AT43USB326-AC Atmel, AT43USB326-AC Datasheet - Page 52

• 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

Interrupt/Bulk IN
Transfers at Function
Endpoint
Interrupt/Bulk OUT
Transfers at Function
Endpoint EP1 and 2
52
AT43USB326
The firmware must first condition the endpoint through the Endpoint Control Register,
FENDP1/2_CNTR:
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
until it successfully receives an ACK from the host. Finally, the FIU clears the
TX_PACKET_READY bit and asserts a TX_COMPLETE interrupt.
1. Read UISR
2. Read FCSR1/2
3. Clear TX_COMPLETE
4. Set UIAR[FEP1/2 INTACK] to clear the interrupt source
The firmware must first condition the endpoint through the Endpoint Control Register,
FENDP1/2_CNTR:
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. Read UISR
2. Read FCSR1/2
3. Read FIFO
4. Clear RX_OUT
5. Set UIAR[FEP1/2 INTACK] to clear the interrupt source
Set endpoint direction: set EPDIR
Set interrupt or bulk: EPTYPE = 11 or 10
Enable endpoint: set EPEN
If more data: fill FIFO, set TX Packet Ready
Wait for TX_COMPLETE interrupt
If no more data: set DATA END in FCAR1/2
Set endpoint direction: clear EPDIR
Set interrupt or bulk: EPTYPE = 11 or 10
Enable endpoint: set EPEN
If more data:
Wait for RX_OUT interrupt
If no more data: set DATA END
3313D–USB–04/06