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ATmega169P bảng dữ liệu(PDF) 194 Page - ATMEL Corporation

tên linh kiện ATmega169P
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  393 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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ATmega169P bảng dữ liệu(HTML) 194 Page - ATMEL Corporation

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194
8018N–AVR–08/09
ATmega169P
19.10.5
UBRRLn and UBRRHn – USART Baud Rate Registers
• Bit 15:12 – Reserved Bits
These bits are reserved for future use. For compatibility with future devices, these bit must be
written to zero when UBRRHn is written.
• Bit 11:0 – UBRR11:0: USART Baud Rate Register
This is a 12-bit register which contains the USART baud rate. The UBRRHn contains the four
most significant bits, and the UBRRLn contains the eight least significant bits of the USART
baud rate. Ongoing transmissions by the Transmitter and Receiver will be corrupted if the baud
rate is changed. Writing UBRRLn will trigger an immediate update of the baud rate prescaler.
Bit
15
14131211
10
9
8
(0xC5)
––––
UBRRn[11:8]
UBRRHn
(0xC4)
UBRRn[7:0]
UBRRLn
7654
321
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
0000
000
0
0000
000
0



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