Datasheet

Section 5 Clock Pulse Generators
Rev. 3.00 Sep. 14, 2006 Page 75 of 408
REJ09B0105-0300
5.3 System Clock Select Operation
Figure 5.2 shows the state transition of the system clock.
Reset state
LSI operates on on-chip oscillator clock
On-chip oscillator: Operated
External oscillator: Halted
Switching to
external clock
On-chip oscillator: Halted
External oscillator: Operated
On-chip oscillator: Operated
External oscillator: Operated
On-chip oscillator halted
On-chip oscillator operated
LSI operates on external oscillator
Reset release
Switching to
on-chip oscillator
Figure 5.2 State Transition of System Clock