AT43USB326-AC Atmel, AT43USB326-AC Datasheet - Page 45

• 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 E
3313D–USB–04/06
Port E[0,1] are bi-directional I/O ports with open drain outputs and controlled slew rate and are
designed for use as the column drivers in a keyboard controller. The Port E[0,1] output buffers
can sink 4 mA. Port E[4:7] are bi-directional I/O with open drain outputs capable of driving
LEDs directly. Each pin of Port E[4:7] has a series resistor to limit the LEDs current.
Three I/O memory address locations are allocated for the Port E, one each for the Data Regis-
ter – PORTE, $03($23), Data Direction Register – DDRE, $02($22) and the Port E Input Pins
– PINE, $01($21). The Port E Input Pin’s address is read only, while the Data Register and the
Data Direction Register are read/write.
Port E Data Register – PORTE
Port E Data Direction Register – DDRE
Port E Input Pins Address – PINE
The Port E Input Pins Address – PINE (Port E Input Pins) – is not a register, and this address
enables access to the physical value on each Port E pin. When reading PORTE the Port E
Data Latch is read, and when reading PINE, the logical values present on the pins are read.
Read/Write
Initial Value
Read/Write
Initial Value
Read/Write
Initial Value
$02 ($22)
$01 ($21)
$03($23)
Bit
Bit
Bit
PORTE7
PINE7
DDE7
R/W
R/W
R/W
N/A
7
0
7
0
7
PORTE6
PINE6
DDE6
R/W
R/W
R/W
N/A
6
0
6
0
6
PORTE5
PINE5
DDE5
R/W
R/W
R/W
N/A
5
0
5
0
5
PORTE4
PINE4
DDE4
R/W
R/W
R/W
N/A
4
0
4
0
4
N/A
R
R
R
3
–
0
3
–
0
3
–
N/A
R
R
R
2
–
0
2
–
0
2
–
PORTE1
AT43USB326
PINE1
DDE1
R/W
N/A
R
R
1
0
1
0
1
PORTE0
PINE0
DDE0
R/W
N/A
0
R
0
0
0
0
R
PORTE
DDRE
PINE
45