
256
μPD780948, μPD78F0948, μPD780949, μPD78F0949
(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.
(i) 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.
(ii) 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.
(iii)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”.
(iv)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.