PIC16F1946 Datasheet, PDF (131/440 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

12.4 PORTC Registers
PORTC is a 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 12-3 shows how to initialize PORTC.
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 input
always read ‘0’.
EXAMPLE 12-3: INITIALIZING PORTC
BANKSEL
CLRF
BANKSEL
CLRF
BANKSEL
MOVLW
MOVWF
PORTC
;
PORTC
;Init PORTC
LATC
;Data Latch
LATC
;
TRISC
;
B'11110000' ;Set RC<7:4> as inputs
TRISC
;and set RC<3:0> as
;outputs
PIC16F/LF1946/47
12.4.1 PORTC FUNCTIONS AND OUTPUT
PRIORITIES
Each PORTC pin is multiplexed with other functions. The
pins, their combined functions and their output priorities
are briefly described here. For additional information,
refer to the appropriate section in this data sheet.
When multiple outputs are enabled, the actual pin
control goes to the peripheral with the lowest number in
the following lists.
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.
RC0
1. T1OSO (Timer1 Oscillator)
2. T1CKI (TMR1)
3. SEG40 (ICD)
RC1
1. T1OSI (Timer1 Oscillator)
2. CCP2/P2A
3. SEG32 (ICD)
RC2
1. SEG13 (LCD)
2. CCP1/P1A
RC3
1. SEG17 (LCD)
2. SCL1 (MSSP1)
3. SCK1 (MSSP1)
RC4
1. SEG16 (LCD)
2. SDA1 (MSSP1)
3. SDI1 (MSSP1)
RC5
1. SEG12 (LCD)
2. SDO1 (MSSP1)
RC6
1. SEG27 (LCD)
2. TX1 (EUSART1)
3. CK2 (EUSART1)
RC7
1. SEG28 (LCD)
2. DT1 (EUSART1)
3. RX1 (EUSART1)
 2010 Microchip Technology Inc.
Preliminary
DS41414A-page 129