Hardware manual
Rev. 3.0, 09/98, page 192 of 361
Bit 6Character Length (CHR): This bit selects the character length in asynchronous mode. It
is ignored in synchronous mode.
Bit 6
CHR Description
0 8 bits per character. (Initial value)
1 7 bits per character. (Bits 0 to 6 of TDR and RDR are used for transmitting and
receiving, respectively.)
Bit 5Parity Enable (PE): This bit selects whether to add a parity bit in asynchronous mode. It
is ignored in synchronous mode, and when a multiprocessor format is used.
Bit 5
PE Description
0 Transmit: No parity bit is added. (Initial value)
Receive: Parity is not checked.
1 Transmit: A parity bit is added.
Receive: Parity is checked.
Bit 4Parity Mode (O/E ): In asynchronous mode, when parity is enabled (PE = “1”), this bit
selects even or odd parity.
Even parity means that a parity bit is added to the data bits for each character to make the total
number of 1’s even. Odd parity means that the total number of 1’s is made odd.
This bit is ignored when PE = “0,” or when a multiprocessor format is used. It is also ignored in
the synchronous mode.
Bit 4
O/E Description
0 Even parity. (Initial value)
1 Odd parity.