AT43USB326-AC Atmel, AT43USB326-AC Datasheet - Page 51

• 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

Control Write Status
Response State
3313D–USB–04/06
The Function Interface Unit receives an IN token from the Host. The FIU responds with a zero
length DATA1 packet, retrying until it receives an ACK back from the Host. The FIU then
asserts a TX_COMPLETE interrupt.
1. IN token from Host
2. Send Data1(0)
3. ACK from Host
4. Set TX Complete → INT
Hardware
5. Read UISR
6. Read CSR0
7. Clear TX COMPLETE, clear Data
8. Set UIAR[EP0 INTACK] to clear the
End, set Force STALL in CAR0
interrupt source
Firmware
AT43USB326
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