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Microcontroller Nco tshuab

Mar 08, 2019

Ob hom kev nco yog feem ntau siv cov microcontrollers, ib lub cim xeeb uas tsis muaj lub cim cia rau kev khaws cia firmware thiab nyeem ntawv-sau ntawv rau cov ntaub ntawv ib ntus.


Cov ntaub ntawv

Ntawm qhov microcontrollers ntxov tshaj plaws rau hnub no, rau-transistor SRAM yuav luag txhua zaus siv raws li nyeem ntawv / sau ntawv ua haujlwm, nrog ob peb ntau transistors ib ntsis siv rau hauv cov ntaub ntawv rau npe. FRAM los sis MRAM yuav muaj peev xwm hloov nws li 4 mus rau 10 npaug denser uas yuav ua rau nws raug nqi ntau dua.


Ntxiv nrog rau SRAM, qee cov microcontrollers kuj muaj EEPROM nrog rau cov ntaub ntawv cia; thiab txawm tias cov tsis muaj qhov twg (lossis tsis txaus) feem ntau txuas nrog lwm tus EEPROM chip (xws li BASIC Stamp) los yog sab nraud serial flash memory nti.


Ob peb tsis ntev los no [thaum?] Microcontrollers pib thaum 2003 muaj "self-programmable" flash nco. [5]


Firmware

Cov earliest microcontrollers siv daim npog ROM kom muab firmware. Tom qab cov tshuab ua ntej (Freescale 68HC11 thiab Early PIC microcontrollers) muaj EPROM nco, uas siv ib lub qhov muag ntawm lub qhov muag kom pom ntawm UV lub teeb, thaum tsim cov ntawv tsis muaj qhov rais, tsis yog OTP (ib zaug-yog kev pabcuam) . Firmware tshiab tau sib npaug los hloov qhov microcontroller nws tus kheej, yog li muaj ntau yam khoom tsis tau upgradeable.


Motorola MC68HC805 [4] yog tus thawj microcontroller siv EEPROM los khaws cov firmware. EEPROM microcontrollers ua ntau nrov nyob rau xyoo 1993 thaum Microchip ua tswvcuab PIC16C84 [3] thiab Atmel nkag mus rau hauv 8051-microcontroller uas yog thawj zaug siv NOR Flash nco los tso cov firmware [5] Hnub no lub microcontrollers yuav luag tshwj xeeb tshaj yog siv flash nco, nrog rau ob peb ua qauv siv FRAM, thiab qee qhov tseem ceeb uas siv cov OTP lossis daim npog-ROM.