AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 147

• 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

4338F–USB–08/07
Table 105. UFNUMH Register
UFNUMH (S:BBh, read-only)
USB Frame Number High Register
Reset Value = 00h
Table 106. UFNUML Register
UFNUML (S:BAh, read-only)
USB Frame Number Low Register
Reset Value = 00h
Bit Number
Number
FNUM7
Bit
2-0
7 - 0
5
4
3
7
7
-
Mnemonic
FNUM[10:8]
Mnemonic Description
CRCERR
FNUM[7:0]
CRCOK
FNUM6
Bit
Bit
-
6
6
-
Description
Frame Number CRC OK
This bit is set by hardware when a new Frame Number in Start of Frame Packet
is received without CRC error.
This bit is updated after every Start of Frame packet receipt.
Important note: the Start of Frame interrupt is generated just after the PID receipt.
Frame Number CRC Error
This bit is set by hardware when a corrupted Frame Number in Start of Frame
packet is received.
This bit is updated after every Start of Frame packet receipt.
Important note: the Start of Frame interrupt is generated just after the PID receipt.
Reserved
The value read from this bit is always 0. Do not set this bit.
Frame Number
FNUM[10:8] are the upper 3 bits of the 11-bit Frame Number (see the “UFNUML
Register UFNUML (S:BAh, read-only) USB Frame Number Low Register” on
page 147). It is provided in the last received SOF packet (see SOFINT in the
“USBIEN Register USBIEN (S:BEh) USB Global Interrupt Enable Register” on
page 138). FNUM is updated if a corrupted SOF is received.
Frame Number
FNUM[7:0] are the lower 8 bits of the 11-bit Frame Number (See “UFNUMH
Register UFNUMH (S:BBh, read-only) USB Frame Number High Register” on
page 147.).
CRCOK
FNUM5
5
5
CRCERR
FNUM4
4
4
FNUM3
3
3
-
FNUM10
FNUM2
2
2
FNUM9
FNUM1
1
1
FNUM8
FNUM0
0
0
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