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ýw
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l(f)ڣ[2018-6-9]    [6352]ΡЇ늚ЈُW(wng)[EM39.com]{(bio)pԄӝL}
      ʲôǿT(watchdog)

T,ֽ watchdog timer,һr·, һһݔ,ι,һݔMCURST,MCUĕr,ÿһ˕rgݔһ̖ι,o WDT ,^Ҏ(gu)ĕrgι,(һڳwr),WDT r^,ͻؽoһ(f)λ̖MCU,MCU(f)λ. ֹMCUC. TþǷֹl(f)ѭh(hun)fw

ԭϵy(tng)\ԺҲ͆˿TӋ(sh)T_ʼԄӋ(sh)һĕrg߀ȥ忴TôTӋ(sh)͕ĶTДϵy(tng)(f)λʹпTоƬrҪע忴T
ӲTһrO(jin)\Ҳf\^҂Ҫڶrrg֮ǰrM(jn)Џ(f)λF(xin)ѭh(hun)fPCָᘲܻ؁ôrrg͕ʹƬC(f)λõWDTоƬMAX813 ,5045, IMP 813,r4~10Ԫ.

ܛTg(sh)ԭ@ֻ^ܛķF(xin)҂߀51ϵЁv҂֪51ƬCЃɂr҂Ϳ@ɂr팦\M(jn)бO(jin)҂ԌT0O(sh)һĶrrg(dng)a(chn)rДĕr?q)һ׃M(jn)xֵ@׃\е_ʼѽ(jng)һֵ@҂ҪO(sh)ĶrֵҪС\Еrg@β׃ֵM(jn)Дֵ࣬l(f)A(y)ڵ׃fT0Д]аl(f)׃tʹ(f)λT1҂ÁO(jin)\҂oT1O(sh)һĶrrgЌM(jn)Џ(f)λһĕrgM(jn)Џ(f)λT1 ĶrД͕ʹƬC(f)λ@T1ĶrrgҪO(sh)Ĵ\ЕrgoһĵԣT1Дc҂T0rДӳO(jin)ҕ@Ӿ͉һѭh(hun)T0O(jin)ҕT1T1O(jin)ҕցO(jin)ҕT0ĶCϵy(tng)ķ(wn)\

51 ϵЌTĿTr,ϵy(tng)lM(jn)зlӋ(sh),rr,(f)λ.TO(sh),ҲɆΪÁ鶨rʹ.
61ĿT^һһǕrgһڶǹڌHʹֻѭh(hun)(dng)м幷ָOK

C8051FxxxƬC(ni)Ҳһ21λʹϵy(tng)r犵Ķrԓrzy Ĵăɴضĕrgg@rgg^˾̵ĘOֵa(chn)һWDT(f)λ
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Tʹע⣺(sh)51 ϵІƬCпT,(dng)T]бrr,(f)λ@ɷֹwO(sh)Ӌ߱TrgԛQںmĕr忴T忴TҲ̫^ltYԴM\Еrܛÿһĕrg(Сڶr)orÔ(sh)A(y)Д`(f)λ
T\ãTǻ֏(f)ϵy(tng)\мЧıO(jin)ҕi(q)iκָڼͥзֹСo(ji)ƵΑϾW(wng)񣩵Ⱦкܺõđ(yng)Ãrֵ.

ϵy(tng)ܛ"T"O(sh)Ӌ˼·

1.TrT0O(sh)ڳʼKO(sh)T0Ĺʽ_ДӋ(sh)ܡϵy(tng)Fosc=12 MHzT016λӋ(sh)Ӌ(sh)ֵ(210η)-1=65 535T0ݔӋ(sh)lǣFosc/12ڞ(65 535+1)1=65 536(s)

2.Ӌسѭh(hun)һεĺĕr]ϵy(tng)ģKѭh(hun)Δ(sh)ϵy(tng)Ƴ\Еrgs166 msϵy(tng)O(sh)"T"rT0r30 ms(T0ijֵ65 536-30 000=35 536)سÿѭh(hun)ˢT0ijֵM(jn)"ѭh(hun)"T0ijֵ30 ms(ni)δˢ£@r"T"rT0ՈД

3.O(sh)ӋT0(yng)Д(w)ӳֻһlָT0(yng)Дַ(000BH)"olD(zhun)"ӋCϻĵһƬCM(jn)гʼ@_Ĉ(zh)
dֻfϢվ^cCϢHD(zhun)dՈע̎




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