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ST92F124 Datasheet(PDF) 244 Page - STMicroelectronics

No. de pieza ST92F124
Descripción Electrónicos  8/16-BIT SINGLE VOLTAGE FLASH MCU FAMILY WITH RAM, E3 TM(EMULATED EEPROM), CAN 2.0B AND J1850 BLPD
PDF  429 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92F124 Datasheet(HTML) 244 Page - STMicroelectronics

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ASYNCHRONOUS SERIAL COMMUNICATIONS INTERFACE (SCI-A)
ASYNCHRONOUS SERIAL COMMUNICATIONS INTERFACE (Cont’d)
10.6.4.7 Parity definition
Even parity: The parity bit is calculated to obtain
an even number of “1s” inside the frame made of
the 7 or 8 LSB bits (depending on whether M is
equal to 0 or 1) and the parity bit.
Ex: data=00110101; 4 bits set => parity bit will be
0 if even parity is selected (PS bit = 0).
Odd parity: The parity bit is calculated to obtain
an odd number of “1s” inside the frame made of
the 7 or 8 LSB bits (depending on whether M is
equal to 0 or 1) and the parity bit.
Ex: data=00110101; 4 bits set => parity bit will be
1 if odd parity is selected (PS bit = 1).
Transmission mode: If the PCE bit is set then the
MSB bit of the data written in the data register is
not transmitted but is changed by the parity bit.
Reception mode: If the PCE bit is set then the in-
terface checks if the received data byte has an
even number of “1s” if even parity is selected
(PS=0) or an odd number of “1s” if odd parity is se-
lected (PS=1). If the parity check fails, the PE flag
is set in the SCISR register and an interrupt is gen-
erated if PCIE is set in the SCICR1 register.
9



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