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ATMEGA640 Datasheet(PDF) 88 Page - ATMEL Corporation |
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ATMEGA640 Datasheet(HTML) 88 Page - ATMEL Corporation |
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88 / 449 page  88 ATmega640/1280/1281/2560/2561 2549K–AVR–01/07 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. |
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