AT43USB320A-AC Atmel, AT43USB320A-AC Datasheet - Page 64

• Manufacturer Part Number: AT43USB320A-AC
• Description: IC USB MCU EMBED HUB AVR 100LQFP
• Manufacturer: Atmel
• Series: AVR®r

Specifications of AT43USB320A-AC

• Applications: USB Hub/Microcontroller
• Core Processor: AVR
• Controller Series: AT43USB
• Ram Size: 512 x 8
• Interface: SPI Serial, USB, UART
• Number Of I /o: 32
• Voltage - Supply: 4.4 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Program Memory Type: -

Port A as General
Digital I/O
Port B
64
AT43USB320A
(PINA) $19($39). The Port A Input Pins address is read only, while the Data Register and the
Data Direction Register are read/write.
The port pins have no selectable pull-up resistors.
Port A Data Register – PORTA
Port A Data Direction Register – DDRA
Port A Input Pins Address – PINA
The Port A Input Pins address (PINA) is not a register, and this address enables access to the
physical value on each Port A pin. When reading PORTA the Port A Data Latch is read, and
when reading PINA, the logical values present on the pins are read.
All 8 pins in Port A have equal functionality when used as digital I/O pins.
PAn, General I/O Pin: The DDAn bit in the DDRA register selects the direction of this pin, if
DDAn is set (one), PAn is configured as an output pin. If DDAn is cleared (zero), PAn is config-
ured as an input pin. If PORTAn 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 PORTAn has to be
cleared (zero) or the pin has to configured as an output pin. The Port A pins are tri-stated
when a reset condition becomes active, even if the clock is not active.
Table 23. DDAn Effects on Port A Pins
Note:
Port B is an 8-bit bi-directional I/O port. The Port B output buffers can sink or source 4 mA.
Initial Value
Read/Write
Initial Value
Read/Write
Initial Value
Read/Write
$1B ($3B)
$1A ($3A)
$19 ($39)
Bit
DDAn
Bit
Bit
0
0
1
1
n: 7,6...0, pin number.
PORTA7
PINA7
DDA7
R/W
R/W
N/A
R
7
0
7
7
0
PORTAn
0
1
0
1
PORTA6
PINA6
DDA6
R/W
R/W
N/A
6
0
R
6
0
6
PORTA5
PINA5
DDA5
R/W
R/W
N/A
R
5
0
5
5
0
Output
Output
Input
Input
I/O
PORTA4
PINA4
DDA4
R/W
R/W
N/A
R
4
0
4
4
0
Comment
Tri-state (Hi-Z)
Tri-state (Hi-Z)
Push-Pull Zero Output
Push-Pull One Output
PORTA3
PINA3
DDA3
R/W
R/W
N/A
R
3
0
3
3
0
PORTA2
PINA2
DDA2
R/W
R/W
N/A
2
0
R
2
0
2
PORTA1
PINA1
DDA1
R/W
R/W
N/A
1
0
R
1
0
1
PORTA0
PINA0
DDA0
R/W
R/W
N/A
R
0
0
0
0
0
1443E–USB–4/04
DDRA
PINA
PORTA