Table of Contents
Advertisement
MB95630H Series
3.9
Operation of Prescaler
The prescaler generates count clock sources to different peripheral functions.
■ Operation of Prescaler
The prescaler generates count clock sources from a clock whose frequency is generated by
dividing the machine clock(MCLK),or from buffered signals from the time-base timer(F
8
F
/2
CH
peripheral functions. The prescaler keeps operating while the machine clock and the clocks
from the time-base timer are being supplied.
Table 3.9-1, Table 3.9-2 and Table 3.9-3 list the count clock sources generated by the
prescaler.
Table 3.9-1
Count clock source
frequency
Table 3.9-2
Count clock source
frequency
MN702-00009-1v0-E
6
7
, F
/2
, F
/2
, F
CRH
CRH
MCRPLL
Count Clock Sources Generated by Prescaler (F
Frequency
(F
= 20 MHz,
CH
MCLK = 10 MHz)
MCLK/2
MCLK/4
MCLK/8
MCLK/16
MCLK/32
7
F
/2
CH
8
F
/2
CH
Count Clock Sources Generated by Prescaler (F
Frequency
(F
= 4 MHz,
CRH
MCLK= 4 MHz)
MCLK/2
MCLK/4
MCLK/8
MCLK/16
MCLK/32
6
F
/2
CRH
7
F
/2
CRH
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER 3 CLOCK CONTROLLER
6
7
/2
, or F
/2
MCRPLL
Frequency
(F
= 32 MHz,
CH
MCLK = 16 MHz)
5 MHz
2.5 MHz
1.25 MHz
0.625 MHz
0.3125 MHz
156.25 kHz
78.125 kHz
2 MHz
1 MHz
0.5 MHz
0.25 MHz
125 kHz
62.5 kHz
31.25 kHz
3.9 Operation of Prescaler
), and then supplies them to different
)
CH
Frequency
(F
= 32.5 MHz,
CH
MCLK = 16.25 MHz)
8 MHz
8.125 MHz
4 MHz
4.0625 MHz
2 MHz
2.0313 MHz
1 MHz
1.0156 MHz
0.5 MHz
0.5078 MHz
250 kHz
253.9 kHz
125 kHz
126.95 kHz
)
CRH
7
/2
,
CH
57
Advertisement
Table of Contents
