Datasheet

Section 15 Serial Communication Interface (SCI, IrDA)
Rev. 3.00 Mar 17, 2006 page 689 of 926
REJ09B0283-0300
15.3.11 Serial Extension Mode Register (SEMR)
SEMR selects the clock source in asynchronous mode. The basic clock can be automatically set by
selecting the average transfer rate. SEMR is supported only in SCI_2 of the H8S/2678R Group.
Bit Bit Name Initial Value R/W Description
7
to
4
— Undefined — Reserved
If these bits are read, an undefined value will be
returned and cannot be modified.
3 ABCS 0 R/W Asynchronous basic clock selection (valid only in
asynchronous mode)
Selects the basic clock for 1-bit period in
asynchronous mode.
0: Operates on a basic clock with a frequency of
16 times the transfer rate.
1: Operates on a basic clock with a frequency of
8 times the transfer rate.