BAT32G1x9 user manual | Chapter 4 Clock generation circuit
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Rev.1.02
4.5 Clock generation circuit operation
The clock generation circuit generates the various clocks shown below and controls the operating mode
of the CPU such as standby mode (see Figure Figure 4-1).
The main system clock
f
MAIN
• High speed system clock fMX
X1 clock
fX
External master system clock fEX
• High speed internal oscillator clock
f
IH
Subsystem clock
f
SUB
•
XT1 clock
f
XT
• External subsystem clock f
EXS
Low speed internal oscillator clock f
IL
CPU/peripheral hardware clock
f
CLK
After the BAT32G179 reset is released, the CPU starts operating through the output of the high-speed
internal oscillator. The operation of the clock generation circuit when the power is turned on is shown in
Figure Figure 4-21.