tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 482

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

18. Watchdog Timer (Runaway Detection Timer)
Watchdog Timer
18.1 Configuration
Internal reset
The TMP19A44 has a built-in watchdog timer for detecting runaways.
The watchdog timer (WDT) is for detecting malfunctions (runaways) of the CPU caused by noises or other
disturbances and remedying them to return the CPU to normal operation. If the timer detects a runaway, it
generates a non-maskable interrupt to notify the CPU.
By connecting the output of the watchdog timer to a reset pin (inside the chip), it is possible to force the
watchdog timer to reset itself.
Fig. 18.1 shows the block diagram of the watchdog timer.
f
SYS
/2
WDMOD
<WDTP1 : 0>
(Runaway Detection Timer)
Binary counter
(22 stages)
Fig. 18.1 Block Diagram of the Watchdog Timer
2
16
Watchdog timer control register
2
18
Selector
Write
4EH
2
Internal data bus
20
2
WDCR
Reset
22
TMP19A44(rev0.3) 18-1
Write
B1H
WDMOD <RESCR>
R
Reset control
WDMOD <WDTE>
Q
S
Interrupt request
INTWDT
TMP19A44
Internal reset
RESET pin
2010-04-01