AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 70

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

Specifications of AT43USB325E-AC

• 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: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

8.1.10
70
AT43USB325
Interrupt/Bulk OUT Transfers at Function End-point EP1, 2 and 3
The firmware must first condition the end-point through the End-point Control Register, FEND-
P1/2/3_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.
Set UIAR[FEP1/2/3 INTACK] to clear the interrupt source
1. Read UISR
2. Read FCSR1/2/3
3. Read FIFO
4. Clear RX_OUT
Set end-point direction: clear EPDIR
Set interrupt or bulk: EPTYPE = 11 or 10
Enable end-point: set EPEN
If more data:
Wait for RX_OUT interrupt
If no more data: set DATA END
3355C–USB–4/05