AT43USB325E-AU Atmel, AT43USB325E-AU Datasheet - Page 67

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

Specifications of AT43USB325E-AU

• 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: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.1.4
8.1.5
3355C–USB–4/05
No-data Status Response State
Control Read Data Response State
The Function Interface Unit receives an IN token from the Host. The FIU responds with a zero
length DATA1 packet until receiving an ACK from the host, then asserts a TX_COMPLETE
interrupt.
The Function Interface Unit receives an IN token from the Host. The FIU responds with NAKs
until TX_PACKET_READY is set. The FIU then sends the data in the FIFO upstream, retrying
u n t i l i t s u c c e s s f u l l y r e c e i v e s a n A C K f r o m t h e h o s t . F i n a l l y , t h e F I U c l e a r s t h e
TX_PACKET_READY bit and asserts a TX_COMPLETE interrupt.
1. IN token from Host
2. Send DATA1(0)
3. ACK from Host
4. Set TX COMPLETE
1. IN token from Host
2. a. If TX Packet Ready = 1, send
3. ACK from Host
4. Clear TX Packet Ready
b. If TX Packet Ready = 0, send
NAK
Set TX Complete
DATA0/DATA1
Hardware
Hardware
INT
INT
Repeat steps 1 through 8
5. Read UISR
6. Read CSR0
7. If SET ADDRESS, program the
8. Clear TX_COMPLETE, clear Data
9. Set UIAR[EP0 INTACK]
5. Read UISR
6. Read CSR0
7. Clear TX COMPLETE in CAR0:
8. Set UIAR[EP0 INTACK] to clear
new Address, set ADD_EN bit
End, set Force STALL in CAR0
a. If more data: fill FIFO, set TX
Packet Ready, set DIR in CAR0
b. If no more data: set Force
STALL, set DATA END in CAR0
interrupt source
Firmware
Firmware
AT43USB325
67