Renesas H8S/2368 Series Hardware Manual page 591

Bit Bit Name
2 ACS2
1 ACS1
0 ACS0
Initial Value R/W
0 R/W
0 R/W
0 R/W
Description
Asynchronous clock source selection (valid when
CKS1 = 1 in asynchronous mode)
Selects the clock source for the average transfer
rate.
The basic clock can be automatically set by
selecting the average transfer rate in spite of the
value of ABCS.
000: External clock input
001: Selects 115.152 kbps which is the average
transfer rate dedicated for φ= 10.667 MHz.
(Operates on a basic clock with a frequency
of 16 times the transfer rate.)
010: Selects 460.606 kbps which is the average
transfer rate dedicated for φ= 10.667 MHz.
(Operates on a basic clock with a frequency
of 8 times the transfer rate.)
011: Selects 720 kbps which is the average
transfer rate dedicated for φ = 32 MHz.
(Operates on a basic clock with a frequency
of 16 times the transfer rate.)
100: Reserved
101: Selects 115.196 kbps which is the average
transfer rate dedicated for φ = 16 MHz
(Operates on a basic clock with a frequency
of 16 times the transfer rate.)
110: Selects 460.784 kbps which is the average
transfer rate dedicated for φ = 16 MHz
(Operates on a basic clock with a frequency
of 16 times the transfer rate.)
111: Selects 720 kbps which is the average
transfer rate dedicated for φ = 16 MHz
(Operates on a basic clock with a frequency
of 8 times the transfer rate.)
Note that the average transfer rate does not
correspond to the frequency other than 10.667,
16, or 32 MHz.
Rev. 2.00, 05/03, page 539 of 820