HT67F488 datasheet(43/171 Pages) HOLTEK

43 / 171 page

Rev. 1.60

�ove��e� �� 016

HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

IDLE1 Mode

TheIDLE1ModeisenteredwhenaHALTinstructionisexecutedandwhentheIDLENbitinthe

SMODregisterishighandtheFSYSONbitintheCTRLregisterishigh.IntheIDLE1Modethe

systemoscillatorwillbeinhibitedfromdrivingtheCPU,thesystemoscillatorwillcontinuetorun,

andthissystemoscillatormaybehighspeedorlowspeedsystemoscillator.IntheIDLE1Modethe

lowfrequencyclockfSUBwillbeon.

Note:IfLVDEN=1andtheSLEEPorIDLEmodeisentered,theLVDandbandgapfunctions

willnotbedisabled,andthefSUBclockwillbeforcedtobeenabled.Insleepmode,other

peripheralwilldisableexceptWDT,LVDifenableinSLEEP1.

Control Register

Asingleregister,SMOD,isusedforoverallcontroloftheinternalclockswithinthedevice.

SMOD Register

Bit

�a�e

CKS�

CKS1

CKS0

—

LTO

HTO

IDLE�

HLCLK

R/W

—

R/W

POR

—

Bit7~5

CKS2~CKS0:ThesystemclockselectionwhenHLCLKis“0”

000:fSUB(fLXTorfLIRC)

001:fSUB(fLXTorfLIRC)

010:fH/64

011:fH/32

100:fH/16

101:fH/8

110:fH/4

111:fH/2

Thesethreebitsareusedtoselectwhichclockisusedasthesystemclocksource.In

additiontothesystemclocksource,whichcanbeeithertheLXTorLIRC,adivided

versionofthehighspeedsystemoscillatorcanalsobechosenasthesystemclock

source.

Bit4

Unimplemented,readas“0”

Bit3

LTO:Lowspeedsystemoscillatorreadyflag

0:Notready

1:Ready

Thisisthelowspeedsystemoscillatorreadyflagwhichindicateswhenthelowspeed

systemoscillatorisstableafterpoweronresetorawake-uphasoccurred.Theflag

willbelowwhenintheSLEEP0Modebutafterawake-uphasoccurred,theflagwill

changetoahighlevelafter1024clockcyclesiftheLXToscillatorisusedand1~2

clockcyclesiftheLIRCoscillatorisused.

Bit2

HTO:Highspeedsystemoscillatorreadyflag

0:Notready

1:Ready

Thisisthehighspeedsystemoscillatorreadyflagwhichindicateswhenthehighspeed

systemoscillatorisstable.Thisflagisclearedto“0”byhardwarewhenthedeviceis

poweredonandthenchangestoahighlevelafterthehighspeedsystemoscillatoris

stable.

Thereforethisflagwillalwaysbereadas“1”bytheapplicationprogramafterdevice

power-on.TheflagwillbelowwhenintheSLEEPorIDLE0Modebutafterawake-

uphasoccurred,theflagwillchangetoahighlevelafter15~16clockcyclesifthe

HIRC/HXToscillatorisused.

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