Rainbow Electronics AT89C5122 User Manual
Page 122
122
AT8xC5122/23
4202E–SCR–06/06
Reset Value = XXXX XXXXb
Reset Value = 0000 0000b
Table 71. USB FIFO Data Endpoint X (X=EPNUM set in UEPNUM Register) -
UEPDATX (S:CFh)
7
6
5
4
3
2
1
0
FDAT7
FDAT6
FDAT5
FDAT4
FDAT3
FDAT2
FDAT1
FDAT0
Bit
Number
Bit
Mnemonic
Description
7 - 0
FDAT
[7:0]
Endpoint X FIFO data
Data byte to be written to FIFO or data byte to be read from the FIFO, for the
Endpoint X (see EPNUM).
Table 72. USB Byte Count Register X (X=EPNUM set in UEPNUM Register) - UBYCTX
(S:E2h)
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 these bits is always 0. Do not change this bit.
6 - 0
BYCT[6:0]
Byte Count LSB
Least Significant Byte of the byte count of a received data packet. This byte count
is equal to the number of data bytes received after the Data PID.