CPG0500A_000020020300
Rev. 1.00, 09/03, page 611 of 704
Section 21 Clock Pulse Generator
This LSI incorporates a clock pulse generator which generates the system clock (
φ
) and internal
clock. The clock pulse generator consists of an oscillator, duty adjustment circuit, and divider.
Figure 21.1 shows a block diagram of the clock pulse generator.
System clock
To pin
Internal clock
To peripheral modules
Oscillator
SCKCR: System clock control register
[Legend]
Duty
adjustment
circuit
Divider
SCKCR
SCK2 to SCK0
EXTAL
XTAL
Figure 21.1 Block Diagram of Clock Pulse Generator
The internal frequency is changed by software according to the settings of the system clock
control register (SCKCR).
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