* High Performance, Low Power AVR® 8-bit Microcontroller
* Advanced RISC Architecture
  – 120 Powerful Instructions
  – Most Single Cl.

1.1.1 VCC Supply voltage. 1.1.2 GND Ground. 1.1.3 Port B (PB3:PB0) Port B is a 4-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B output buffers have symmetrical drive characteristics with both hi.

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