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CHAPTER 3 CPU
G
Machine clock
This clock is an operating clock for the CPU and the resources. One cycle of the machine clock is a
machine cycle (1/φ). One clock can be selected from the main clock sub clock, and four types of PLL
clock.
Notes:
• When the operating voltage is 5V, the oscillation clock can oscillate at 3 to 16 MHz. The maximum
operating frequency of the CPU and peripheral resources is 16 MHz. If a multiplier that exceeds the
maximum operating frequency is set, the device does not operate normally. When the oscillation
clock frequency is 16 MHz, therefore, the PLL clock multiplier can be set only to 1. The PLL
oscillator oscillates in the range of 3 to 16 MHz, which varies depending on the operating voltage and
multiplier.
• There is no sub-clock in MB90F897S.
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