Renesas rl78 Manual De Usuario
RL78/G1A
CHAPTER 5 CLOCK GENERATOR
R01UH0305EJ0200 Rev.2.00
163
Jul 04, 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 f
X
External main system clock f
EX
• High-speed on-chip oscillator clock f
IH
• Subsystem clock f
SUB
• XT1 clock f
XT
• External subsystem clock f
EXS
• Low-speed on-chip oscillator clock f
IL
• 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/G1A.
When the power supply voltage is turned on, the clock generator operation is shown in Figure 5-14.