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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATMEGA16 датащи(PDF) 142 Page - ATMEL Corporation |
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ATMEGA16 датащи(HTML) 142 Page - ATMEL Corporation |
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142 / 315 page  142 ATmega16(L) 2466E–AVR–10/02 The USART Character SiZe (UCSZ2:0) bits select the number of data bits in the frame. The USART Parity mode (UPM1:0) bits enable and set the type of parity bit. The selec- tion between one or two stop bits is done by the USART Stop Bit Select (USBS) bit. The receiver ignores the second stop bit. An FE (Frame Error) will therefore only be detected in the cases where the first stop bit is zero. Parity Bit Calculation The parity bit is calculated by doing an exclusive-or of all the data bits. If odd parity is used, the result of the exclusive or is inverted. The relation between the parity bit and data bits is as follows:: P even Parity bit using even parity P odd Parity bit using odd parity d n Data bit n of the character If used, the parity bit is located between the last data bit and first stop bit of a serial frame. P even d n 1 – … d 3 d 2 d 1 d 0 0 P odd ⊕⊕⊕ ⊕⊕ ⊕ d n 1 – … d 3 d 2 d 1 d 0 1 ⊕⊕⊕ ⊕⊕ ⊕ = = |
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