AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 142

• Manufacturer Part Number: AT89C5131A-L
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-L

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 48 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 3.6
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

142
AT89C5131A-L
Table 99. 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 100. 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]
BYCT6
FDAT6
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 100 on page 142). This byte count is
equal to the number of data bytes received after the Data PID.
BYCT5
FDAT5
5
5
FDAT4
BYCT4
4
4
BYCT3
FDAT3
3
3
BYCT2
FDAT2
2
2
BYCT1
FDAT1
1
1
4338F–USB–08/07
BYCT0
FDAT0
0
0