Rev. 3.0, 10/02, page 371 of 686
13.3.9
Serial Extended Mode Register 0 (SEMR_0)
SEMR_0 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.
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
These bits must always be written to 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
Summary of Contents for H8S/2215 Series
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