NEC PD78058FY(A) - Manual (Page 160)

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CHAPTER 7 CLOCK GENERATOR
Figure 7-5. Main System Clock Waveform due to Writing to OSMS
Caution 2. When writing “1” to MCS, V DD must be 2.7 V or higher before the write execution.
Remarks f
xx
: Main system clock frequency (fx or fx/2)
f x : Main system clock oscillation frequency
Write to OSMS
(MCS 0)
f
XX
Max. 2/f
X
Operating at f XX = f X /2 (MCS = 0) Operating at f XX = f X /2 (MCS = 0)