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ATmega169P Datasheet(PDF) 181 Page - ATMEL Corporation

Part # ATmega169P
Description  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  393 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega169P Datasheet(HTML) 181 Page - ATMEL Corporation

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181
8018N–AVR–08/09
ATmega169P
19.7.2
Receiving Frames with 9 Data Bits
If 9-bit characters are used (UCSZ=7) the ninth bit must be read from the RXB8n bit in UCSRnB
before reading the low bits from the UDRn. This rule applies to the FEn, DORn and UPEn Sta-
tus Flags as well. Read status from UCSRnA, then data from UDRn. Reading the UDRn I/O
location will change the state of the receive buffer FIFO and consequently the TXB8n, FEn,
DORn and UPEn bits, which all are stored in the FIFO, will change.
The following code example shows a simple USART receive function that handles both nine bit
characters and the status bits.



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