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Chapter 15
Asynchronous Serial Interface C (UARTC)
User’s Manual U16580EE3V1UD00
15.5.9 Parity types and operations
Caution:
When using the LIN function, fix the UCnPS1 and UCnPS0 bits of the UCnCTL0
register to 00.
The parity bit is used to detect bit errors in the communication data. Normally the same parity is used
on the transmission side and the reception side.
In the case of even parity and odd parity, it is possible to detect “1” bit errors (odd count). In the case of
0 parity and no parity, errors cannot be detected.
(1)
Even parity
(a) During transmission
The number of bits whose value is “1” among the transmit data, including the parity bit, is
controlled so as to be an even number. The parity bit values are as follows.
•
Odd number of bits whose value is “1” among transmit data:
1
•
Even number of bits whose value is “1” among transmit data:
0
(b) During reception
The number of bits whose value is “1” among the reception data, including the parity bit, is
counted, and if it is an odd number, a parity error is output.
(2)
Odd parity
(a) During transmission
Opposite to even parity, the number of bits whose value is “1” among the transmit data, including
the parity bit, is controlled so that it is an odd number. The parity bit values are as follows.
•
Odd number of bits whose value is “1” among transmit data:
0
•
Even number of bits whose value is “1” among transmit data: 1
(b) During reception
The number of bits whose value is “1” among the receive data, including the parity bit, is counted,
and if it is an even number, a parity error is output.
(3)
0 parity
During transmission, the parity bit is always made 0, regardless of the transmit data.
During reception, parity bit check is not performed. Therefore, no parity error is generated,
regardless of whether the parity bit is 0 or 1.
(4)
No parity
No parity bit is added to the transmit data.
Reception is performed assuming that there is no parity bit. No parity error occurs since there is
no parity bit.
Содержание MuPD70F3187
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