HOLTEK HT8 MCU LVD LVR Aikace-aikacen

HT8 MCU LVD/LVR Dokokin Aikace-aikacen

D/N: AN0467EN

Gabatarwa

Yankin Holtek 8-bit MCU yana ba da ayyuka biyu masu amfani sosai kuma masu amfani, LVD (Low Voltage Ganewa) da LVR (Low Voltage Reset). Idan MCU wutar lantarki voltage (VDD) ya zama maras al'ada ko maras tabbas, waɗannan ayyuka za su ba da damar MCU ta ba da gargaɗi ko aiwatar da sake saiti nan take don taimaka wa samfurin don ci gaba da aiki daidai.
Dukansu LVD da LVR ana amfani dasu don saka idanu akan wutar lantarki ta MCU voltage (VDD). Lokacin da aka gano ƙimar wutar lantarki ya yi ƙasa da ƙaramin vol da aka zaɓatage darajar, aikin LVD zai haifar da siginar katsewa inda aka saita tutocin LVDO da katse duka. Ayyukan LVR ya bambanta domin nan da nan ya tilasta MCU sake saiti. Wannan bayanin kula na aikace-aikacen zai ɗauki HT66F0185 azaman tsohonampMCU don gabatar da dalla-dalla ayyukan LVD da LVR don Holtek Flash MCUs.

Bayanin Aiki

LVD - Low Voltage Gano

Yawancin Holtek MCUs suna da aikin LVD, wanda ake amfani da shi don saka idanu na VDD voltage. Lokacin da VDD voltage yana da ƙarancin ƙima fiye da daidaitawar LVD voltage kuma yana dawwama na ɗan lokaci fiye da lokacin tLVD, sannan za a haifar da siginar katsewa. Anan za a saita tutar LVDO da tutar katsewar LVD. Masu haɓakawa na iya gano siginar don tantance ko tsarin yana cikin ƙaramin voltage. MCU na iya aiwatar da ayyukan da suka dace don kiyaye tsarin yana aiki akai-akai da aiwatar da kariya ta saukar da wuta da sauran ayyuka masu alaƙa.
Ana sarrafa aikin LVD ta amfani da rajista ɗaya da aka sani da LVDC. Ɗaukar HT66F0185 azaman example, rago uku a cikin wannan rijistar, VLVD2~VLVD0, ana amfani da su don zaɓar ɗaya daga cikin ƙayyadaddun vol.tages a kasa wanda low voltagza a ƙayyade yanayin e. Abun LVDO shine bit ɗin fitarwa na kewaye na LVD. Lokacin da ƙimar VDD ta fi VLVD girma, za a share bit ɗin tutar LVDO zuwa 0. Lokacin da ƙimar VDD ta yi ƙasa da VLVD, za a saita bit flag na LVDO da katse buƙatun LVF. Gabaɗaya, ƙaramin tuta na katse LVF yana cikin katsewar ayyuka da yawa kuma shirin aikace-aikacen dole ne a share shi. Yawancin rajistar ayyukan LVD sun yi kama da abin da aka nuna a cikin Hoto 1, duk da haka yana da kyau a koma zuwa bayanan bayanan MCU don cikakkun bayanai saboda za a iya keɓance wannan.

Ana saita aikin HT8 MCU LVD ta hanyar amfani da zaɓuɓɓukan sanyi ko software. Mai zuwa yana bayanin tsarin software na HT66F0185 MCU.

Hoto 1
LVR - Low Voltage Sake saiti

HT8 MCUs sun ƙunshi ƙaramin voltage sake saita da'ira don saka idanu da VDD voltage. Lokacin da VDD voltage ƙimar ta yi ƙasa da ƙimar VLVR da aka zaɓa kuma tana dawwama na ɗan lokaci fiye da lokacin tLVR, sannan MCU zai aiwatar da ƙaramin vol.tage sake saiti kuma shirin zai shigar da yanayin sake saiti. Lokacin da ƙimar VDD ta koma ƙima sama da VLVR, MCU zata koma aiki na yau da kullun. Anan shirin zai sake farawa daga adireshin 00h, yayin da kuma za a saita alamar tutar LVRF kuma wanda shirin aikace-aikacen dole ne a share shi zuwa 0.
Ɗaukar HT66F0185 azaman example, LVR yana samar da voltages a cikin rajistar LVRC. Lokacin da ƙimar daidaitawar rijistar ba ɗayan waɗannan voltage dabi'u, MCU za ta haifar da sake saiti kuma rajistan zai dawo zuwa ƙimar POR. Hakanan MCU na iya amfani da aikin LVR don ƙirƙirar sake saitin software.

Hoto 2
Lura: Lokacin sake saiti na iya zama daban-daban a cikin MCU daban-daban, saboda haka yana da mahimmanci a koma zuwa takamaiman takaddun bayanai Mafi ƙarancin aiki.tages na iya bambanta a mitocin tsarin daban-daban. Masu amfani za su iya saita VLVR bisa ga ƙaramin aiki voltage na mitar tsarin da aka zaɓa don sa tsarin yayi aiki akai-akai.

Babban Siffofin

tLVDS (LVDO Stable Time)
Samfurin na iya kashe aikin LVD don ajiye wuta kuma zai iya sake kunna shi lokacin da ake buƙatar amfani da shi. Tun da aikin LVD yana buƙatar lokacin daidaitawa har zuwa 150μs daga naƙasasshe don samun cikakken kunnawa, wajibi ne a saka lokacin jinkiri don aikin LVD ya daidaita kafin amfani da LVD don tantance daidai ko MCU yana cikin ƙaramin vol.tage state.

Hoto 3
tLVD (Mafi ƙarancin Voltage Nisa don Katsewa)
Bayan gano ƙaramin voltage siginar, LVD kuma na iya amfani da katsewar LVD don gano kunnanta da kuma jefa ƙuri'a na LVDO. Wannan zai inganta ingantaccen shirin. Katsewar LVD yana faruwa lokacin da ƙimar VDD ta yi ƙasa da ƙimar gano LVDtage kuma yana dawwama na ɗan lokaci fiye da lokacin tLVD. Ana iya samun hayaniya akan wutar lantarki, musamman lokacin gwajin EMC a aikace-aikacen AC, don haka akwai yuwuwar yiwuwar kuskuren yanayin LVD yana faruwa. Koyaya, lokacin tLVD yakamata ya iya tace wannan amo, yana sa gano LVD ya fi karko.

tLVR (Mafi ƙarancin Voltage Nisa don Sake saitawa)
Lokacin da ƙimar VDD ta yi ƙasa da na LVR voltage kuma ya ci gaba na ɗan lokaci ya wuce lokacin tLVR, MCU zai aiwatar da ƙaramin voltage sake saiti. Samun wannan lokacin tLVR yana ba da damar hayaniyar samar da wutar lantarki don tacewa, yana sa gano LVR ya fi kwanciyar hankali.

Ka'idojin Aiki

Bambanci tsakanin ayyukan LVD da LVR shine cewa aikin LVD yana haifar da siginar gargaɗi kawai wanda ke sanar da MCU a gaba na vol.tage rashin zaman lafiya ko rashin daidaituwa. Don haka MCU na iya ɗaukar matakan da suka dace ko aiwatar da hanyoyin kariya. LVR ya bambanta da cewa yana aiwatar da sake saitin MCU. Anan MCU ta sake saitawa nan da nan don haka yayi tsalle zuwa yanayin shirin farko. Saboda haka, lokacin amfani da duka ayyuka tare, LVR voltage gabaɗaya ana saita shi don samun ƙaramin saitaccen voltage fiye da LVD voltage. Lokacin da ƙimar VDD ta faɗi, aikin LVD zai fara farawa da farko don ba da damar MCU don aiwatar da wasu matakan kariya kafin aikin LVR ya jawo, wanda yakamata ya kiyaye daidaiton samfur.
Ɗaukar HT66F0185 azaman example, mitar tsarin shine 8MHz da voltage kewayon tsakanin 2.2V da 5.5V. Idan LVR sake saitin voltage an saita shi don zama 2.1V, sannan ya bayyana kamar aikin LVR baya rufe ƙaramin aiki.tage. Koyaya mafi ƙarancin 2.2V MCU aiki voltage baya ayyana wurin da HIRC ko crystal oscillators suka daina oscillator, don haka LVR vol.tage an saita shi tare da 2.1V voltage ba zai shafi amfani da MCU na yau da kullun ba.
Don mitar tsarin 16MHz da 20MHz, aikin voltage shine 4.5V ~ 5.5V LVR sake saitin voltage an saita shi don zama 3.8V, sannan ya bayyana kamar dai aikin LVR baya rufe ƙaramin aiki na MCUtage don 16MHz da 20MHz. Koyaya, mafi ƙarancin 4.5V MCU aiki voltage baya ayyana ma'anar inda oscillator kristal ke daina murɗawa, don haka ga juzu'itage kewayon 3.8V ~ 4.5V crystal oscillator zai ci gaba da aiki. Anan babu damuwa game da aikin shirin mara kyau.
Idan mitar tsarin shine 16MHz ko 20MHz kuma idan an saita LVR zuwa ƙimar 3.8V to lokacin da VDD vol.tage ya faɗi ƙasa da 3.8V, aikin LVR zai kunna kuma ya sake saita MCU. Ƙimar farko ta LVRC shine 2.1V don sake saitin LVR, anan jihohi biyu masu zuwa zasu faru:

• Lokacin da VDD ya faɗi ƙasa da 3.8V, amma ba ƙasa da ƙaramin madaidaicin oscillation kristal ba, MCU za ta yi oscillate kullum bayan sake saitin LVR. Shirin zai saita rajistar LVRC. Bayan an daidaita rijistar LVRC, MCU za ta yi sake saitin LVR bayan jiran lokacin tLVR, sannan a maimaita.
• Idan ƙimar VDD ta faɗi ƙasa da 3.8V, voltage ya riga ya kasance ƙasa da wurin farawa na oscillator, saboda haka MCU ba za ta iya fara oscillation ba bayan sake saitin LVR. Duk tashoshin I/O zasu tsohuwa zuwa yanayin shigarwa bayan an sake saiti. MCU ba zai aiwatar da kowane umarni ba kuma ba zai aiwatar da kowane mataki akan da'irar ba.

La'akari da aikace-aikace

Lokacin amfani da LVD
Ana amfani da aikin LVD galibi don bincika yanayin baturi a aikace-aikacen samfur mai ƙarfin baturi. Lokacin da aka gano cewa batir yana ƙarewa, MCU na iya sa mai amfani ya maye gurbin baturin don ci gaba da aiki na yau da kullun. A cikin samfuran AC gama gari, ana amfani da aikin LVD don gano ma'aunin VDDtage, wanda za'a iya amfani dashi don sanin ko an cire haɗin wutar lantarki ta AC. Don misaliample, don rufin lamp, Ta hanyar saka idanu da ƙananan LVDO daga ƙananan zuwa babba sannan kuma ƙarami, ana iya ƙayyade idan ana amfani da canji don canza rufin l.amp yanayin don canza matakin haske ko zafin launi.

Lokacin amfani da LVR
Ana yawan amfani da aikin LVR a aikace-aikacen da ke da ƙarfin baturi kuma ana kunna shi lokacin da ake canza baturi. Gabaɗaya, irin waɗannan samfuran samfuran ƙarancin ƙarfi ne inda samfurin zai ƙunshi isassun ƙarfin wutar lantarki mai ƙarfi don kula da VDD vol.tage. A al'ada voltage ba zai sauke zuwa 0V a cikin fiye da 10 seconds. Duk da haka da yake wannan shine jinkirin tsarin saukar da wutar lantarki, akwai babban yuwuwar cewa VDD voltage na iya faɗuwa zuwa ƙimar ƙasa da na LVR voltage, wanda zai sa MCU ta haifar da sake saitin LVR. Bayan an shigar da sabon baturi, VDD voltage zai zama mafi girma fiye da LVR voltage, kuma tsarin zai dawo kuma ya ci gaba da aiki na yau da kullum.

Amfani da LVR da LVD a cikin Idle/SLEEP Yanayin
Lokacin da tsarin ya shiga yanayin IDLE/ SLEEP, LVR ba ta da tasiri, don haka LVR ba zai iya sake saita tsarin ba, ko da yake ba zai cinye wuta ba. Lokacin da MCU ta shiga Yanayin BARCI, aikin LVD za a kashe ta atomatik. A wasu bayanai dalla-dalla akwai Yanayin BARCI guda biyu, BARCI da BARCI0. Ɗauki HT1F66 don misaliample, kafin shigar da Yanayin SLEEP0, aikin LVD dole ne a kashe ta hanyar share bit LVDEN a cikin rajistar LVDC zuwa 0. Aikin LVD zai ci gaba da aiki yayin shigar da Yanayin SLEEP1. Koma zuwa takardar bayanan don takamaiman cikakkun bayanai na MCU.
Za a sami takamaiman adadin ƙaramar wutar lantarki lokacin da aka kunna aikin LVD. Don haka, a cikin aikace-aikacen baturi waɗanda ke buƙatar rage yawan amfani da wutar lantarki, yana da mahimmanci a yi la’akari da yawan wutar lantarki na aikin LVD lokacin da tsarin ya shiga kowane yanayin ceton wutar, ko dai SLEEP ko Idle Modes.

Sauran Bayanan kula 

• Idan duka ayyukan LVR da LVD suna kunna kuma ana son cewa voltage saituna zasu daidaita, sannan lura cewa LVD voltage yakamata a saita zuwa ƙima sama da LVR voltage.
• LVD voltage saitin ya bambanta da buƙatun samfur daban-daban. Idan an saita shi azaman 2.2V don example, sannan LVD voltage na kowane aikace-aikacen zai bambanta da kusan 2.2V ± 5%. Ya kamata a bincika ƙayyadaddun ƙayyadaddun mutum a hankali a gaba.
• Ma'aunin lokacin tLVR na VLVR zai bambanta saboda matakai daban-daban. Don cikakkun tebur na ma'auni na DC/AC koma zuwa bayanan bayanai.
• Bayan LVR ya faru, lokacin da VDD voltage> 0.9V, ƙimar Ƙwaƙwalwar Bayanai ba za ta canza ba. Lokacin da VDD voltage ya fi LVR girma kuma, tsarin zai sake farawa aiki ba tare da buƙatar adana sigogin RAM ba. Duk da haka idan VDD ya kasance ƙasa da 0.9V, tsarin ba zai kiyaye ƙimar Ƙwaƙwalwar Data ba kuma a cikin wane hali lokacin da VDD vol.tage ya sake sama da LVR voltage, Za a aiwatar da Sake saitin Wuta akan tsarin.
• Ayyukan LVR da voltagAna aiwatar da zaɓin wasu MCUs daga zaɓuɓɓukan daidaitawa a cikin HT-IDE3000. Da zarar an zaɓa, ba za a iya canza su ta amfani da software ba.

Kammalawa

Wannan bayanin kula na aikace-aikacen ya gabatar da ayyukan LVD da LVR da aka bayar a cikin Holtek 8-bit Flash MCUs. Lokacin amfani da shi daidai, LVD da ayyukan LVR na iya rage aikin MCU mara kyau lokacin da ƙarfin wutar lantarki.tage ba shi da kwanciyar hankali, don haka yana haɓaka daidaiton samfur. Bugu da ƙari, an taƙaita wasu bayanan kula da hanyoyin amfani da LVD da LVR don taimakawa masu amfani don amfani da LVD da LVR cikin sassauƙa.

Siffofin da Bayanin Gyarawa

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Takardu / Albarkatu

HOLTEK HT8 MCU LVD LVR Dokokin Aikace-aikacen [pdf] Umarni HT8, MCU LVD LVR Dokokin Aikace-aikacen, Sharuɗɗan Aikace-aikace, HT8, MCU LVD LVR

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