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ʲôǿT(mn)(watchdog)

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l(f)ڣ[2018-6-9]    [6396]ΡЇ(gu)늚Ј(chng)ُ(gu)W(wng)[EM39.com]{(bio)pԄ(dng)L}
      ʲôǿT(mn)(watchdog)

T(mn),ֽ watchdog timer,һ(g)r(sh)·, һһ(g)ݔ,ι,һ(g)ݔMCURST,MCUĕr(sh),ÿһ˕r(sh)gݔһ(g)̖(ho)ι,o WDT ,^(gu)Ҏ(gu)ĕr(sh)gι,(һڳwr(sh)),WDT r(sh)^(gu),ͻؽoһ(g)(f)λ̖(ho)MCU,MCU(f)λ. ֹMCUC(j). T(mn)þǷֹl(f)ѭh(hun)f(shu)w

ԭϵy(tng)\(yn)ԺҲ͆(dng)˿T(mn)Ӌ(j)(sh)T(mn)_(ki)ʼԄ(dng)Ӌ(j)(sh)һĕr(sh)g߀ȥ忴T(mn)ôT(mn)Ӌ(j)(sh)͕(hu)ĶT(mn)Дϵy(tng)(f)λʹпT(mn)оƬr(sh)Ҫע忴T(mn)
ӲT(mn)һ(g)r(sh)(li)O(jin)\(yn)Ҳf(shu)\(yn)^(gu)҂Ҫڶr(sh)r(sh)g֮ǰ(du)r(sh)M(jn)Џ(f)λF(xin)ѭh(hun)f(shu)PCָᘲܻ؁(li)ôr(sh)r(sh)g͕(hu)ʹƬC(j)(f)λõWDTоƬMAX813 ,5045, IMP 813,r(ji)4~10Ԫ.

ܛT(mn)g(sh)ԭ@ֻ࣬^(gu)ܛķ(sh)F(xin)҂߀51ϵЁ(li)v҂֪51ƬC(j)Ѓɂ(g)r(sh)҂Ϳ@ɂ(g)r(sh)(li)(du)\(yn)M(jn)бO(jin)ء҂Ԍ(du)T0O(sh)һĶr(sh)r(sh)g(dng)a(chn)r(sh)Дĕr(sh)?q)һ(g)׃M(jn)xֵ@(g)׃\(yn)е_(ki)ʼѽ(jng)һ(g)ֵ@҂ҪO(sh)Ķr(sh)ֵҪС\(yn)Еr(sh)g@β(du)׃ֵM(jn)Дֵl(f)A(y)ڵ׃f(shu)T0Д](mi)аl(f)׃tʹ(f)λ(du)T1҂Á(li)O(jin)\(yn)҂oT1O(sh)һĶr(sh)r(sh)gЌ(du)M(jn)Џ(f)λһĕr(sh)g(du)M(jn)Џ(f)λT1 Ķr(sh)Д͕(hu)ʹƬC(j)(f)λ@T1Ķr(sh)r(sh)gҪO(sh)Ĵ\(yn)Еr(sh)goһĵԣT1Дc҂?c)T0r(sh)Дӳ(li)O(jin)ҕ@Ӿ͉һ(g)ѭh(hun)T0O(jin)ҕT1T1O(jin)ҕց(li)O(jin)ҕT0ĶCϵy(tng)ķ(wn)\(yn)

51 ϵЌ(zhun)T(mn)ĿT(mn)r(sh),(du)ϵy(tng)lM(jn)зlӋ(j)(sh),r(sh)r(sh),(f)λ.T(mn)O(sh),ҲɆΪ(d)Á(li)鶨r(sh)ʹ.
(yng)61ĿT(mn)^һһ(g)Ǖr(sh)gһڶǹڌ(sh)Hʹֻѭh(hun)(dng)м幷ָOK

C8051FxxxƬC(j)(ni)Ҳһ(g)21λʹϵy(tng)r(sh)犵Ķr(sh)ԓr(sh)zy(c)(du) Ĵăɴض(xi)ĕr(sh)gg@(g)r(sh)gg^(gu)˾̵ĘOֵa(chn)һ(g)WDT(f)λ
--------------------------------------------------------------------------------
T(mn)ʹע⣺(sh)51 ϵІƬC(j)пT(mn),(dng)T(mn)](mi)бr(sh)r(sh),(f)λ@ɷֹwO(sh)Ӌ(j)߱T(mn)r(sh)gԛQںmĕr(sh)忴T(mn)忴T(mn)Ҳ̫^(gu)lt(hu)YԴM(fi)\(yn)Еr(sh)ܛÿһĕr(sh)g(Сڶr(sh))or(sh)Ô(sh)A(y)Д`(f)λ
T(mn)\(yn)ãT(mn)ǻ֏(f)ϵy(tng)\(yn)мЧıO(jin)ҕi(q)iκָڼͥзֹСo(w)(ji)ƵΑϾW(wng)񣩵Ⱦкܺõđ(yng)Ãr(ji)ֵ.

ϵy(tng)ܛ"T(mn)"O(sh)Ӌ(j)˼·

1.T(mn)r(sh)T0O(sh)ڳʼKO(sh)T0Ĺʽ_(ki)ДӋ(j)(sh)ܡϵy(tng)Fosc=12 MHzT016λӋ(j)(sh)Ӌ(j)(sh)ֵ(210η)-1=65 535T0ݔӋ(j)(sh)lǣFosc/12ڞ(65 535+1)1=65 536(s)

2.Ӌ(j)سѭh(hun)һεĺĕr(sh)]ϵy(tng)ģKѭh(hun)Δ(sh)ϵy(tng)Ƴ\(yn)Еr(sh)gs166 msϵy(tng)O(sh)"T(mn)"r(sh)T0r(sh)30 ms(T0ijֵ65 536-30 000=35 536)سÿѭh(hun)ˢT0ijֵM(jn)"ѭh(hun)"T0ijֵ30 ms(ni)δˢ£@r(sh)"T(mn)"r(sh)T0Ո(qng)Д

3.O(sh)Ӌ(j)T0(du)(yng)Д(w)򡣴ӳֻһlָT0(du)(yng)Дַ(000BH)(xi)"o(w)lD(zhun)"Ӌ(j)C(j)ϻ(g)ĵһ(du)ƬC(j)M(jn)гʼ@_Ĉ(zh)
dֻfϢվ^c(din)C(sh)ϢHD(zhun)dՈ(qng)ע̎




һƪЩA(y)A(y)񹤳ʩϴʩ
ƪʲôǿT(mn)(watchdog)늚ُ(gu)W(wng)(ُ(gu)W(wng))ИI(y)„
һƪЩA(y)A(y)񹤳ʩϴʩ
 
   T(mn)„
2011҇(gu)坍Դa(chn)I(y)l(f)չڅ(sh)
Ї(gu)Ya(chn)ؽMُ(gu)څ(sh)
2013꽛(jng)(j){(ln)Ƥ(sh)l(f)(hu)(sh)
(ni)ɹ110kVݔ׃늹O(sh)Ӌ(j)
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