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ATmega128 Datasheet(PDF) 193 Page - ATMEL Corporation

Part # ATmega128
Description  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
PDF  386 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega128 Datasheet(HTML) 193 Page - ATMEL Corporation

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2467S–AVR–07/09
ATmega128
• 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 UBRRnH is written.
• Bit 11:0 – UBRRn11:0: USARTn Baud Rate Register
This is a 12-bit register which contains the USARTn baud rate. The UBRRnH contains the four
most significant bits, and the UBRRnL contains the eight least significant bits of the USARTn
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.



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