AT89C5122 ATMEL [ATMEL Corporation], AT89C5122 Datasheet - Page 122

• Manufacturer Part Number: AT89C5122
• Description: MICROCONTROLLER WITH USB AND SMART CARD READER INTERFACES
• Manufacturer: ATMEL [ATMEL Corporation]

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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).
BYCT5
FDAT5
5
5
BYCT4
FDAT4
4
4
BYCT3
FDAT3
3
3
BYCT2
FDAT2
2
2
BYCT1
FDAT1
1
1
4202D–SCR–06/05
BYCT0
FDAT0
0
0