RL78/G1H CHAPTER 6 CLOCK GENERATOR
R01UH0575EJ0120 Rev. 1.20 Page 122 of 920
Dec 22, 2016
6.5 Clock Generator Operation
The clock generator generates the following clocks and controls the operation modes of the CPU, such as standby
mode (see Figure 6 - 1).
• Main system clock f
MAIN
• High-speed system clock fMX
X1 clock fX
External main system clock fEX
• High-speed on-chip oscillator clock fIH
• Subsystem clock fSUB
•XT1 clock fXT
• External subsystem clock fEXS
• Low-speed on-chip oscillator clock fIL
• CPU/peripheral hardware clock fCLK
The CPU starts operation when the high-speed on-chip oscillator starts outputting after a reset release in the
RL78/G1H.
When the power supply voltage is turned on, the clock generator operation is shown in Figure 6 - 18.
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