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ATmega128 датащи(PDF) 192 Page - ATMEL Corporation

номер детали ATmega128
подробное описание детали  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
PDF  386 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega128 датащи(HTML) 192 Page - ATMEL Corporation

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2467S–AVR–07/09
ATmega128
• 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).
USART Baud Rate
Registers – UBRRnL
and UBRRnH
UBRRnH is not available in mega103 compatibility mode
Table 79. USBSn Bit Settings
USBSn
Stop Bit(s)
01-bit
12-bits
Table 80. 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 81. 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
151413121110
9
8
–
–
–
–
UBRRn[11:8]
UBRRnH
UBRRn[7:0]
UBRRnL
765
4321
0
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
0000
0
000
0000
0



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