ETIC 2230 Guia do Utilizador descarregar pdf (Página 37)

Rev. 1.10 36 November 14, 2014 Rev. 1.10 37 November 14, 2014

HT66FW2230

Wireless Charger A/D Flash 8-Bit MCU

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NORMAL Mode to SLOW Mode Switching

WhenrunningintheNORMALMode,whichusesthehighspeedsystemoscillator,andtherefore

consumesmorepower,thesystemclockcanswitchtorunintheSLOWModebysetthe

CKS2~CKS0bitsto“111”intheSCCregister.Thiswillthenusethelowspeedsystemoscillator

whichwillconsumelesspower.Usersmaydecidetodothisforcertainoperationswhichdonot

requirehighperformanceandcansubsequentlyreducepowerconsumption.

TheSLOWModeissourcedfromtheLIRCoscillatorandthereforerequiresthisoscillatortobe

stablebeforefullmodeswitchingoccurs.

SLOW Mode to NORMAL Mode Switching

InSLOWmodethesystemclockisfromf

SUB

.WhensystemclockisswitchedbacktotheNORMAL

modefromf

SUB

,theCKS2~CKS0bitsshouldbesetto“000”~“110”andthenthesystemclockwill

respectivelybeswitchedtof

~f

/64.

However,iff

isnotusedinSLOWmode,itwilltakesometimetore-oscillateandstabilise.Thisis

monitoredusingtheHXTF/HIRCFbitintheHXTC/HIRCCregister.Theamountoftimerequired

forhighspeedsystemoscillatorstabilizationdependsuponwhichhighspeedsystemoscillatortype

isused.

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