ST6373 datasheet(30/64 Pages) STMICROELECTRONICS

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ST6373

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I/O PORTS (Cont’d)

4.1.1 Details of I/O Ports A and B

Each pin of Ports A and B can be individually pro-

grammed as input or output with different input

and output configurations.

This is achieved by writing the relevant bit in the

data register (DR), data direction register (DDR)

and option register (OR). Table 8 shows all the

port configurations that can be selected by user

software.

4.1.1.1 Input Option Description

Pull-up, High Impedance Option. All the input

lines can be individually programmed with or with-

out an internal pull-up according to the codes pro-

grammed in the OR and DR registers. If the pull-up

is not selected, the input pin is in the high imped-

ance state.

Interrupt Option. All the input lines can be individ-

ually connected by software to the interrupt lines of

the MCU core according to the codes programmed

in the OR and DR registers. The pins of Port A and

B are “ORed” and are connected to the interrupt

associated to the vector #1.

Analog Input Option. The PB0-PB7 pins can be

configured to be analog inputs according to the

codes programmed in the OR and DR registers.

These analog inputs are connected to the on-chip

8-bit Analog to Digital Converter. ONLY ONE pin

should be programmed as analog input at a time,

otherwise the selected inputs will be shorted.

Table 8. I/O Port Options Selection (Ports A and B only)

Note X: Means don’t care.

DDR

Mode

Option

Input

With pull-up, no interrupt (Reset state)

Input

No pull-up, no interrupt

Input

With pull-up, with interrupt

011

Input

No pull-up, no interrupt (Port A pins)

Input

Analog input (Port B pins)

Output

Open-drain output (10mA sink current for Port A pins)

Output

Push-pull output (10mA sink current for Port A pins)

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