AT43USB326-AC Atmel, AT43USB326-AC Datasheet - Page 44

• Manufacturer Part Number: AT43USB326-AC
• Description: IC USB KEYBOARD CTRLR HUB 48LQFP
• Manufacturer: Atmel
• Series: AVR®r

Specifications of AT43USB326-AC

• Applications: Keyboard Controller
• Core Processor: AVR
• Program Memory Type: Mask ROM (16 kB)
• Controller Series: AT43USB
• Ram Size: 512 x 8
• Interface: USB
• 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: 48-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Port D
44
AT43USB326
Port D is a 2-bit bi-directional I/O port. Its output buffers can sink or source 2 mA.
Three I/O memory address locations are allocated for the Port D, one each for the Data Regis-
ter - 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.
Port D Data Register – PORTD
Port D Data Direction Register – DDRD
Port D Input Pins Address – PIND
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.
Initial Value
Read/Write
Initial Value
Read/Write
Initial Value
Read/Write
$12 ($32)
$11 ($31)
$10 ($30)
Bit
Bit
Bit
N/A
R
R
7
–
0
R
7
–
0
7
–
N/A
R
6
–
R
0
6
–
0
R
6
–
N/A
R
R
5
–
0
5
–
0
R
5
–
N/A
R
R
R
4
–
0
4
–
0
4
–
N/A
R
R
R
3
–
0
3
–
0
3
–
N/A
R
R
R
2
–
2
–
0
2
–
0
PORTD1
PIND1
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
3313D–USB–04/06
PORTD
DDRD
PIND