AT90USB647 Atmel Corporation, AT90USB647 Datasheet - Page 202

• Manufacturer Part Number: AT90USB647
• Manufacturer: Atmel Corporation

Specifications of AT90USB647

• Flash (kbytes): 64 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 48
• Ext Interrupts: 16
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device + OTG
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 10
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

18.9.5
202
AT90USB64/128
USART Baud Rate Registers – UBRRLn and UBRRHn
• Bit 3 – USBSn: Stop Bit Select
This bit selects the number of stop bits to be inserted by the Transmitter. The Receiver ignores
this setting.
Table 18-6.
• Bit 2:1 – UCSZn1:0: Character Size
The UCSZn1:0 bits combined with the UCSZn2 bit in UCSRnB sets the number of data bits
(Character SiZe) in a frame the Receiver and Transmitter use.
Table 18-7.
• Bit 0 – UCPOLn: Clock Polarity
This bit is used for synchronous mode only. Write this bit to zero when asynchronous mode is
used. The UCPOLn bit sets the relationship between data output change and data input sample,
and the synchronous clock (XCKn).
Table 18-8.
• Bit 15:12 – Reserved Bits
Bit
Read/Write
Initial Value
UCPOLn
UCSZn2
0
1
0
0
0
0
1
1
1
1
USBSn
15
–
UBRR[7:0]
7
R
R/W
0
0
Transmitted Data Changed (Output
of TxDn Pin)
Rising XCKn Edge
Falling XCKn Edge
USBS Bit Settings
UCSZn Bits Settings
UCPOLn Bit Settings
0
1
14
–
6
R
R/W
0
0
UCSZn1
0
0
1
1
0
0
1
1
13
–
5
R
R/W
0
0
Stop Bit(s)
1-bit
2-bit
12
–
4
R
R/W
0
0
UCSZn0
0
1
0
1
0
1
0
1
11
UBRR[11:8]
3
R/W
R/W
0
0
Received Data Sampled (Input on
RxDn Pin)
Falling XCKn Edge
Rising XCKn Edge
10
2
R/W
R/W
0
0
Character Size
5-bit
6-bit
7-bit
8-bit
Reserved
Reserved
Reserved
9-bit
9
1
R/W
R/W
0
0
8
0
R/W
R/W
0
0
UBRRHn
UBRRLn
7593K–AVR–11/09