AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 62

• Manufacturer Part Number: AT43USB325E-AC
• Description: IC USB KEYBOARD CTRLR HUB 64LQFP
• Manufacturer: Atmel
• Series: AVR®r

Specifications of AT43USB325E-AC

• Applications: Keyboard Controller
• Core Processor: AVR
• Program Memory Type: SRAM (16 kB)
• Controller Series: AT43USB
• Ram Size: 512 x 8
• Interface: SPI, 3-Wire Serial
• Number Of I /o: 42
• Voltage - Supply: 4.4 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

7.6.1
7.6.2
7.6.3
7.6.4
62
AT43USB325
Port F Data Register – PORTF
Port F Data Direction Register – DDRF
Port F Input Pin Address – PINF
Port F as General Digital I/O
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.
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.
Table 7-6.
Note:
Read/Write
Initial Value
Read/Write
Initial Value
Read/Write
Initial Value
$06($26)
$05($25)
$04($24)
Bit
Bit
Bit
DDFn
n: 3,2,1, pin number
0
0
1
1
R/W
R/W
N/A
DDFn Bits on Port F Pins
7
0
R
7
0
7
-
-
-
PORTFn
R/W
R/W
N/A
R
6
0
6
6
0
-
-
-
0
1
0
1
R/W
R/W
N/A
5
0
R
5
0
-
5
-
-
Output
Output
R/W
Input
Input
R/W
N/A
I/O
4
0
R
4
0
-
4
-
-
PORTF3
DDF3
PINF3
R/W
R/W
N/A
3
0
R
3
3
0
Comment
Tri-state (Hi-Z)
Tri-state (Hi-Z)
Push-pull Zero Output
Push-pull One Output
PORTF2
DDF2
PINF2
R/W
R/W
N/A
2
0
R
2
2
0
PORTF1
DDF1
PINF1
R/W
R/W
N/A
1
0
R
1
1
0
R/W
R/W
N/A
0
0
-
R
0
0
0
-
-
3355C–USB–4/05
PORTF
DDRF
PINF