CHAPTER 10 WATCHDOG TIMER
Preliminary User’s Manual U16315EJ1V0UD
217
(3) When the CPU clock is the Ring-OSC clock (f
R
) and the watchdog timer operation clock is the X1 input
clock (f
XP
) when the STOP instruction is executed
When the STOP instruction is executed, operation of the watchdog timer is stopped. After STOP mode is
released, counting is stopped until the timing of <1> or <2>, whichever is earlier, and then counting is started
using the operation clock before the operation was stopped. At this time, the counter is not cleared to 0.
<1>
The oscillation stabilization time set by the oscillation stabilization time select register (OSTS) elapses.
<2>
The CPU clock is switched to the X1 input clock (f
XP
).
Figure 10-6. Operation in STOP Mode
(CPU Clock: Ring-OSC Clock, WDT Operation Clock: X1 Input Clock)
<1>
Timing when counting is started after the oscillation stabilization time set by the oscillation stabilization time
select register (OSTS) has elapsed
Watchdog timer
Operating
Operation stopped
Operating
f
R
f
XP
CPU operation
17 clocks
Normal operation
(Ring-OSC clock)
Clock supply stopped
Normal operation (Ring-OSC clock)
Oscillation
stopped
STOP
Oscillation stabilization time
(set by OSTS register)
<2>
Timing when counting is started after the CPU clock is switched to the X1 input clock (f
XP
)
Operating
Operation stopped
Operating
f
R
f
XP
f
R
→
f
XP
Note
CPU operation
17 clocks
Normal operation
(Ring-OSC clock)
Clock supply
stopped
Normal operation (Ring-OSC clock)
Normal operation (X1 input clock)
CPU clock
Oscillation
stopped
STOP
Oscillation stabilization time
(set by OSTS register)
Watchdog timer
Note
Confirm the oscillation stabilization time of f
XP
using the oscillation stabilization time counter status register
(OSTC).
Содержание 78K0/KD1 Series
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