AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 202
AT90USB647-MU
Manufacturer Part Number
AT90USB647-MU
Description
MCU, 8BIT, 64K FLASH, USB, 64QFN
Manufacturer
Atmel
Specifications of AT90USB647-MU
Controller Family/series
AT90
No. Of I/o's
48
Eeprom Memory Size
2KB
Ram Memory Size
4KB
Cpu Speed
16MHz
No. Of
RoHS Compliant
Core Size
8bit
Program Memory Size
64KB
Oscillator Type
External, Internal
Package
64QFN EP
Device Core
AVR
Family Name
AT90
Maximum Speed
20 MHz
Ram Size
4 KB
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Program Memory Type
Flash
Number Of Programmable I/os
48
Interface Type
SPI/TWI/USART/USB
On-chip Adc
8-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
4
Lead Free Status / Rohs Status
Details
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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
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