Microchip Technology DM160214 Data Sheet
2010-2012 Microchip Technology Inc.
DS41414D-page 139
PIC16(L)F1946/47
12.9
PORTD Registers
). Setting a TRISD bit (= 1) will make the
corresponding PORTB pin an input (i.e., put the
corresponding output driver in a High-Impedance mode).
Clearing a TRISD bit (= 0) will make the corresponding
PORTD pin an output (i.e., enable the output driver and
put the contents of the output latch on the selected pin).
corresponding output driver in a High-Impedance mode).
Clearing a TRISD bit (= 0) will make the corresponding
PORTD pin an output (i.e., enable the output driver and
put the contents of the output latch on the selected pin).
shows how to initialize an I/O port.
Reading the PORTD register (
) 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 (LATD).
The TRISD register (
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 (LATD).
The TRISD register (
) controls the PORTD
pin output drivers, even when they are being used as
analog inputs. The user should ensure the bits in the
TRISD register are maintained set when using them as
analog inputs. I/O pins configured as analog inputs
always read ‘0’.
analog inputs. The user should ensure the bits in the
TRISD register are maintained set when using them as
analog inputs. I/O pins configured as analog inputs
always read ‘0’.
12.9.1
PORTD FUNCTIONS AND OUTPUT
PRIORITIES
PRIORITIES
Each PORTD pin is multiplexed with other functions. The
pins, their combined functions and their output priorities
are shown in
pins, their combined functions and their output priorities
are shown in
.
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.
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 12-9:
PORTD OUTPUT PRIORITY
Pin Name
Function Priority
(1)
RD0
SEG0 (LCD)
P2D
P2D
(2)
(CCP)
RD0
RD1
SEG1 (LCD)
P2C
P2C
(2)
(CCP)
RD1
RD2
P2B
(2)
(CCP)
SEG2 (LCD)
RD2
RD2
RD3
SEG3 (LCD)
P3C
P3C
(2)
(CCP)
RD3
RD4
SEG4 (LCD)
P3D
P3D
(2)
(CCP)
SDO2 (SSP2)
RD4
RD4
RD5
SEG5 (LCD)
P1C
P1C
(2)
(CCP)
SDA2 (SSP2)
RD5
RD5
RD6
SEG5 (LCD)
P1B
P1B
(2)
(CCP)
SCK2/SCL2 (SSP2)
RD6
RD6
RD7
SEG7 (LCD)
RD7
RD7
Note 1: Priority listed from highest to lowest.
2:
Alternate pin (see APFCON register).