AT43USB325E-AU Atmel, AT43USB325E-AU Datasheet - Page 68

• 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

8.1.6
8.1.7
68
AT43USB325
Control Read Status Response State
Control Write Data Response State
The Function Interface Unit receives an OUT token from the Host with a zero length DATA1
packet. The FIU responds with a NAK until TX_COMPLETE is cleared. The FIU will then ACK
the retried OUT token from the Host and assert an RX_OUT interrupt.
The Function Interface Unit receives an OUT token from the Host with a DATA packet. The FIU
places the incoming data into the FIFO, issues an ACK to the host, and asserts an RX_OUT
interrupt.
1. OUT token from Host
2. DATA1(0) from Host
3. TX Complete = 0 ?
1. OUT token from Host
2. Put DATA0/DATA1 into FIFO
3. ACK to Host
4. Set RX OUT
a. If yes, ACK to Host
Set RX OUT
b. If no, NAK to Host
Hardware
Hardware
INT
INT
Repeat steps 1 through 9 until last DATA PACKET:
4. Read UISR
5. Read CSR0
6. Clear RX OUT, set Data End, set
7. Set UIAR[EP0 INTACK] to clear
5. Read UISR
6. Read CSR0
7. Read FIFO
8. Clear RX OUT
9. Set UIAR[EP0 INTACK] to clear
Force Stall in H/FCAR0.
Note: A SETUP token will clear
Data End, therefore, it is not
cleared by FW in case Host retries.
interrupt source
If last data packet, set Force
STALL, set DATA END.
the interrupt source
Firmware
Firmware
3355C–USB–4/05