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Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
Table 9-8:
Operation after WATCH mode release by interrupt request
Remark:
If WATCH mode is entered during execution of a particular interrupt handler and an
unmasked interrupt request with a higher priority than the previous one is subsequently
generated, the program branches to the vector address for the later interrupt.
(2)
When released by RESET input
This operation is the same as normal reset operation except oscillation stabilization time is not
required.
(3)
When released by Watchdog Timer RESET input
After oscillator stabilization time has passed, CPU starts operation.
Remark:
Before entering the WATCH mode the SSCG and PLL are switched off by hardware. After
the WATCH mode has been released the SSCG and PLL can be switched on by software
once.
However, the start-up of the SSCG and PLL cause 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 WATCH mode, the SSCG and
PLL should not be re-enabled immediately 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
SSCG and PLL.
Release cause
EI state
DI state
NMI request
Branches to handler address.
Maskable interrupt
request
Branches to handler address, or
executes the next instruction.
Executes the next instruction.
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