Serial Extension Mode Register (Semr) - Hitachi H8S/2378, H8S/2378R Series Hardware Manual

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.
Bit Bit Name
7 —
to
4
3 ABCS
Rev. 1.0, 09/01, page 656 of 904
Initial Value R/W
Undefined —
0 R/W
Description
Reserved
If these bits are read, an undefined value will be
returned and cannot be modified.
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.