AT43USB320A-AC Atmel, AT43USB320A-AC Datasheet - Page 76

• Manufacturer Part Number: AT43USB320A-AC
• Description: IC USB MCU EMBED HUB AVR 100LQFP
• Manufacturer: Atmel
• Series: AVR®r

Specifications of AT43USB320A-AC

• Applications: USB Hub/Microcontroller
• Core Processor: AVR
• Controller Series: AT43USB
• Ram Size: 512 x 8
• Interface: SPI Serial, USB, UART
• 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: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Program Memory Type: -

Interrupt/Bulk IN
Transfers at Function
Endpoint
Interrupt/Bulk OUT
Transfers at Function
Endpoint EP1 and 2
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AT43USB320A
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
u n til it su c ce s sf u lly r e ce iv e s a n AC K fr o m th e h o st . F ina lly , th e FI U cle a r s th e
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
1443E–USB–4/04