at83c5122 ATMEL Corporation, at83c5122 Datasheet - Page 122
at83c5122
Manufacturer Part Number
at83c5122
Description
At83c5123 C51 Microcontroller With Usb And Smart Card Reader Interfaces
Manufacturer
ATMEL Corporation
Datasheet
1.AT83C5122.pdf
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122
AT8xC5122/23
Table 71. USB FIFO Data Endpoint X (X=EPNUM set in UEPNUM Register) -
UEPDATX (S:CFh)
Reset Value = XXXX XXXXb
Table 72. USB Byte Count Register X (X=EPNUM set in UEPNUM Register) - UBYCTX
(S:E2h)
Reset Value = 0000 0000b
Number
Number
FDAT7
6 - 0
Bit
7 - 0
Bit
7
7
7
-
Mnemonic Description
BYCT[6:0]
Mnemonic
FDAT
Bit
BYCT6
FDAT6
-
Bit
6
6
[7:0]
Reserved
The value read from these bits is always 0. Do not change this bit.
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.
Description
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).
FDAT5
BYCT5
5
5
BYCT4
FDAT4
4
4
BYCT3
FDAT3
3
3
FDAT2
BYCT2
2
2
BYCT1
FDAT1
1
1
4202E–SCR–06/06
BYCT0
FDAT0
0
0
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