AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 60

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

Specifications of AT43USB325E-AC

• 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: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

7.4.4
7.4.5
7.5
7.5.1
7.5.2
60
Port E
AT43USB325
Port D as General Digital I/O
Alternate Functions of Port D
Port E Data Register – PORTE
Port E Data Direction Register – DDRE
PDn, General I/O Pin: The DDDn bit in the DDRD register selects the direction of this pin. If
DDDn is set (one), PDn is con-figured as an output pin. If DDDn is cleared (zero), PDn is config-
ured as an input pin. The value of PORTDn has no meaning in this mode. The Port D pins are
tri-stated when a reset condition becomes active.
Table 7-3.
Note:
INT1, External Interrupt Source 1: The PD3 pin can serve as an external interrupt source to
the MCU. See the interrupt description for further details, and how to enable the source.
Port E[0:3] each is a bi-directional I/O port with open drain outputs and controlled slew rate and
is designed for use as the column drivers in a keyboard controller. The Port E[0:3] output buffers
can sink 4 mA. Port E[4:7] are bi-directional I/O with 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 Register
- PORTE, $03($23), Data Direction Register - DDRE, $02($22) and the Port E Input Pins - PINE,
$01($21). The Port E Input Pins address is read only, while the Data Register and the Data
Direction Register are read/write.
Read/Write
Initial Value
Read/Write
Initial Value
$02 ($22)
$03($23)
Bit
Bit
DDDn
n: 7,6,5,4,3,1,0, pin number
0
0
1
1
PORTE7
DDE7
R/W
R/W
DDDn Bits on Port D Pins
7
0
7
0
PORTE6
DDE6
PORTDn
R/W
R/W
6
0
6
0
0
1
0
1
PORTE5
DDE5
R/W
R/W
5
0
5
0
PORTE4
DDE4
R/W
R/W
Output
Output
4
0
4
0
Input
Input
I/O
PORTE3
DDE3
R/W
R/W
3
0
3
0
Comment
Tri-state (Hi-Z)
Tri-state (Hi-Z)
Push-pull Zero Output
Push-pull One Output
PORTE2
DDE2
R/W
R/W
2
0
2
0
PORTE1
DDE1
R/W
R/W
1
0
1
0
PORTE0
DDE0
R/W
R/W
0
0
0
0
3355C–USB–4/05
PORTE
DDRE