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參數(shù)資料
| 型號： | ST6393B1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
| 中文描述： | 8位微控制器HCMOS電視頻率合成帶OSD |
| 文件頁數(shù)： | 35/68頁 |
| 文件大?。?/td> | 560K |
| 代理商： | ST6393B1 |
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Figure37. HardwareActivated Watchdog Block Diagram
Figure 38. HardwareActivated Watchdog
Working Principle
HARDWARE ACTIVATED DIGITAL WATCH-
DOG FUNCTION
Thehardwareactivateddigitalwatchdogfunctioncon-
sistsof adowncounterthatisautomaticallyinitialized
afterresetsothatthisfunctiondoesnotneedtobeac-
tivatedbytheuserprogram.Asthewatchdogfunction
isalwaysactivatedthisdowncountercannotbeused
asatimer.Thewatchdogisusingonedataspacereg-
ister (HWDR location D8h). Thewatchdogregisteris
set to FEh on reset and immediately starts to count
down,requiring no software start. Similarly the hard-
ware activatedwatchdogcan not be stoppedor de-
layedbysoftware.
The watchdogtimecan be programmedusing the 6
MSbitsinthewatchdogregister,this givesthepossi-
bility to generatea reset in a time between3072 to
196608oscillatorcycles in64possiblesteps.(Witha
clock frequencyof 8MHz this means from384
μ
s to
24.576ms).The reset is preventedif the register is
reloadedwith the desired value beforebits 2-7 de-
crement fromall zerosto all ones.
Thepresenceofthehardwarewatchdogdeactivates
theSTOPinstructionandaWAITinstruction isauto-
matically executed instead of a STOP. Bit 1 of the
watchdogregister(settooneatreset)canbeusedto
generateasoftwareresetifclearedtozero).Figure37
shows the watchdog block diagram while Figure 38
showsitsworkingprinciple.
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST6395B1 | 8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
| ST6391B1 | MOSFET; Transistor Polarity:Dual N Channel; Continuous Drain Current, Id:2.6A; On-Resistance, Rds(on):0.18ohm; Package/Case:8-SOIC; Leaded Process Compatible:No; Mounting Type:surface mount; Peak Reflow Compatible (260 C):No |
| ST6392 | 8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
| ST6393 | 8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
| ST6395 | 8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST6395 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
| ST6395B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
| ST6397 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
| ST6397B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
| ST6399 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD |
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