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Chapter 15
Serial Interface Channel UART
User’s Manual U16504EE1V1UD00
(b) Parity types and operations
The parity bit is used to detect bit errors in transfer data. Usually, the same type of parity bit is
used by the transmitting and receiving sides. When odd parity or even parity is set, errors in the
parity bit (the odd-number bit) can be detected. When zero parity or no parity is set, errors are not
detected.
Even parity
During transmission
The number of bits in transmit data that includes a parity bit is controlled so that there are an
even number of “1” bits. The value of the parity bit is as follows.
If the transmit data contains an odd number of “1” bits: the parity bit value is “1”.
If the transmit data contains an even number of “1” bits: the parity bit value is “0”
During reception
The number of “1” bits is counted among the transfer data that include a parity bit, and a parity
error occurs when the result is an odd number.
Odd parity
During transmission
The number of bits in transmit data that includes a parity bit is controlled so that there is an odd
number of “1” bits. The value of the parity bit is as follows.
If the transmit data contains an odd number of “1” bits: the parity bit value is “0”
If the transmit data contains an even number of “1” bits: the parity bit value is “1”
During reception
The number of “1” bits is counted among the transfer data that include a parity bit, and a parity
error occurs when the result is an even number.
Zero parity
During transmission, the parity bit is set to “0” regardless of the transmit data.
During reception, the parity bit is not checked. Therefore, no parity errors will occur regardless of
whether the parity bit is a “0” or a “1”.
No parity
No parity bit is added to the transmit data.
During reception, receive data is regarded as having no parity bit. Since there is no parity bit, no
parity errors will occur.