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參數資料
型號: W77E058A40PL
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44
封裝: ROHS COMPLIANT, PLASTIC, LCC-44
文件頁數: 61/87頁
文件大小: 594K
代理商: W77E058A40PL
W77E058A
Publication Release Date: April 17, 2007
- 61 -
Revision A10
instructions to reset the watchdog timer which will allow the code to run without any watchdog timer
interrupts. Now the watchdog timer reset is enabled and the watchdog interrupt may be disabled. If
any errant code is executed now, then the reset watchdog timer instructions will not be executed at
the required instants and watchdog reset will occur.
The watchdog time-out selection will result in different time-out values depending on the clock speed.
The reset, when enabled, will occur 512 clocks after the time-out has occurred.
Table 9. Time-out values for the watchdog timer
WD1
WD0
WATCHDOG
INTERVAL
2
17
2
20
2
23
2
26
NUMBER OF
CLOCKS
TIME
@ 1.8432 MHZ
TIME
@ 10 MHZ
TIME
@ 25 MHZ
0
0
131072
71.11 mS
13.11 mS
5.24 mS
0
1
1048576
568.89 mS
104.86 mS
41.94 mS
1
0
8388608
4551.11 mS
838.86 mS
335.54 mS
1
1
67108864
36408.88 mS
6710.89 mS
2684.35 mS
The Watchdog timer will de disabled by a power-on/fail reset. The Watchdog timer reset does not
disable the watchdog timer, but will restart it. In general, software should restart the timer to put it into
a known state.
The control bits that support the Watchdog timer are discussed below.
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