AT43USB325E-AU Atmel, AT43USB325E-AU Datasheet - Page 32

• 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

4.13
4.13.1
32
USB Endpoint Interrupt Sources
AT43USB325
USB Interrupt Status Register – UISR
An assertion or activation of one or more bits in the endpoint's Control and Status Register trig-
gers the endpoint interrupts. These triggers are different for control and non-control endpoints as
described in the table below. Please refer to the Control and Status Register for more
information.
Table 4-4.
• Bit 7 – SOF INT: Start of Frame Interrupt
This bit is asserted after the USB hardware receives a valid SOF packet.
• Bit 6 – EOF2 INT: EOF2 Interrupt
This bit is asserted 10 clocks before the expected start of a frame.
• Bit 5 – Res: Reserved Bit
This bit is reserved and always reads as zero.
• Bit 4 – FEP3 INT: Function End-point 3 Interrupt
• Bit 3 – HEP0 INT: Hub Endpoint 0 Interrupt
• Bit 2 – FEP2 INT: Function Endpoint 2 Interrupt
• Bit 1 – FEP1 INT: Function Endpoint 1 Interrupt
• Bit 0 – FEP0 INT: Function Endpoint 0 Interrupt
The hub and function interrupt bits will be set by the hardware whenever the following bits in the
corresponding endpoint's Control and Status Register are modified by the USB hardware:
Bit
RX_OUT_PACKET
TX_COMPLETE
STALL_SENT
RX_SETUP
1. RX OUT Packet is set (control and OUT endpoints)
2. TX Packet Ready is cleared AND TX Complete is set (control and IN endpoints)
3. RX SETUP is set (control endpoints only)
4. TX Complete is set
Initial Value
Read/Write
$1FF7
Bit
SOF INT
USB Endpoint Interrupt Sources
7
R
0
EOF2 INT
R
6
0
R
5
–
0
FE3 INT
R
4
0
HEP0 INT
R
3
0
Endpoint type
CONTROL, OUT
CONTROL, IN
CONTROL, IN
CONTROL
FE2 INT
R
2
0
FE1 INT
R
1
0
FE0 INT
R
0
0
3355C–USB–4/05
UISR