AT43USB355 datasheet(73/115 Pages) ATMEL

Teilenummer	AT43USB355

Bauteilbeschribung	Full-speed USB Microcontroller with Embedded Hub, ADC and PWM

PDF	115 Pages

Scroll/Zoom	100%

Hersteller	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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73 / 115 page

AT43USB355

2603G–USB–04/06

PortF as General

Digital I/O

PFn, General I/O Pin: In the AT43USB355E, after firmware downloading, the DDFn bit in the

DDRF register selects the direction of this pin. If DDFn is set (one), PFn is con-figured as an

output pin. If DDFn is cleared (zero), PFn is configured as an input pin. If PORTFn is set (one)

when the pin is configured as an input pin, the MOS pull-up resistor is activated. To switch the

pull-up resistor off, the PORTFn has to be cleared (zero) or the pin has to configured as an

output pin. The Port F pins are tri-stated when a reset condition becomes active, except PFO

of the AT43USB355E. This pin is dedicated as the slave select pin for the SEEPROM.

Note:

n: 3, 2, 1, pin number.

Table 29. DDFn Bits on Port F Pins

DDFn

PORTFn

I/O

Comment

Input

Tri-state (Hi-Z)

Input

PFn will source current if ext. pulled low.

Output

Push-Pull Zero Output

Output

Push-Pull One Output

AT43USB355 Datenblatt(PDF) 73 Page - ATMEL Corporation