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Section 13 Serial Communication Interface
Bit 1—Multiprocessor Bit (MPB): Stores the value of the multiprocessor bit in receive data
when a multiprocessor format is used in asynchronous mode. MPB is a read-only bit and cannot
be written.
Bit 1: MPB
Description
Multiprocessor bit value in receive data is 0 *
0
1
Multiprocessor bit value in receive data is 1
Note: * If the RE bit is cleared to 0 when a multiprocessor format is selected, MPB retains its
previous value.
Bit 0—Multiprocessor Bit Transfer (MPBT): Stores the value of the multiprocessor bit added to
transmit data when a multiprocessor format is selected for transmitting in asynchronous mode. The
MPBT setting is ignored in synchronous mode, when a multiprocessor format is not selected, or
when the SCI is not transmitting.
Bit 0: MPBT
Description
0
Multiprocessor bit value in transmit data is 0
1
Multiprocessor bit value in transmit data is 1
13.2.8
Bit Rate Register (BRR)
BRR is an 8-bit register that, together with the CKS1 and CKS0 bits in SMR that select the baud
rate generator clock source, determines the serial communication bit rate.
Bit
7
Initial value
1
Read/Write
R/W
The CPU can always read and write BRR. BRR is initialized to H'FF by a reset and in standby
mode. The two SCI channels have independent baud rate generator control, so different values can
be set in the two channels.
Table 13.3 shows examples of BRR settings in asynchronous mode. Table 13.4 shows examples of
BRR settings in synchronous mode.
Rev. 3.00 Mar 21, 2006 page 452 of 814
REJ09B0302-0300
6
5
4
1
1
1
R/W
R/W
R/W
3
2
1
1
R/W
R/W
R/W
(Initial value)
(Initial value)
1
0
1
1
R/W
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