DOC7707 datasheet(6/307 Pages) ETC1

6 / 307 page

7707F–AVR–11/10

AT90USB82/162

2.2.4

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 various special features of the AT90USB82/162 as listed on

page 76.

2.2.5

Port D (PD7..PD0)

Port D serves as analog inputs to the analog comparator.

Port D also serves as an 8-bit bi-directional I/O port, if the analog comparator is not used (con-

cerns PD2/PD1 pins). Port pins can provide 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.

2.2.6

D-/SDATA

USB Full Speed Negative Data Upstream Port / Data port for PS/2

2.2.7

D+/SCK

USB Full Speed Positive Data Upstream Port / Clock port for PS/2

2.2.8

UGND

USB Ground.

2.2.9

UVCC

USB Pads Internal Regulator Input supply voltage.

2.2.10

UCAP

USB Pads Internal Regulator Output supply voltage. Should be connected to an external capac-

itor (1µF).

2.2.11

RESET/PC1/dW

Reset input. A low level on this pin for longer than the minimum pulse length will generate a

reset, even if the clock is not running. The minimum pulse length is given in Section 9.. Shorter

pulses are not guaranteed to generate a reset. This pin alternatively serves as debugWire chan-

nel or as generic I/O. The configuration depends on the fuses RSTDISBL and DWEN.

2.2.12

XTAL1

Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.

2.2.13

XTAL2/PC0

Output from the inverting Oscillator amplifier if enabled by Fuse. Also serves as a generic I/O.

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