CHAPTER 21 CLOCK MONITOR
User’s Manual U16899EJ2V0UD
401
Figure 21-3. Timing of Clock Monitor (2/4)
(3) Clock monitor status after RESET input
(CLME = 1 is set after RESET input and at the end of high-speed system clock oscillation stabilization time)
CPU operation
Clock monitor status
CLME
RESET
Ring-OSC clock
High-speed
system clock
Reset
Oscillation stabilization time
Normal
operation
Clock supply
stopped
Normal operation (Ring-OSC clock)
Monitoring
Monitoring stopped
Monitoring
17 clocks
Set to 1 by software
RESET input clears bit 0 (CLME) of the clock monitor mode register (CLM) to 0 and stops the clock monitor
operation. When CLME is set to 1 by software at the end of the oscillation stabilization time (reset value of OSTS
register is 05H (2
16
/f
XP
)) of the high-speed system clock, monitoring is started.
(4) Clock monitor status after STOP mode is released
(CLME = 1 is set when CPU clock operates on high-speed system clock and before entering STOP mode)
Clock monitor status
Monitoring
Monitoring stopped
Monitoring
CLME
Ring-OSC clock
High-speed system clock
(CPU clock)
CPU operation
Normal
operation
STOP
Oscillation stabilization time
Normal operation
Oscillation
stopped
Oscillation stabilization time
(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 high-speed system clock oscillation stabilization time. Monitoring is stopped in
STOP mode and during the oscillation stabilization time.
Содержание MuPD78F0132H
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