ST7LUS5 datasheet(60/124 Pages) STMICROELECTRONICS

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I/O ports

ST7LUS5, ST7LU05, ST7LU09

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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.

Warning:

The analog input voltage level must be within the limits

stated in the absolute maximum ratings.

9.3

Unused I/O pins

Unused I/O pins must be connected to fixed voltage levels. Refer to Section 12.8.

9.4

Low power modes

9.5

Interrupts

The external interrupt event generates an interrupt if the corresponding configuration is

selected with DDR and OR registers and the interrupt mask in the CC register is not active

(RIM instruction).

Table 29.

Effect of ow power modes on I/O ports

Mode

Description

Wait

No effect on I/O ports. External interrupts cause the device to exit from WAIT mode.

Halt

No effect on I/O ports. External interrupts cause the device to exit from Halt mode.

Table 30.

I/O port interrupt control/wake-up capability

Interrupt event

Event flag

Enable

control bit

Exit from

Wait

Exit from

Halt

External interrupt on selected

external event

DDRx, ORx

Yes

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