CMS32L051 User Manual |Chapter 4 Clock Generation Circuit
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4.5 Operation of clock generation circuit
The clock generation circuit generates the various clocks shown below and controls the operating mode
of the CPU such as standby mode (refer to Figure 4-1).
The master system clock f
MAIN
High-speed system clock f
MX
X1 clock f
X
External master system clock f
EX
High speed internal oscillator clock f
ICH
The 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 CMS32L051 is released, the CPU starts operating through the output of a high-speed internal
oscillator. The operation of the clock generation circuit when the power is turned on is shown in Figure 4-16.
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