At8xc51snd1c – Rainbow Electronics AT89C51SND1C User Manual
Page 107
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107
AT8xC51SND1C
4109E–8051–06/03
Table 101. UBYCTX Register
UBYCTX (S:E2h) – USB Endpoint X Byte Count Register (X = EPNUM set in UEPNUM)
Reset Value = 0000 0000b
Table 102. UFNUML Register
UFNUML (S:BAh, Read-only) – USB Frame Number Low Register
Reset Value = 00h
7
6
5
4
3
2
1
0
-
BYCT6
BYCT5
BYCT4
BYCT3
BYCT2
BYCT1
BYCT0
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.
7
6
5
4
3
2
1
0
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.
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