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AT90USB646 Datasheet(PDF) 202 Page - ATMEL Corporation

Part # AT90USB646
Description  8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  459 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 202 Page - ATMEL Corporation

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202
7593H–AVR–11/08
ATmega32U6/AT90USB64/128
• 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.
• 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.
• 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).
18.9.5
USART Baud Rate Registers – UBRRLn and UBRRHn
• Bit 15:12 – Reserved Bits
Table 18-6.
USBS Bit Settings
USBSn
Stop Bit(s)
01-bit
12-bit
Table 18-7.
UCSZn Bits Settings
UCSZn2
UCSZn1
UCSZn0
Character Size
000
5-bit
001
6-bit
010
7-bit
011
8-bit
100
Reserved
101
Reserved
110
Reserved
111
9-bit
Table 18-8.
UCPOLn Bit Settings
UCPOLn
Transmitted Data Changed (Output
of TxDn Pin)
Received Data Sampled (Input on
RxDn Pin)
0
Rising XCKn Edge
Falling XCKn Edge
1
Falling XCKn Edge
Rising XCKn Edge
Bit
15
14131211
10
9
8
–
–
–
–
UBRR[11:8]
UBRRHn
UBRR[7:0]
UBRRLn
765
43
210
Read/Write
R
R
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
000
00
000
000
00
000



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