AT90USB646 datasheet(7/459 Pages) ATMEL

7 / 459 page

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

also

se r v e s

the

fun c tion s

va r i ous

spe c ial

fe atu r es

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

also

se r v e s

the

fun c tion s

va r i ous

spe c ial

fe atu r es

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

also

ser v es

th e

f unct i ons

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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