CHAPTER 21 CLOCK MONITOR
User’s Manual U16896EJ2V0UD
606
(a) Operation when main clock oscillation is stopped
If oscillation of the main clock is stopped when the CLME bit = 1, the CLMRES signal is generated as
shown in Figure 21-1.
Figure 21-1. When Oscillation of Main Clock Is Stopped
4 internal oscillation clocks
Main clock
Internal oscillation
clock
CLMRES
signal
(active low)
(b) Operation in STOP mode and after STOP mode is released
If the STOP mode is set when the CLME bit = 1, the monitor operation is stopped in the STOP mode and
while the oscillation stabilization time is being counted. The monitor operation is automatically started after
the oscillation stabilization time has elapsed.
Figure 21-2. Operation in STOP Mode and After STOP Mode Is Released
Clock monitor status
During
monitoring
Monitor stops
During monitoring
CLME
bit
Internal oscillation
clock
Main clock
CPU operation
Normal
operation
STOP
mode
Oscillation stabilization time
Normal operation
Oscillation stops
Oscillation stabilization time
(set by OSTS register)
Содержание ?PD703302
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