Rev. 1.0, 09/02, page 295 of 568
14.3.5
Serial Mode Register (SMR)
SMR is used to set the SCI’s serial transfer format and select the baud rate generator clock source.
Some bit functions of SMR differ between normal serial communication interface mode and Smart
Card interface mode.
•
Normal Serial Communication Interface Mode (When SMIF in SCMR is 0)
Bit
Bit Name
Initial Value
R/W
Description
7 C/
A
0
R/W
Communication
Mode
0: Asynchronous mode
1: Clocked synchronous mode
6
CHR
0
R/W
Character Length (enabled only in asynchronous
mode)
0: Selects 8 bits as the data length.
1: Selects 7 bits as the data length. LSB-first is
fixed and the MSB of TDR is not transmitted in
transmission.
In clocked synchronous mode, a fixed data length
of 8 bits is used.
5
PE
0
R/W
Parity Enable (enabled only in asynchronous
mode)
When this bit is set to 1, the parity bit is added to
transmit data before transmission, and the parity
bit is checked in reception. For a multiprocessor
format, parity bit addition and checking are not
performed regardless of the PE bit setting.
4 O/
E
0
R/W
Parity Mode (enabled only when the PE bit is 1 in
asynchronous mode)
0: Selects even parity.
1: Selects odd parity.
3
STOP
0
R/W
Stop Bit Length (enabled only in asynchronous
mode)
Selects the stop bit length in transmission.
0: 1 stop bit
1: 2 stop bits
In reception, only the first stop bit is checked. If
the second stop bit is 0, it is treated as the start bit
of the next transmit character.
Summary of Contents for H8S/2627
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