Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  5   CLOCK  GENERATOR 

R01UH0305EJ0200  Rev.2.00 

 

 

163  

Jul 04, 2013 

 

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.