PIC12F1516 MICROCHIP [Microchip Technology], PIC12F1516 Datasheet - Page 128

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

PIC16(L)F1516/7/8/9
12.6
PORTE is a 4-bit wide, bidirectional port. The
corresponding data direction register is TRISE. Setting a
TRISE bit (= 1) will make the corresponding PORTE pin
an input (i.e., put the corresponding output driver in a
High-Impedance mode). Clearing a TRISE bit (= 0) will
make the corresponding PORTE pin an output (i.e.,
enable the output driver and put the contents of the
output latch on the selected pin). The exception is RE3,
which is input only and its TRIS bit will always read as
‘1’.
Reading the PORTE register
the status of the pins, whereas writing to it will write to
the
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
(LATE). RE3 reads ‘0’ when MCLRE = 1.
12.6.1
The ANSELE register
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELE 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 ANSELE bits has no affect on digital
output functions. A pin with TRIS clear and ANSEL set
will still operate as a digital output, but the Input mode
will be analog. This can cause unexpected behavior
when executing read-modify-write instructions on the
affected port.
The TRISE register
pin output drivers, even when they are being used as
analog inputs. The user should ensure the bits in the
TRISE register are maintained set when using them as
analog inputs. I/O pins configured as analog input always
read ‘0’.
DS41452B-page 128
Note:
Note:
Example 12-1
PORT
PORTE Registers
RE<2:0>
available on PIC16(L)F1517/9 only.
ANSELE REGISTER
The ANSELE register must be initialized
to configure an analog channel as a digital
input. Pins configured as analog inputs
will read ‘0’.
latch.
(Register
shows how to initialize an I/O port.
and TRISE<2:0>
All
(Register
12-20) controls the PORTE
write
(Register
12-22) is used to
operations
12-19) reads
pins
are
Preliminary
are
12.6.2
PORTE has no peripheral outputs, so the PORTE
output has no priority function.
PORTE FUNCTIONS AND OUTPUT
PRIORITIES
 2010 Microchip Technology Inc.