PIC16LF18854 Datasheet, PDF (230/668 Pages) Microchip Technology – C Compiler Optimized RISC Architecture

PIC16(L)F18856/76
12.12 PORTE Registers
(PIC16(L)F18856)
12.12.1 DATA REGISTER
PORTE is a 4-bit wide, bidirectional port. The
corresponding data direction register is TRISE
(Register 12-42). Setting a TRISE bit (= 1) will make
the corresponding PORTE pin an input (i.e., disable the
output driver). Clearing a TRISE bit (= 0) will make the
corresponding PORTE pin an output (i.e., enables
output driver and puts the contents of the output latch
on the selected pin). Example 12.4.9 shows how to
initialize PORTE.
Reading the PORTE register (Register 12-42) 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
(LATE).
12.12.2 INPUT THRESHOLD CONTROL
The INLVLE register (Register 12-44) controls the input
voltage threshold for each of the available PORTE
input pins. A selection between the Schmitt Trigger
CMOS or the TTL Compatible thresholds is available.
The input threshold is important in determining the
value of a read of the PORTE register and also the level
at which an interrupt-on-change occurs, if that feature
is enabled. See Table 37-4 for more information on
threshold levels.
Note:
Changing the input threshold selection
should be performed while all peripheral
modules are disabled. Changing the
threshold level during the time a module is
active may inadvertently generate a
transition associated with an input pin,
regardless of the actual voltage level on
that pin.
12.12.3 WEAK PULL-UP CONTROL
The WPUE register (Register 12-43) controls the
individual weak pull-ups for each port pin.
12.12.4 PORTE FUNCTIONS AND OUTPUT
PRIORITIES
Each pin defaults to the PORT latch data after Reset.
Other output functions are selected with the peripheral
pin select logic. See Section 13.0 “Peripheral Pin
Select (PPS) Module” for more information.
Analog input functions, such as ADC and comparator
inputs, are not shown in the peripheral pin select lists.
Digital output functions may continue to control the pin
when it is in Analog mode.
12.12.5 PORTE FUNCTIONS AND OUTPUT
PRIORITIES
Each pin defaults to the PORT latch data after Reset.
Other output functions are selected with the peripheral
pin select logic. See Section 13.0 “Peripheral Pin
Select (PPS) Module” for more information.
Analog input functions, such as ADC and comparator
inputs, are not shown in the peripheral pin select lists.
Digital output functions may continue to control the pin
when it is in Analog mode.
DS40001824A-page 230
Preliminary
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