AT43USB355M-AC ATMEL [ATMEL Corporation], AT43USB355M-AC Datasheet - Page 79

• Manufacturer Part Number: AT43USB355M-AC
• Description: Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
• Manufacturer: ATMEL [ATMEL Corporation]

Control Write Status
Response State
2603G–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
AT43USB355
79