tmp88ch40img TOSHIBA Semiconductor CORPORATION, tmp88ch40img Datasheet - Page 49

• Manufacturer Part Number: tmp88ch40img
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

6. Watchdog Timer (WDT)
6.1 Watchdog Timer Configuration
rious noises or the deadlock conditions, and return the CPU to a system recovery routine.
nonmaskable interrupt request”. Upon the reset release, this signal is initialized to “reset request”.
rupt.
Internal reset
The watchdog timer is a fail-safe system to detect rapidly the CPU malfunctions such as endless loops due to spu-
The watchdog timer signal for detecting malfunctions can be programmed only once as “reset request” or “pseudo
When the watchdog timer is not used to detect malfunctions, it can be used as the timer to provide a periodic inter-
Note: Care must be taken in system design since the watchdog timer functions are not be operated completely due to
fc/2
fc/2
fc/2
fc/2
23
21
19
17
effect of disturbing noise.
,fc/2
,fc/2
,fc/2
,fc/2
24
22
20
18
WDTT
2
0034
WDTEN
Watchdog timer control registers
H
WDTCR1
Figure 6-1 Watchdog Timer Configuration
Clock
Clear
S R
Q
Binary counters
Writing
disable code
1
Controller
0035
2
H
WDTCR2
Overflow
Page 41
Writing
clear code
WDT output
WDTOUT
Reset release
Interrupt request
R
S
Q
TMP88CH40IMG
Reset
request
INTWDT
interrupt
request