參數資料
型號: DS1706EPA
英文描述: IC-MICRO MONITOR
中文描述: 集成電路,微型顯示器
文件頁數: 3/10頁
文件大小: 183K
代理商: DS1706EPA
DS1705/DS1706
3 of 10
Watchdog Timer
The watchdog timer function forces
WDS
signals active when the
ST
input is not clocked within the 1
second time-out period. Time-out of the watchdog starts when
RST
(or RST) becomes inactive. If a high-
to-low transition occurs on the
ST
input pin prior to time-out, the watchdog timer is reset and begins to
time out again. If the watchdog timer is allowed to time out, the
WDS
signal is driven active (low) for a
minimum of 130 ms. The
ST
input can be derived from many microprocessor outputs. The typical signals
used are the microprocessors address signals, data signals, or control signals. When the microprocessor
functions normally, these signals would, as a matter of routine, cause the watchdog to be reset prior to
time-out. To guarantee that the watchdog timer does not time out, a high-to-low transition must occur at
or less than the minimum watchdog time-out of 1 second. A typical circuit example is shown in Figure 6.
MICROMONITOR BLOCK DIAGRAM
Figure 1
PUSH-BUTTON RESET
Figure 2
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