CHAPTER 9 WATCHDOG TIMER
User’s Manual U16898EJ3V0UD
152
Figure 9-5. Status Transition Diagram When “Low-Speed Internal Oscillator Can Be Stopped by
Software”
Is Selected by Option Byte
Reset
WDT clock: f
RL
Overflow time: 546.13 ms (MAX.)
WDT clock = f
RL
Select overflow time
(settable only once).
WDT clock: f
RL
Overflow time: 4.27 ms to 546.13 ms (MAX.)
WDT count continues.
STOP
WDT count stops.
HALT
WDT count stops.
STOP
instruction
HALT instruction
Interrupt
Interrupt
WDTE = “ACH”
Clear WDT counter.
WDT operation stops.
WDCS4 = 1
WDT clock: f
X
Overflow time: 2
13
/f
X
to 2
20
/f
X
WDT count continues.
WDT clock = f
X
Select overflow time
(settable only once).
WDT clock: f
RL
WDT count stops.
WDTE = “ACH”
Clear WDT counter.
LSRSTOP = 1
LSRSTOP = 0
STOP
WDT count stops.
HALT
WDT count stops.
STOP
instruction
HALT
instruction
Interrupt
Interrupt
STOP
instruction
Interrupt
Interrupt
HALT
instruction
WDTE = “ACH”
Clear WDT counter.