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AT90USB646-16MU Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT90USB646-16MU Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 459 page  7 7593H–AVR–11/08 ATmega32U6/AT90USB64/128 2.2 Pin Descriptions 2.2.1 VCC Digital supply voltage. 2.2.2 GND Ground. 2.2.3 AVCC Analog supply voltage. 2.2.4 Port A (PA7..PA0) Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port A output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port A pins that are externally pulled low will source current if the pull-up resistors are activated. The Port A pins are tri-stated when a reset condition becomes active, even if the clock is not running. Por t A also se r v e s the fun c tion s of va r i ous spe c ial fe atu r es of the ATmega32U6/AT90USB64/128 as listed on page 79. 2.2.5 Port B (PB7..PB0) Port B is an 8-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 high sink and source capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up resistors are activated. The Port B pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port B has better driving capabilities than the other ports. Por t B also se r v e s the fun c tion s of va r i ous spe c ial fe atu r es of the ATmega32U6/AT90USB64/128 as listed on page 80. 2.2.6 Port C (PC7..PC0) Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up resistors are activated. The Port C pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port C also serves the functions of special features of the ATmega32U6/AT90USB64/128 as listed on page 83. 2.2.7 Port D (PD7..PD0) Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port D output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up resistors are activated. The Port D pins are tri-stated when a reset condition becomes active, even if the clock is not running. Por t D also ser v es th e f unct i ons of var i ous specia l f e at ur es o f the ATmega32U6/AT90USB64/128 as listed on page 84. |
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Similar Description - AT90USB646-16MU |
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