Renesas H8S/2158, User Manual

Page: 468 / 929

Section 16 Serial Communication Interface (SCI, IrDA, and CRC)
Rev. 3.00 Jan 25, 2006 page 414 of 872
REJ09B0286-0300
Bit Bit Name Initial Value R/W Description
3
2
1
0 ACS4
ACS2
ACS1
ACS0 0
0
0
0 R/W
R/W
R/W
R/W Asynchronous Mode Clock Source Select
These bits specify the clock source and the average
transfer rate in asynchronous mode.
These bits are valid only when external clock is
supplied in asynchronous mode.
0000: Normal operation with external clock input and
average transfer rate operation not used
(operated using the basic clock with a
frequency 16 or 8 times the transfer clock
frequency)
0001: Average transfer rate operation at 115.152
kbps when the system clock frequency is
10.667 MHz (operated using the basic clock
with a frequency 16 times the transfer clock
frequency)
0010: Average transfer rate operation at 460.606
kbps when the system clock frequency is
10.667 MHz (operated using the basic clock
with a frequency 8 times the transfer clock
frequency)
0011: Reserved
0100: Reserved
0101: Average transfer rate operation at 115.196
kbps when the system clock frequency is 16
MHz (operated using the basic clock with a
frequency 16 times the transfer clock
frequency)
0110: Average transfer rate operation at 460.784
kbps when the system clock frequency is 16
MHz (operated using the basic clock with a
frequency 16 times the transfer clock
frequency)
0111: Average transfer rate operation at 720 kbps
when the system clock frequency is 16 MHz
(operated using the basic clock with a
frequency 8 times the transfer clock
frequency)