Renesas H8SX/1650 Hardware Manual page 502

Section 13 Serial Communication Interface (SCI)
Bit Bit Name
2 ACS2
1 ACS1
0 ACS0
Rev.2.00 Jun. 28, 2007 Page 480 of 666
REJ09B0311-0200
Initial
Value R/W Description
0 R/W Asynchronous Mode Clock Source Select (valid when
CKE1 = 1 in asynchronous mode)
0 R/W
These bits select the clock source for the average
0 R/W
transfer rate function. When the average transfer rate
function is enabled, the basic clock is automatically
specified regardless of the ABCS bit value.
000: External clock input
001: 115.152 kbps of average transfer rate specific to
010: 460.606 kbps of average transfer rate specific to
011: 720 kbps of average transfer rate specific to Pφ =
100: Setting prohibited
101: 115.196 kbps of average transfer rate specific to
110: 460.784 kbps of average transfer rate specific to
111: 720 kbps of average transfer rate specific to Pφ =
The average transfer rate only supports operating
frequencies of 10.667 MHz, 16 MHz, and 32 MHz.
Pφ = 10.667 MHz is selected (operated using the
basic clock with a frequency 16 times the transfer
rate)
Pφ = 10.667 MHz is selected (operated using the
basic clock with a frequency 8 times the transfer
rate)
32 MHz is selected (operated using the basic clock
with a frequency 16 times the transfer rate)
Pφ = 16 MHz is selected (operated using the basic
clock with a frequency 16 times the transfer rate)
Pφ = 16 MHz is selected (operated using the basic
clock with a frequency 16 times the transfer rate)
16 MHz is selected (operated using the basic clock
with a frequency 8 times the transfer rate)