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AT83SND1CXXX-ROTIL Scheda tecnica(PDF) 106 Page - ATMEL Corporation

Il numero della parte AT83SND1CXXX-ROTIL
Spiegazioni elettronici  Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
PDF  212 Pages
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83SND1CXXX-ROTIL Scheda tecnica(HTML) 106 Page - ATMEL Corporation

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106
4109J–8051–10/06
AT8xC51SND1C
Reset Value = 0000 0000b
Table 92. UFNUML Register
UFNUML (S:BAh, Read-only) – USB Frame Number Low Register
Reset Value = 00h
Table 93. UFNUMH Register
UFNUMH (S:BBh, Read-only) – USB Frame Number High Register
Reset Value = 00h
Bit
Number
Bit
Mnemonic
Description
7-
Reserved
The value read from this bits is always 0. Do not set this bit.
6 - 0
BYCT7:0
Byte Count
Byte count of a received data packet. This Byte count is equal to the number of
data Bytes received after the Data PID.
7654
3210
FNUM7
FNUM6
FNUM5
FNUM4
FNUM3
FNUM2
FNUM1
FNUM0
Bit
Number
Bit
Mnemonic
Description
7 - 0
FNUM7:0
Frame Number
Lower 8 bits of the 11-bit Frame Number.
7654
3210
-
-
CRCOK
CRCERR
-
FNUM10
FNUM9
FNUM8
Bit
Number
Bit
Mnemonic
Description
7 - 3
-
Reserved
The value read from these bits is always 0. Do not set these bits.
5CRCOK
Frame Number CRC OK Bit
Set by hardware after a non corrupted Frame Number in Start of Frame Packet is
received.
Updated after every Start Of Frame packet reception.
Note: The Start Of Frame interrupt is generated just after the PID receipt.
4
CRCERR
Frame Number CRC Error Bit
Set by hardware after a corrupted Frame Number in Start of Frame Packet is
received.
Updated after every Start Of Frame packet reception.
Note: The Start Of Frame interrupt is generated just after the PID receipt.
3-
Reserved
The value read from this bits is always 0. Do not set this bit.
2-0
FNUM10:8
Frame Number
Upper 3 bits of the 11-bit Frame Number. It is provided in the last received SOF
packet. FNUM does not change if a corrupted SOF is received.



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