AT43USB325E-AU Atmel, AT43USB325E-AU Datasheet - Page 59

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

Specifications of AT43USB325E-AU

• 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: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.4
7.4.1
7.4.2
7.4.3
3355C–USB–4/05
Port D
Port D Data Register – PORTD
Port D Data Direction Register – DDRD
Port D Input Pins Address – PIND
Port D is a 7-bit bi-directional I/O port.
Three I/O memory address locations are allocated for the Port D, one each for the Data Register
- PORTD, $12($32), Data Direction Register - DDRD, $11($31) and the Port D Input Pins -
PIND, $10($30). The Port D Input Pins address is read only, while the Data Register and the
Data Direction Register are read/write. Some Port D pins have alternate functions as shown in
the following table:
Table 7-2.
When the pins are used for the alternate function the DDRD and PORTD register has to be set
according to the alternate function description.
The Port D Input Pins address (PIND) is not a register, and this address enables access to the
physical value on each Port D pin. When reading PORTD, the Port D Data Latch is read, and
when reading PIND, the logical values present on the pins are read.
Port Pin
PD1
PD3
PD4
PD5
PD6
PD7
Initial Value
Read/Write
Initial Value
Read/Write
Initial Value
Read/Write
$10 ($30)
$12 ($32)
$11 ($31)
Bit
Bit
Bit
PORTD7
PIND7
DDD7
R/W
R/W
Port D Pins Alternate Functions
N/A
R
7
0
7
0
7
PORTD6
DDD6
PIND6
R/W
R/W
N/A
6
0
6
0
R
6
PORTD5
DDD5
PIND5
R/W
R/W
Alternate Function
T1 (Timer/Counter1 External Counter Input)
INT1 (External Interrupt 1 Input)
INTA (External Interrupt A Input)
INTB (External Interrupt B Input)
INTC (External Interrupt C Input)
INTD (External Interrupt D Input)
N/A
5
0
R
5
0
5
PORTD4
PIND4
DDD4
R/W
R/W
N/A
4
0
4
0
R
4
PORTD3
PIND3
DDD3
R/W
R/W
N/A
3
0
3
0
R
3
N/A
2
–
–
0
2
–
–
0
2
–
–
PORTD1
PIND1
AT43USB325
DDD1
R/W
R/W
N/A
R
1
1
0
1
0
PORTD0
PIND0
DDD0
R/W
R/W
N/A
R
0
0
0
0
0
PORTD
DDRD
PIND
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