Table 132. UBYCTX Register
UBYCTX (S:E2h) – USB Endpoint X Byte Count Register (X = EPNUM set in UEPNUM)
7
-
6
5
4
3
2
1
0
BYCT6
BYCT5
BYCT4
BYCT3
BYCT2
BYCT1
BYCT0
Bit
Bit
Number
Mnemonic Description
Reserved
7
-
The value read from this bits is always 0. Do not set this bit.
Byte Count
6 - 0
BYCT7:0 Byte count of a received data packet. This Byte count is equal to the number of
data Bytes received after the Data PID.
Reset Value = 0000 0000b
Table 133. UFNUML Register
UFNUML (S:BAh, Read-only) – USB Frame Number Low Register
7
6
5
4
3
2
1
0
FNUM7
FNUM6
FNUM5
FNUM4
FNUM3
FNUM2
FNUM1
FNUM0
Bit
Bit
Number
Mnemonic Description
Frame Number
Lower 8 bits of the 11-bit Frame Number.
7 - 0
FNUM7:0
Reset Value = 00h
130
AT8xC51SND2C
4341D–MP3–04/05
ATMEL [ ATMEL ]
