CHAPTER 20 CLOCK MONITOR
Preliminary User’s Manual U16315EJ1V0UD
363
Figure 20-3. Timing of Clock Monitor (1/3)
(1) When internal reset is executed by oscillation stop of X1 input clock
4 clocks of Ring-OSC clock
X1 input clock
Ring-OSC clock
Internal reset signal
CLME
CLMRF
Note
Note
CLMRF is read by software and then automatically cleared to 0. CLMRF is cleared under the following
conditions.
•
RESET input
•
Internal reset signal generation by POC
•
After read by software
(2) Clock monitor status after STOP mode is released
(CLME = 1 is set when CPU clock operates on X1 input clock and before entering STOP mode)
Clock monitor status
Monitoring
Monitoring stopped
Monitoring
CLME
Ring-OSC clock
X1 input clock
CPU operation
Normal
operation
STOP
Oscillation stabilization time
Normal operation
Oscillation
stopped
Oscillation stabilization time
(set by OSTS register)
When bit 0 (CLME) of the clock monitor mode register (CLM) is set to 1 before entering STOP mode, monitoring
automatically starts at the end of the X1 input clock oscillation stabilization time. Monitoring is stopped in STOP mode
and during the oscillation stabilization time.
Содержание 78K0/KD1 Series
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