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參數資料
| 型號： | MTA81010S-RCI/SO |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28 |
| 封裝： | 0.300 INCH, SOIC-28 |
| 文件頁數： | 26/76頁 |
| 文件大?。?/td> | 745K |
| 代理商： | MTA81010S-RCI/SO |
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MTA81010
DS39005D-page 32
1995 Microchip Technology Inc.
10.0
WATCHDOG TIMER (WDT)
The watchdog timer is realized as a free running on-
chip RC oscillator which does not require any external
components. That means that the WDT will run, even if
the clock on the OSC1/OSC2 pins of the device has
been stopped, for example, by execution of a SLEEP
instruction. A WDT time-out generates a device
RESET. The WDT can be permanently disabled by
programming a "zero" into a special EPROM fuse
which is not part of the normal program memory
EPROM. The development tools provide special
commands to program this fuse.
10.1
WDT Period
The WDT has a nominal time-out period of 18 ms, (with
prescaler).
The
time-out
periods
vary
with
temperature, VDD and process variations from part to
part (DC specifications). If longer time-out periods are
desired, a prescaler with a division ratio of up to 1:128
can be assigned to the WDT under software control by
writing to the OPTION register. Thus, time-out periods
up to 2.5 seconds can be realized.
The CLRWDT and SLEEP instructions clear the WDT
and the prescaler, if assigned to the WDT, and prevent
it from timing out and generating a device RESET.
The status bit "TO" in file register f3 will be cleared
upon a watchdog timer time-out.
The WDT period is a function of the supply voltage,
operating temperature, and will also vary from unit to
unit due to variations in the manufacturing process.
Please refer to the graphs in Section 16.0 and DC
specifications for more details.
10.2
WDT Programming Considerations
In a noisy application environment the OPTION register
can get corrupted. The OPTION register should be
updated at regular intervals.
It should also be taken in account that under worst case
conditions (VDD = Minimum, Temperature = Maximum,
maximum WDT prescaler) it may take several seconds
before a WDT time-out occurs.
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| MTA81010S-XTI/SO | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28 |
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