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CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
5.2 CLOCK GENERATION CIRCUIT
The clock generation circuit supplies various clocks to the CPU and peripheral hardware, and controls the
operating mode of the CPU.
5.2.1 Clock Generation Circuit Configuration
The configuration of the clock generation circuit is shown in Fig. 5-10.
Fig. 5-10 Clock Generation Circuit Block Diagram
Remarks 1. fXX = System clock frequency
2. fX = External clock frequency
3. PCC: Processor clock control register
4. 1 clock cyck (fCY) of
Φ
is 1 machine cycle of an instruction.
*Instruction execution
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