12-8: PORTC OUTPUT PRIORITY
Pin Name
Function Priority⁽¹⁾
RC0
ICSPDAT
SCL⁽⁴⁾
SCK⁽⁴⁾
RC1
ICSPCLK
SDA⁽⁴⁾
SDI⁽⁴⁾
RC1
RC2
DACOUT1
SDO⁽²⁾
RC2
RC3
DACOUT2
CLKR⁽³⁾
PWM2⁽²⁾
RC3
RC4
CWG1B
C1OUT
C2OUT
TX⁽⁴⁾
RC4
RC5
RC6
RC7
CWG1A
PWM1
RX⁽⁴⁾
RC5
PWM2⁽⁵⁾
RC6
SDO⁽⁵⁾
RC7
Note 1: Priority listed from highest to lowest.
2: Default pin (see APFCON register).
3: Alternate pin (see APFCON register).
4: PIC16(L)F1454/5 only.
5: PIC16(L)F1455/9 only.
 2012 Microchip Technology Inc.
Preliminary
DS41639A-page 139