375
6.16
Clock Pulse Generator
6.16.1
Features
•
Comprises an oscillator, PLL (phase-locked loop) circuit, and frequency divider
•
Generates system clock (ø) and internal clock
6.16.2
Block Diagram
EXTAL
XTAL
PLL circuit
(
×
1,
×
2,
×
4)
Oscillator
Frequency
divider
System clock
To ø pin
Internal clock
To on-chip
supporting
modules
SCK2 to SCK0
SCKCR
STC0, STC1
PLLCR
Figure 6.17 Block Diagram of Clock Pulse Generator
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