Renesas H8S/2158 User Manual page 468

Section 16 Serial Communication Interface (SCI, IrDA, and CRC)
Bit Bit Name Initial Value
3 ACS4 0
2 ACS2 0
1 ACS1 0
0 ACS0 0
Rev. 3.00 Jan 25, 2006 page 414 of 872
REJ09B0286-0300
R/W Description
R/W Asynchronous Mode Clock Source Select
R/W
These bits specify the clock source and the average
R/W
transfer rate in asynchronous mode.
R/W
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)