User`s guide

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
H
~f
H
/64.
However,iff
H
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.