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ATmega169PV-8MCH 数据表(PDF) 70 Page - ATMEL Corporation |
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ATmega169PV-8MCH 数据表(HTML) 70 Page - ATMEL Corporation |
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70 / 393 page  70 8018N–AVR–08/09 ATmega169P 13.2.6 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 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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