UPD78323 NEC, UPD78323 Datasheet - Page 40

• Manufacturer Part Number: UPD78323
• Description: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

40
3.10 WATCHDOG TIMER
be confirmed by checking that no watchdog timer interrupt has been generated. Thus, an instruction to clear the watchdog
timer (timer start) is set into each program module.
timer overflows, a watchdog timer interrupt is generated, and a low level is generated to WDTO pin, thereby notifying of
an error in the program.
been released.
The watchdog timer is used to prevent program overrun and deadlock. Normal operation of the program or system can
If the watchdog timer clear instruction is not cleared within the time period set into the watchdog timer and the watchdog
The watchdog timer can also be used to maintain the oscillation stabilizing time of the oscillator after the stop mode has
Figure 3-8 shows the watchdog timer configuration.
WDT STOP
WDT CLR
f
f
CLK
CLK
f
CLK
/2
/2
/2
10
12
8
Watchdog Timer (8 Bits)
Figure 3-8. Watchdog Timer Configuration
Clear
Overflow
Timer (5 Bits)
INTWDT
Oscillation Stabilizing
Time Controller
PD78323, 78324
WDTO