ST92141 datasheet(11/179 Pages) STMICROELECTRONICS

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ST92141 - GENERAL DESCRIPTION

1.2.1 I/O Port Configuration

All ports can be individually configured as input, bi-

directional, output, or alternate function. Refer to

the Port Bit Configuration Table in the I/O Port

Chapter.

All I/Os are implemented with a High Hysteresis or

Standard Hysteresis Schmitt trigger function (See

Electrical Characteristics).

Weak Pull-Up = This column indicates if a weak

pull-up is present or not (refer to Table 3).

– If WPU = yes, then the WPU can be enabled/dis-

able by software

– If WPU = no, then enabling the WPU by software

has no effect

All port output configurations can be software se-

lected on a bit basis to provide push-pull or open

drain driving capabilities. For all ports, when con-

figured as open-drain, the voltage on the pin must

never exceed the VDD power line value (refer to

Electrical characteristics section).

1.2.2 I/O Port Reset State

I/Os are reset asynchronously as soon as the RE-

SET pin is asserted low.

All I/Os are forced by the Reset in "floating input"

configuration mode.

WARNING

When a common pin is declared to be connected

to an alternate function input and to an alternate

function output, the user must be aware of the fact

that the alternate function output signal always in-

puts to the alternate function module declared as

input.

When any given pin is declared to be connected to

a digital alternate function input, the user must be

aware of the fact that the alternate function input is

always connected to the pin. When a given pin is

declared to be connected to an analog alternate

function input (ADC input for example) and if this

pin is programmed in the "AF-OD" mode, the digit-

al input path is disconnected from the pin to pre-

vent any DC consumption.

Table 3. I/O Port Characteristics

Legend: OD = Open Drain; HC= High current

Input

Output

Weak Pull-Up Reset State

Port 3[4:0]

Port 3[6:5]

Schmitt trigger (High Hysteresis)

Push-Pull/OD

Push-Pull/OD (HC)

Yes

Floating input

Port 5.0

Port 5.1

Port 5.2

Port 5[7:3]

Schmitt trigger (High Hysteresis)

Schmitt trigger (Standard Hysteresis)

Push-Pull/OD (HC)

Push-Pull/OD

Push-Pull/OD (HC)

Push-Pull/OD

Yes

Floating input

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