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AT90USB646 Datasheet(PDF) 284 Page - ATMEL Corporation

Part # AT90USB646
Description  Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  434 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 284 Page - ATMEL Corporation

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284
7593A–AVR–02/06
AT90USB64/128
• Frame Number Lower Flag
Set by hardware. These bits are the 8 LSB of the 11-bits Frame Number information.
• 7-5 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 4 - FNCERR -Frame Number CRC Error Flag
Set by hardware when a corrupted Frame Number in start of frame packet is received.
This bit and the SOFI interrupt are updated at the same time.
• 3-0 - Reserved
The value read from these bits is always 0. Do not set these bits.
22.19.2
USB device endpoint registers
• 7-3 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 2-0 - EPNUM2:0 Endpoint Number Bits
Load by software to select the number of the endpoint which shall be accessed by the CPU. See
Section 22.6, page 270 for more details.
EPNUM = 111b is forbidden.
Bit
765432
10
FNUM7:0
UDFNUML
Read/Write
RR
RRRRRR
Initial Value
000000
00
Bit
7
654321
0
-
-
-
FNCERR
-
-
-
-
UDMFN
Read/W
rite
R
Initial
Value
0
000000
0
Bit
7
654
321
0
-
-
-
-
-
EPNUM2:0
UENUM
Read/Write
RRR
RR
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Bit
7
654
321
0
-
EPRST6
EPRST5
EPRST4
EPRST3
EPRST2
EPRST1
EPRST0
UERST
Read/Write
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0



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