ST72561AR7-Auto datasheet(76/324 Pages) STMICROELECTRONICS

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I/O ports

ST72561-Auto

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Doc ID 12370 Rev 8

Caution:

The alternate function must not be activated as long as the pin is configured as input with

interrupt, in order to avoid generating spurious interrupts.

Analog alternate function

When the pin is used as an ADC input, the I/O must be configured as floating input. The

analog multiplexer (controlled by the ADC registers) switches the analog voltage present on

the selected pin to the common analog rail which is connected to the ADC input.

It is recommended not to change the voltage level or loading on any port pin while

conversion is in progress. Furthermore it is recommended not to have clocking pins located

close to a selected analog pin.

Table 27.

I/O port configurations

Hardware configuration

When the I/O port is in input configuration and the associated alternate function is enabled as an output,

reading the DR register will read the alternate function output status.

When the I/O port is in output configuration and the associated alternate function is enabled as an input,

the alternate function reads the pin status given by the DR register content.

CONDITION

PAD

VDD

RPU

EXTERNAL INTERRUPT

DATA BUS

PULL-UP

INTERRUPT

DR REGISTER ACCESS

SOURCE (eix)

CONDITION

ALTERNATE INPUT

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

ANALOG INPUT

PAD

RPU

DATA BUS

DR REGISTER ACCESS

R/W

VDD

ALTERNATE

ENABLE

OUTPUT

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

PAD

RPU

DATA BUS

DR REGISTER ACCESS

R/W

VDD

ALTERNATE

ENABLE

OUTPUT

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

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