HD64F2168 Datasheet, PDF (417/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Bit Bit Name Initial Value R/W Description
4
ACS4
0
2
ACS2
0
1
ACS1
0
0
ACS0
0
R/W Asynchronous Mode Clock Source Select
R/W _{Specify the clock source and the average transfer rate}
R/W _{in asynchronous mode. These bits are valid only when}
R/W _{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: Average transfer rate operation at 720 kbps when
the system clock frequency is 32 MHz (operated
using the basic clock with a frequency 16 times
the transfer clock frequency)
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)
1000: 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)
1001: Average transfer rate operation at 230.392 kbps
when the system clock frequency is 16 MHz
(operated using the basic clock with a frequency
16 times the transfer clock frequency)
Rev. 3.00, 03/04, page 377 of 830