PIC24F08KL402 datasheet(112/260 Pages) MICROCHIP

112 / 260 page

PIC24F16KL402 FAMILY

DS31037B-page 112

 2011 Microchip Technology Inc.

11.1.1

OPEN-DRAIN CONFIGURATION

In addition to the PORT, LAT and TRIS registers for

data control, each port pin can be individually

configured for either digital or open-drain output. This is

controlled by the Open-Drain Control register, ODCx,

associated with each port. Setting any of the bits

configures the corresponding pin to act as an

open-drain output.

The maximum open-drain voltage allowed is the same

as the maximum VIH specification.

11.1.2

I/O PORT WRITE/READ TIMING

One instruction cycle is required between a port

direction change or port write operation and a read

operation of the same port. Typically, this instruction

would be a NOP.

11.2

Configuring Analog Port Pins

The use of the ANS and TRIS registers control the

operation of the A/D port pins. The port pins that are

desired

analog

inputs

must

have

their

corresponding TRIS bit set (input). If the TRIS bit is

cleared (output), the digital output level (VOH or VOL)

will be converted.

When reading the PORTx register, all pins configured

as analog input channels will read as cleared (a low

level). Analog levels on any pin that is defined as a dig-

ital input (including the ANx pins) may cause the input

buffer to consume current that exceeds the device

specifications.

11.2.1

ANALOG SELECTION REGISTER

I/O pins with shared analog functionality, such as A/D

inputs and comparator inputs, must have their digital

inputs shut off when analog functionality is used. Note

that analog functionality includes an analog voltage

being applied to the pin externally.

To allow for analog control, the ANSx registers are

provided. There is one ANS register for each port

(ANSA and ANSB, Register 11-1 and Register 11-2).

Within each ANSx register, there is a bit for each pin

that shares analog functionality with the digital I/O

functionality. If a particular pin does not have an analog

function, that bit is unimplemented.

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