AT43USB325_05 Datasheet, PDF (72/109 Pages) ATMEL Corporation – Multimedia USB Keyboard Controller with Embedded Hub

8.3 Endpoint Registers
8.3.1 Hub Endpoint 0 Control Register – HENDP0_CR
8.3.2 Function Endpoint 0 Control Register – FENDP0_CR
Bit
7
6
5
4
3
2
1
0
$1FE7
EPEN
–
–
–
DTGLE EPDIR EPTYPE1 EPTYPE0 HENDP0_CR
$24 ($44)
EPEN
–
–
–
DTGLE EPDIR EPTYPE1 EPTYPE0 FENDP0_CR
Read/Write
R/W
R
R
R
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
• 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.
72 AT43USB325
3355C–USB–4/05