ST62T52CMC datasheet(36/72 Pages) STMICROELECTRONICS

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I/O PORTS (Cont’d)

4.1.1 Operating Modes

Each pin may be individually programmed as input

or output with various configurations.

This is achieved by writing the relevant bit in the

Data (DR), Data Direction (DDR) and Option reg-

isters (OR). Table 11 illustrates the various port

configurations which can be selected by user soft-

ware.

4.1.1.1 Input Options

Pull-up, High Impedance Option. All input lines

can be individually programmed with or without an

internal pull-up by programming the OR and DR

registers accordingly. If the pull-up option is not

selected, the input pin will be in the high-imped-

ance state.

4.1.1.2 Interrupt Options

All input lines can be individually connected by

software to the interrupt system by programming

the OR and DR registers accordingly. The inter-

rupt trigger modes (falling edge, rising edge and

low level) can be configured by software as de-

scribed in the Interrupt Chapter for each port.

4.1.1.3 Analog Input Options

Some pins can be configured as analog inputs by

programming the OR and DR registers according-

ly. These analog inputs are connected to the on-

chip 8-bit Analog to Digital Converter. ONLY ONE

pin should be programmed as an analog input at

any time, since by selecting more than one input

simultaneously their pins will be effectively short-

ed.

Table 11. I/O Port Option Selection

Note: X = Don’t care

DDR

Mode

Option

Input

With pull-up, no interrupt

Input

No pull-up, no interrupt

Input

With pull-up and with interrupt

Input

Analog input (when available)

Output

Open-drain output (20mA sink when available)

Output

Push-pull output (20mA sink when available)

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