CHAPTER 21 CLOCK MONITOR
User’s Manual U16899EJ2V0UD
400
Figure 21-3. Timing of Clock Monitor (1/4)
(1) When internal reset is executed by oscillation stop of high-speed system clock
4 clocks of Ring-OSC clock
High-speed
system clock
Ring-OSC clock
Internal reset signal
CLME
CLMRF
(2) Clock monitor status after RESET input
(CLME = 1 is set after RESET input and during high-speed system clock oscillation stabilization time)
CPU operation
Clock monitor status
CLME
Ring-OSC clock
High-speed
system clock
Reset
Oscillation
stopped
Oscillation stabilization time
Normal
operation
Clock supply
stopped
Normal operation (Ring-OSC clock)
Monitoring
Monitoring stopped
Monitoring
Waiting for end
of oscillation
stabilization time
Oscillation
stopped
17 clocks
Set to 1 by software
RESET
RESET input clears bit 0 (CLME) of the clock monitor mode register (CLM) to 0 and stops the clock monitor
operation. Even if CLME is set to 1 by software during the oscillation stabilization time (reset value of OSTS register
is 05H (2
16
/f
XP
)) of the high-speed system clock, monitoring is not performed until the oscillation stabilization time of
the high-speed system clock ends. Monitoring is automatically started at the end of the oscillation stabilization time.
Содержание MuPD78F0132H
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