AT43USB326-AC Atmel, AT43USB326-AC Datasheet - Page 41

• 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 A
3313D–USB–04/06
Port A is an 8-bit bi-directional I/O port with open drain outputs and controlled slew rate. It is
designed for use as the column driver in a keyboard controller. The Port A output buffers can
sink or source 4 mA.
Three I/O memory address locations are allocated for the Port A, one each for the Data Regis-
ter PORTA, $1B($3B), Data Direction Register (DDRA), $1A($3A) and the Port A Input Pins
(PINA) $19($39). The Port A Input Pins address is read only, while the Data Register and the
Data Direction Register are read/write.
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.
Initial Value
Read/Write
Initial Value
Read/Write
Initial Value
Read/Write
$1B ($3B)
$1A ($3A)
$19 ($39)
Bit
Bit
Bit
PORTA7
PINA7
DDA7
R/W
R/W
N/A
R
7
0
7
0
7
PORTA6
PINA6
DDA6
R/W
R/W
N/A
6
0
R
6
0
6
PORTA5
PINA5
DDA5
R/W
R/W
N/A
5
0
5
0
5
R
PORTA4
PINA4
DDA4
R/W
R/W
N/A
R
4
0
4
0
4
PORTA3
PINA3
DDA3
R/W
R/W
N/A
3
0
R
3
0
3
PORTA2
PINA2
DDA2
R/W
R/W
N/A
R
2
0
2
0
2
AT43USB326
PORTA1
PINA1
DDA1
R/W
R/W
N/A
R
1
0
1
0
1
PORTA0
PINA0
DDA0
R/W
R/W
N/A
R
0
0
0
0
0
DDRA
PINA
PORTA
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