HD6432670 Hitachi, HD6432670 Datasheet - Page 705

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

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 Series.
Bit
7
to
4
3
Bit Name
—
ABCS
Initial Value
Undefined
0
R/W
—
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
1: Operates on a basic clock with a frequency of 8
16 times the transfer rate.
times the transfer rate.
Rev. 2.0, 04/02, page 659 of 906