Name: Renesas RL78 Series
Brand: Renesas
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RL78/F13, F14 CHAPTER 5 CLOCK GENERATOR

R01UH0368EJ0210 Rev.2.10 400

Dec 10, 2015

5.5 Clock Generator Operation

The clock generator generates the following clocks and controls the operation modes of the CPU, such as standby mode

(see Figure 5-1).

 Main system clock fMAIN

 High-speed system clock f

X1 clock fX

External main system clock f

 High-speed on-chip oscillator clock f

 Subsystem clock fSUB

 XT1 clock fXT

 External subsystem clock f

EXS

 PLL clock f

PLL

 Low-speed on-chip oscillator clock f

 CPU/peripheral hardware clock f

CLK

Caution The subsystem clock is only in products with at least 48 pins.

The CPU starts operation when the high-speed on-chip oscillator starts outputting after a reset release in the RL78/F13

and RL78/F14.

When the power supply voltage is turned on, the clock generator operation is shown in Figure 5-26.

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