Fujitsu 8FX Hardware Manual page 42

CHAPTER 3 CLOCK CONTROLLER
3.1 Overview
■ Clock Modes
There are five clock modes:
• Main clock mode
• Main CR clock mode
• Main CR PLL clock mode
• Subclock mode
• Sub-CR clock mode.
Table 3.1-1 shows the relationships between the clock modes and the machine clock (operating
clock for the CPU and peripheral functions).
Table 3.1-1 Clock Modes and Machine Clock Selection
Clock mode
Main clock mode
Main CR clock mode
Main CR PLL clock mode
Subclock mode
Sub-CR clock mode
In any clock mode, the frequency of a selected clock can be divided.
20
The machine clock is generated by dividing the main clock by two.
The machine clock is generated from the main CR clock.
The machine clock is generated by multiplying the main CR clock by a PLL
multiplication rate.
The machine clock is generated by dividing the subclock by two.
The machine clock is generated by dividing the sub-CR clock by two.
FUJITSU SEMICONDUCTOR LIMITED
MB95630H Series
Machine clock
MN702-00009-2v0-E