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Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
(3)
When released by Watchdog Timer RESET input
CPU operation starts after main oscillation stabilization time has been secured.
Figure 9-12:
Sub Watch mode release by Watchdog reset, NMI, INT
After oscillator stabilization time has passed, CPU starts operation.
Remark:
Before entering the SUB WATCH mode the SSCG and the PLL are switched off by hard-
ware. After the SUB WATCH mode has been released the PLL can be switched on by soft-
ware again once. However, the start-up of the PLL causes always a certain delay of some
Milliseconds. During this time, the clock operates, but the CPU operation is suspended due
to clock security reasons.
If it is required to have a fast response when waking up from SUB WATCH mode, the PLL
should not be re-enabled after waking up, as this causes again the delay. In this case, time-
relevant reactions of the CPU should be done first, before re-enabling the PLL.
Main Oscillation circuit stop
Sub-Watch mode setting
Main Oscillation circuit
System clock
Main OSC STOP state
Stabilization counter
count time
NMI or INT input
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