參數(shù)資料
型號: UPD70433R-12
廠商: NEC Corp.
元件分類: 16位微控制器
英文描述: V55PITM 16-BIT MICROPROCESSOR
中文描述: V55PITM 16位微處理器
文件頁數(shù): 63/166頁
文件大小: 772K
代理商: UPD70433R-12
63
μ
PD70433
φ
*1
φ
φ
φ
/2
/2
/2
9
11
13
Frequency
Divider
Watchdog
Timer
(8 bits)
Clear
WDTCLR
RESET
STOP
*2
Overflow
WDTOUT
Active Timer
(5 bits)
INTWDT
Oscillation
Stabilizing
Time Control
Circuit
OVF
WDTOUT
S
Q
R
11. WATCHDOG TIMER FUNCTION
The watchdog timer is a function for preventing inadvertent program looping and deadlocks.
11.1 FEATURES
Three overflow times settable (8.1, 32.7, 131.0 [ms]: system clock
φ
= 16 MHz) (10.4, 41.9, 167.7 [ms]: system
clock
φ
= 12.5 MHz)
Output pin provided (WDTOUT pin) which can be directly connected to the RESET pin
11.2 WATCHDOG TIMER CONFIGURATION AND OPERATION
Non-generation of a watchdog timer interrupt enables normal operation of the program or system to be confirmed. To
use the watchdog function, an instruction (RSTWDT) to clear the watchdog timer (start the count) must be included in at
fixed intervals in the program execution time, at the start of a subroutine, etc.
If the instruction which clears the watchdog timer is not executed within the set time and the watchdog timer overflows,
a watchdog timer interrupt (INTWDT) is generated and the low-level signal is output to the WDTOUT pin to report a program
error.
The watchdog timer configuration is shown in Figure 11-1.
Figure 11-1. Watchdog Timer Configuration Diagram
* 1.
φ
: System clock
WDTCLR: Watchdog timer clearance by instruction
2.
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