AT43USB325E-AU Atmel, AT43USB325E-AU Datasheet - Page 72

• 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

8.3
8.3.1
8.3.2
72
Endpoint Registers
AT43USB325
Hub Endpoint 0 Control Register – HENDP0_CR
Function Endpoint 0 Control Register – FENDP0_CR
• Bit 7 – EPEN: Endpoint Enable
0 = Disable endpoint
1 = Enable endpoint
• Bit 6..4 – Reserved
These bits are reserved in the AT43USB325 and will read as zero.
• Bit 3 – DTGLE: Data Toggle
Identifies DATA0 or DATA1 packets. This bit will automatically toggle and requires clearing by
the firmware only in certain special circumstances.
• Bit 2 – EPDIR: Endpoint Direction
0 = Out
1 = In
• Bit 1, 0 – EPTYPE: Endpoint Type
These bits must be programmed as 0, 0.
Initial Value
Read/Write
$24 ($44)
$1FE7
Bit
EPEN
EPEN
R/W
7
0
R
6
–
–
0
R
5
–
–
0
R
4
–
–
0
DTGLE
DTGLE
R/W
3
0
EPDIR
EPDIR
R/W
2
0
EPTYPE1
EPTYPE1
R/W
1
0
EPTYPE0
EPTYPE0
R/W
0
0
3355C–USB–4/05
HENDP0_CR
FENDP0_CR