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ATmega64A bảng dữ liệu(PDF) 200 Page - ATMEL Corporation

tên linh kiện ATmega64A
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
PDF  392 Pages
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Trang chủ  http://www.atmel.com
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ATmega64A bảng dữ liệu(HTML) 200 Page - ATMEL Corporation

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200
8160C–AVR–07/09
ATmega64A
20.11.5
UBRRnL and UBRRnH – USART Baud Rate Registers
(1)
Note:
1. UBRRH is not available in mega103 compatibility mode
• 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 UBRRH is written.
• Bit 11:0 – UBRRn11:0: USART Baud Rate Register
This is a 12-bit register which contains the USART baud rate. The UBRRnH contains the four
most significant bits, and the UBRRnL 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 UBRRnL will trigger an immediate update of the baud rate prescaler.
Bit
151413
12
1110
9
8
––––
UBRRn[11:8]
UBRRnH
UBRRn[7:0]
UBRRnL
7654
3210
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
0000
0000
0000



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