AT43USB320A_04 ATMEL [ATMEL Corporation], AT43USB320A_04 Datasheet - Page 75

• Manufacturer Part Number: AT43USB320A_04
• Description: Full-speed USB Microcontroller with an Embedded Hub
• Manufacturer: ATMEL [ATMEL Corporation]

Control Write Status
Response State
1443E–USB–4/04
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
AT43USB320A
75