Datasheet

Table Of Contents
Section 13 Serial Communication Interface
REJ09B0140-0900 Rev. 9.00 Page 403 of 846
Sep 16, 2010
H8S/2215 Group
13.3.9 Serial Extended Mode Register (SEMR) (Only for Channel 0 in H8S/2215)
SEMR extends the functions of SCI_0. SEMR0 enables selection of the SCI_0 select function in
synchronous mode, base clock setting in asynchronous mode, and also clock source selection and
automatic transfer rate setting. Figure 13.3 shows an example of the internal base clock when an
average transfer rate is selected and figure 13.4 shows as example of the setting when the TPU
clock input is selected.
Bit Bit Name Initial Value R/W Description
7 SSE 0 R/W SCI_0 Select Enable
Allows selection of the SCI0 select function when an
external clock is input in synchronous mode.
The SSE setting is valid when external clock input is used
(CKE1 = 1 in SCR) in synchronous mode (C/A = 1 in SMR).
0: SCI_0 select function disabled
1: SCI_0 select function enabled
When the SCI_0 select function is enabled, if 1 is input to
the PG1/IRQ7 pin, TxD0 output goes to the high-impedance
state, SCK0 input is fixed high.
6 to 4 Undefined Reserved
The write value should always be 0.
3 ABCS 0 R/W Asynchronous Base Clock Select
Selects the 1-bit-interval base clock in asynchronous mode.
The ABCS setting is valid in asynchronous mode (C/A = 0
in SMR).
0: SCI_0 operates on base clock with frequency of 16 times
transfer rate
1: SCI_0 operates on base clock with frequency of 8 times
transfer rate