CHAPTER 17 CLOCK MONITOR
Preliminary User’s Manual U16846EJ1V0UD
316
Figure 17-3. Timing of Clock Monitor (3/4)
(5) Clock monitor status after STOP mode is released
(CLME = 1 is set when CPU clock operates on Ring-OSC clock and before entering STOP mode)
Clock monitor status
Monitoring
Monitoring
stopped
Monitoring stopped
Monitoring
CLME
Ring-OSC clock
(CPU clock)
High-speed
system clock
CPU operation
Normal
operation
17 clocks
Clock supply
stopped
Normal operation
Oscillation
stopped
Oscillation stabilization time
(time set by OSTS register)
STOP
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 high-speed system clock oscillation stabilization time. Monitoring is stopped in
STOP mode and during the oscillation stabilization time.
(6) Clock monitor status after high-speed system clock oscillation is stopped by software
Clock monitor status
CLME
Ring-OSC clock
MSTOP
High-speed
system clock
Oscillation stabilization time
(time set by OSTS register)
Normal operation (Ring-OSC clock)
Monitoring
Monitoring
stopped
Monitoring
CPU operation
Monitoring stopped
Oscillation
stopped
When bit 0 (CLME) of the clock monitor mode register (CLM) is set to 1 before or while oscillation of the high-
speed system clock is stopped, monitoring automatically starts at the end of the high-speed system clock oscillation
stabilization time. Monitoring is stopped when oscillation of the high-speed system clock is stopped and during the
oscillation stabilization time.