Datasheet

RL78/L12 CHAPTER 5 CLOCK GENERATOR
R01UH0330EJ0200 Rev.2.00 153
Dec 13, 2013
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 f
MAIN
• High-speed system clock f
MX
X1 clock fX
External main system clock f
EX
• High-speed on-chip oscillator f
IH
• Subsystem clock fSUB
• XT1 clock fXT
• External subsystem clock f
EXS
• Low-speed on-chip oscillator clock fIL
• CPU/peripheral hardware clock f
CLK
The CPU starts operation when the high-speed on-chip oscillator starts outputting after a reset release in the RL78/L12.
When the power supply voltage is turned on, the clock generator operation is shown in Figure 5-14.