at85c51snd3 ATMEL Corporation, at85c51snd3 Datasheet - Page 118

• Manufacturer Part Number: at85c51snd3
• Description: At85c51snd3 Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

USB Device Endpoint
Registers
118
AT85C51SND3B
Reset Value = 0000 0000b
Table 118. UDMFN Register
UDMFN (1.DEh) – USB Device Frame Number Register
Reset Value = 0000 0000b
Table 119. UENUM Register
UENUM (1.C9h) – USB Endpoint Number Selection Register
Reset Value = 0000 0000b
Number
Number
Number
7-0
7-5
2-0
7-3
2-0
Bit
Bit
Bit
7
4
3
7
-
-
MFNUM2:0
EPNUM2:0
Mnemonic Description
Mnemonic Description
Mnemonic Description
FNUM7:0
FNCERR
Bit
Bit
Bit
6
6
-
-
-
-
-
Frame Number Lower Flag
Set by hardware. These bits are the 8 LSB of the 11-bits Frame Number
information.
Reserved
The value read from these bits is always 0. Do not set these bits.
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.
Reserved
The value read from this bit is always 0. Do not set this bit.
Micro-Frame Number Flag
Number of micro-frames (0 to 7) received in one frame. MFNUM is reset at the
beginning of each new frame (every 1 ms).
Reserved
The value read from these bits is always 0. Do not set these bits.
Endpoint Number Bits
Set to select the number of the endpoint which shall be accessed by the CPU or
by the DFC depending on UPNUMS bit in UECONX. See Section “Endpoint
Selection” for more details.
EPNUM = 111b is forbidden.
5
5
-
-
FNCERR
4
4
-
3
3
-
-
EPNUM2
2
2
MFNUM2:0
EPNUM1
1
1
7632D–MP3–01/07
EPNUM0
0
0