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| 型號： | ST2202 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8 BIT Integrated Microcontroller with 256K Bytes ROM |
| 中文描述： | 8位微控制器集成256K字節(jié)ROM的 |
| 文件頁數(shù)： | 59/65頁 |
| 文件大小： | 1946K |
| 代理商： | ST2202 |
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Sitronix
ST2202
Ver 2.0a
59/65
2003-May-05
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The watchdog timer (WDT) is an added check that a
program is running and sequencing properly. When the
application software is running, it is responsible for keeping
the 2- or 8-second watchdog timer from timing out. If the
watchdog timer times out, it is an indication that the
software is no longer being executed in the intended
sequence. At this time the watchdog timer generates a
reset signal to the system.
21.1 WDT Operations
The WDT is enabled by setting the WDT enable flag
WDTEN
(
MISC[3]
). Two time settings, 2 and 8 seconds,
are selectable with selection bit
WDTPS
(
MISC[2]
).WDT is
clocked by the 2Hz clock from the base timer and therefore
has 0.5-second resolution. It is recommended that the
watchdog timer be periodically cleared by software once it
is enabled. Otherwise, software reset will be generated
when the timer reached a binary value of 4 or 16.
Note:The WDT can be reset by writing any value
to
MISC
register.
After a system reset,
WDTEN
is cleared. Then the
WDT returns to be idle.
TABLE 21-1 System Miscellaneous Register (MISC)
Bit 7
Bit 6
Bit 5
-
-
-
Address Name R/W
Bit 4
-
Reset WDT
Bit 3
WDTEN WDTPS
Bit 2
Bit 1
TEST
Bit 0
TEST
Default
- - - - 0000
R
W
$038
MISC
Bit 2:
WDTPS :
WDT time-out time selection bit
0
= 8 seconds
1 = 2 seconds
Bit 3:
WDTEN :
WDT control bit
0
= Disable WDT
1 = Enable WDT
Bit 1~0:
TEST
:
These two bits should be both zero in normal operation
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST2202A | 制造商:SITRONIX 制造商全稱:SITRONIX 功能描述:8 BIT Integrated Microcontroller with 256K Bytes ROM |
| ST2203U | 制造商:SITRONIX 制造商全稱:SITRONIX 功能描述:8-Bit Microcontroller With 2K Bytes RAM |
| ST2204 | 制造商:SITRONIX 制造商全稱:SITRONIX 功能描述:8 BIT Integrated Microcontroller with 512K Bytes ROM |
| ST220-50T2KI | 功能描述:鉭質(zhì)電容器-濕式 ST220-50T2KI RoHS:否 制造商:Vishay/Tansitor 電容:2800 uF 電壓額定值:35 V ESR:0.35 Ohms 容差:20 % 端接類型:Axial 工作溫度范圍:- 55 C to + 85 C 制造商庫存號:T4 Case 外殼直徑:9.52 mm 外殼長度:26.97 mm 外殼寬度: 外殼高度: 系列:STE 產(chǎn)品:Tantalum Wet Hermetically Sealed 封裝:Bulk |
| ST220-50T2MI | 功能描述:鉭質(zhì)電容器-濕式 220UF 50V 20% T2 RoHS:否 制造商:Vishay/Tansitor 電容:2800 uF 電壓額定值:35 V ESR:0.35 Ohms 容差:20 % 端接類型:Axial 工作溫度范圍:- 55 C to + 85 C 制造商庫存號:T4 Case 外殼直徑:9.52 mm 外殼長度:26.97 mm 外殼寬度: 外殼高度: 系列:STE 產(chǎn)品:Tantalum Wet Hermetically Sealed 封裝:Bulk |
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