Serial Extended Mode Register (Semr) - Renesas H8SX/1650 Hardware Manual

13.3.10 Serial Extended Mode Register (SEMR)

SEMR selects the clock source in asynchronous mode. The basic clock is automatically specified
when the average transfer rate operation is selected.
Bit 7

Bit Name
Initial Value 0
R/W R/W
Bit Bit Name

7

6 to 4
3 ABCS
6 5
 
0 0
R R
Initial
Value R/W Description
0 R/W Reserved
This bit is always read as 0. The write value should
always be 0.
All 0 R Reserved
These are read-only bits and cannot be modified.
0 R/W Asynchronous Mode Basic Clock Select (valid only in
asynchronous mode)
Selects the basic clock for a 1-bit period.
0: The basic clock has a frequency 16 times the transfer
1: The basic clock has a frequency 8 times the transfer
Section 13 Serial Communication Interface (SCI)
4 3

ABCS
0 0
R R/W
rate
rate
Rev.2.00 Jun. 28, 2007 Page 479 of 666
2 1
ACS2 ACS1
0 0
R/W R/W
REJ09B0311-0200
0
ACS0
0
R/W