PIC16F18323-ESLASHRFQTP datasheet(126/442 Pages) MICROCHIP

126 / 442 page

PIC16(L)F18313/18323

DS40001799A-page 126

Preliminary

 2015 Microchip Technology Inc.

11.0

I/O PORTS

TABLE 11-1:

PORT AVAILABILITY PER

DEVICE

Each port has ten standard registers for its operation.

These registers are:

• PORTx registers (reads the levels on the pins of

the device)

• LATx registers (output latch)

• TRISx registers (data direction)

• ANSELx registers (analog select)

• WPUx registers (weak pull-up)

• INLVLx (input level control)

• SLRCONx registers (slew rate)

• ODCONx registers (open-drain)

Most port pins share functions with device peripherals,

both analog and digital. In general, when a peripheral

is enabled on a port pin, that pin cannot be used as a

general purpose output; however, the pin can still be

read.

The Data Latch (LATx registers) is useful for

read-modify-write operations on the value that the I/O

pins are driving.

A write operation to the LATx register has the same

effect as a write to the corresponding PORTx register.

A read of the LATx register reads of the values held in

the I/O PORT latches, while a read of the PORTx

Ports that support analog inputs have an associated

ANSELx register. When an ANSEL bit is set, the digital

input buffer associated with that bit is disabled.

Disabling the input buffer prevents analog signal levels

on the pin between a logic high and low from causing

excessive current in the logic input circuitry. A

simplified model of a generic I/O port, without the

interfaces to other peripherals, is shown in Figure 11-1.

FIGURE 11-1:

GENERIC I/O PORT

OPERATION

11.1

I/O Priorities

Each pin defaults to the PORT data latch after Reset.

Other functions are selected with the peripheral pin

select logic. See Section 12.0, 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.

These inputs are active when the I/O pin is set for

Analog mode using the ANSELx register. Digital output

functions may continue to control the pin when it is in

Analog mode.

Analog outputs, when enabled, take priority over the

digital outputs and force the digital output driver to the

high-impedance state.

Device

PIC16(L)F18313

●

PIC16(L)F18323

●●

Write LATx

Data Register

I/O pin

Read PORTx

Write PORTx

TRISx

Read LATx

Data Bus

To digital peripherals

ANSELx

VDD

VSS

To analog peripherals

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