at89c5131 ATMEL Corporation, at89c5131 Datasheet - Page 142

• Manufacturer Part Number: at89c5131
• Description: 8-bit Flash Microcontroller With Full Speed Usb Device At89c5131
• Manufacturer: ATMEL Corporation

140
AT89C5131
Table 97. UEPDATX Register
UEPDATX (S:CFh)
USB FIFO Data Endpoint X (X = EPNUM set in UEPNUM Register UEPNUM (S:C7h)
USB Endpoint Number)
Reset Value = XXh
Table 98. UBYCTLX Register
UBYCTLX (S:E2h)
USB Byte Count Low Register X (X = EPNUM set in UEPNUM Register UEPNUM
(S:C7h) USB Endpoint Number)
Reset Value = 00h
Bit Number
Bit Number
BYCT7
FDAT7
7 - 0
7 - 0
7
7
Mnemonic Description
Mnemonic Description
FDAT
BYCT[7:0]
FDAT6
BYCT6
Bit
Bit
6
6
[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).
Byte Count LSB
Least Significant Byte of the byte count of a received data packet. The most
significant part is provided by the UBYCTHX Register UBYCTHX (S:E3h) USB
Byte Count High Register X (X = EPNUM set in UEPNUM Register UEPNUM
(S:C7h) USB Endpoint Number) (see Figure 98 on page 140). This byte count is
equal to the number of data bytes received after the Data PID.
BYCT5
FDAT5
5
5
BYCT4
FDAT4
4
4
BYCT3
FDAT3
3
3
BYCT2
FDAT2
2
2
BYCT1
FDAT1
1
1
4136C–USB–04/05
BYCT0
FDAT0
0
0