AT43USB325 datasheet(62/109 Pages) ATMEL

62 / 109 page

3355C–USB–4/05

AT43USB325

7.6.1

Port F Data Register – PORTF

7.6.2

Port F Data Direction Register – DDRF

7.6.3

Port F Input Pin Address – PINF

The Port F Input Pins address - PINF - is not a register, and this address enables access to the

physical value on each Port F pin. When reading PORTF, the Port F Data Latch is read, and

when reading PINF, the logical values present on the pins are read.

7.6.4

Port F as General Digital I/O

PFn, General I/O Pin: 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. The value of PORTFn has no meaning in this

mode. The Port F pins are tri-stated when a reset condition becomes active.

Note:

n: 3,2,1, pin number

Bit

$06($26)

PORTF3

PORTF2

PORTF1

PORTF

Read/Write

R/W

Initial Value

Bit

$05($25)

DDF3

DDF2

DDF1

DDRF

Read/Write

R/W

Initial Value

Bit

$04($24)

PINF3

PINF2

PINF1

PINF

Read/Write

Initial Value

N/A

Table 7-6.

DDFn Bits on Port F Pins

DDFn

PORTFn

I/O

Comment

Input

Tri-state (Hi-Z)

Input

Tri-state (Hi-Z)

Output

Push-pull Zero Output

Output

Push-pull One Output

AT43USB325 Datasheet(PDF) 62 Page - ATMEL Corporation

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