ATTINY13 datasheet(48/177 Pages) ATMEL

48 / 177 page

ATtiny13

2535G–AVR–01/07

when resuming from the above mentioned Sleep mode, as the clamping in these sleep

mode produces the requested logic change.

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, floating 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 pull-down.

Connecting unused pins directly to V

CC or GND is not recommended, since this may

cause excessive currents if the pin is accidentally configured as an output.

Alternate Port Functions

Most port pins have alternate functions in addition to being general digital I/Os. Figure

24 shows how the port pin control signals from the simplified Figure 21 can be overrid-

den 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 micro-

controller family.

ATTINY13 Datasheet(PDF) 48 Page - ATMEL Corporation