ST7DALIF2 datasheet(65/171 Pages) STMICROELECTRONICS

65 / 171 page

ST7DALIF2

I/O ports

65/171

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.

For true open drain, these elements are not implemented.

Analog alternate function

Configure the I/O as floating input to use an ADC input. The analog multiplexer (controlled

by the ADC registers) switches the analog voltage present on the selected pin to the

common analog rail, connected to the ADC input.

Analog recommendations

Do not change the voltage level or loading on any I/O while conversion is in progress. Do not

have clocking pins located close to a selected analog pin.

Caution:

The analog input voltage level must be within the limits stated in the absolute maximum

ratings.

Table 26.

I/O configurations

Hardware configuration

NOTE 3

CONDITION

PAD

VDD

RPU

EXTERNAL INTERRUPT

POLARITY

DATA BUS

PULL-UP

INTERRUPT

DR REGISTER ACCESS

FROM

OTHER

PINS

SOURCE (eix)

SELECTION

CONDITION

ALTERNATE INPUT

ANALOG INPUT

To on-chip peripheral

COMBINATIONAL

LOGIC

NOTE 3

PAD

RPU

DATA BUS

DR REGISTER ACCESS

R/W

VDD

PAD

RPU

DATA BUS

DR REGISTER ACCESS

R/W

VDD

ALTERNATE

ENABLE

OUTPUT

BIT

From on-chip periphera

NOTE 3

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