AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 18

• 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

3.7
3.7.1
18
USB Hub
AT43USB325
USB Function
Table 3-5.
All AT43USB325 I/O and peripherals, except for the USB hardware registers, are placed in the
I/O space. The I/O locations are accessed by the IN and OUT instructions transferring data
between the 32 general-purpose working registers and the I/O space. I/O registers within the
address range $00 – $1F are directly bit-accessible using the SBI and CBI instructions. In these
registers, the value of single bits can be checked by using the SBIS and SBIC instructions. Refer
to the instruction set documentations of the AVR for more details. When using the I/O specific
commands, IN and OUT, the I/O address $00 – $3F must be used. When addressing I/O regis-
ters as SRAM, $20 must be added to this address. All I/O register addresses throughout this
document are shown with the SRAM address in parentheses.
For compatibility with future devices, reserved bits should be written to zero if accessed.
Reserved I/O memory addresses should never be written.
A block diagram of the USB hardware of the AT43USB325 is shown in
of the AT43USB325 has 5 downstream ports. The embedded function is permanently attached
to Port 1. Ports 2, 3, 4 and 5 are available as external ports. The actual number of ports used is
strictly defined by the firmware of the AT43USB325 and can vary from 0 to 4. Because the exact
configuration is defined by firmware, these ports may even function as permanently attached
ports as long as the Hub Descriptor identifies them as such.
The embedded USB function has its own device address and has a default endpoint plus 3 other
programmable endpoints with their own 8-byte FIFOs. Endpoints 1 and 2 can be programmed
as interrupt IN or OUT or bulk IN or OUT endpoints.
I/O (SRAM)
$15 ($35)
$14 ($34)
$13 ($33)
$12 ($32)
$11 ($31)
$10 ($30)
$06 ($26)
$05 ($25)
$04 ($24)
$03 ($23)
$02 ($22)
$01 ($21)
Address
I/O Memory Space (Continued)
PORTC
PORTD
PORTE
PORTF
DDRC
DDRD
Name
DDRF
DDRE
PINC
PIND
PINE
PINF
Function
Data Register, Port C
Data Direction Register, Port C
Input Pins, Port C
Data Register, Port D
Data Direction Register, Port D
Input Pins, Port D
Data Register, Port F
Data Direction Register, Port F
Input Pins, Port F
Data Register, Port E
Data Direction Register, Port E
Input Pins, Port E
Figure
3-3. The USB hub
3355C–USB–4/05