PIC12F1516 MICROCHIP [Microchip Technology], PIC12F1516 Datasheet - Page 125

• Manufacturer Part Number: PIC12F1516
• Description: 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

12.5
PORTD is a 8-bit wide, bidirectional port. The
corresponding
(Register
corresponding PORTD 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).
Example 12-1
Reading the PORTD register
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
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 input
always read ‘0’.
12.5.1
The ANSELD register
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELD 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 ANSELD bits has no affect on digital out-
put functions. A pin with TRIS clear and ANSELD 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.
 2010 Microchip Technology Inc.
Note:
PORTD Registers
(PIC16F1517/1519 only)
12-16). Setting a TRISD bit (= 1) will make the
ANSELD REGISTER
The ANSELD register must be initialized
to configure an analog channel as a digital
input. Pins configured as analog inputs
will read ‘0’.
shows how to initialize an I/O port.
data
direction
(Register
(Register
(Register
12-16) controls the
register
12-18) is used to
12-15) reads the
is
TRISD
Preliminary
12.5.2
PORTD has no peripheral outputs, so the PORTD
output has no priority function.
PIC16(L)F1516/7/8/9
PORTD FUNCTIONS AND OUTPUT
PRIORITIES
DS41452B-page 125