參數(shù)資料
型號(hào)： ST6397
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(yè)數(shù)： 35/68頁(yè)
文件大?。?/td> 560K
代理商： ST6397
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.
ST6391,92,93,95,97,99
31/64
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