tmp88cs38ng TOSHIBA Semiconductor CORPORATION, tmp88cs38ng Datasheet - Page 56

• Manufacturer Part Number: tmp88cs38ng
• Description: Cmos 8-bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.4
2.4.1
Internal reset
fc/2
fc/2
fc/2
fc/2
Watchdog Timer (WDT)
endless looping caused by noise or the like, or deadlock and resume the CPU to the normal
state.
pseudo non-maskable interrupt request. However, selection is possible only once after reset. At
first the reset output is selected.
timer to generate an interrupt at fixed intervals.
Note: Care must be given in system design so as to protect the watchdog timer from disturbing
23
21
19
17
, fc/2
, fc/2
, fc/2
, fc/2
The watchdog timer is a fail-safe system to rapidly detect the CPU malfunctions such as
The watchdog timer signal for detecting malfunction can be selected either a reset output or a
When the watchdog timer is not being used for malfunction detection, it can be used as a
Watchdog Timer Configuration
24
22
20
18
noise. Otherwise the watchdog timer may not fully exhibit its functionality.
WDTT
A
B
C
D
2
MPX
S
00034H
WDTEN
Y
WDTCR1
Watchdog timer control registers
Figure 2.4.1 Watchdog Timer Configuration
Clock
S
Clear
Q
R
Binary counters
Writing
disable code
1
Controller
2
00035H
88CS38-56
Overflow
WDTCR2
Writing
clear code
WDT output
WDTOUT
Reset release signal from T.G.
TMP88CS38/CM38A/CP38A
Interrupt request
R
S
MPX: Multiplexer
Q
Reset output
2007-09-12
INTWDT
RESET