ATA8743 ATMEL Corporation, ATA8743 Datasheet - Page 77
ATA8743
Manufacturer Part Number
ATA8743
Description
Manufacturer
ATMEL Corporation
Datasheet
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19.2.6
19.3
9152A–INDCO–07/09
Alternate Port Functions
Unconnected Pins
If some pins are unused, it is recommended to ensure that these pins have a defined level. Even
though most of the digital inputs are disabled in the deep sleep modes as described above, float-
ing inputs should be avoided to reduce current consumption in all other modes where the digital
inputs are enabled (Reset, Active mode and Idle mode).
The simplest method to ensure a defined level of an unused pin, is to enable the internal pull-up.
In this case, the pull-up will be disabled during reset. If low power consumption during reset is
important, it is recommended to use an external pull-up or pulldown. Connecting unused pins
directly to V
accidentally configured as an output.
Most port pins have alternate functions in addition to being general digital I/Os.
page 78
be overridden by alternate functions. The overriding signals may not be present in all port pins,
but the figure serves as a generic description applicable to all port pins in the AVR microcon-
troller family.
shows how the port pin control signals from the simplified
CC
or GND is not recommended, since this may cause excessive currents if the pin is
Figure 19-2 on page 73
ATA8743
Figure 19-5 on
can
77
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