tmp88fw45afg TOSHIBA Semiconductor CORPORATION, tmp88fw45afg Datasheet - Page 83

• Manufacturer Part Number: tmp88fw45afg
• Description: 8 Bit Microcontroller Tlcs-870/x Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

7. Watchdog Timer (WDT)
7.1
noises or the deadlock conditions, and return the CPU to a system recovery routine.
non-maskable interrupt request”. Upon the reset release, this signal is initialized to “reset request”.
Watchdog Timer Configuration
The watchdog timer is a fail-safe system to detect rapidly the CPU malfunctions such as endless loops due to spurious
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 interrupt.
Note:Care must be taken in system design since the watchdog timer functions are not be operated completely due to
Internal reset
fc/2
fc/2
fc/2
fc/2
effect of disturbing noise.
23
21
19
17
,fc/2
,fc/2
,fc/2
,fc/2
24
22
20
18
WDTT
2
0034
WDTEN
Watchdog timer control registers
Figure 7-1 Watchdog Timer Configuration
H
WDTCR1
Clock
Clear
S R
Q
Binary counters
Writing
disable code
1
Controller
0035
2
H
WDTCR2
Page 69
Overflow
Writing
clear code
WDT output
WDTOUT
Reset release
Interrupt request
R
S
Q
TMP88FW45AFG
Reset
request
INTWDT
interrupt
request