HT66F005 datasheet(32/109 Pages) HOLTEK

32 / 109 page

Rev. 1.30

3�

��i� �� 01�

Rev. 1.30

��i� �� 01�

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

OS C1

OS C2

To i nt er nal

ci rc ui ts

In te rn al

O sci lla to r

Ci rc ui t

No te :1 . Rp i s nor ma lly not r equi r ed. C 1 and C2 a re r equ ir ed.

2. A lt hough not s how n OS C1 /O SC 2 pi ns h av e a pa ra si ti c

c apac it an ce o f a r ound 7pF .

Crystal/Resonator Oscillator – HXT

Crystal Oscillator C1 and C2 Values

Crystal Frequency

1�MHz

0�F

8MHz

0�F

4MHz

0�F

1MHz

100�F

Note: C1 and C� va�ues a�e fo� guidance on�y.

Crystal Recommended Capacitor Values

High Speed Internal RC Oscillator – HIRC

TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents.

TheinternalRCoscillatorhasthreefixedfrequenciesofeither4MHz,8MHzor12MHz.Device

trimmingduringthemanufacturingprocessandtheinclusionofinternalfrequencycompensation

circuitsareusedtoensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocess

variationsontheoscillationfrequencyareminimised.Notethatifthisinternalsystemclockoption

isselectedasthehighspeedoscillator,asitrequiresnoexternalpinsforitsoperation,I/OpinsPA6

andPA5canonlybeusedasnormalI/Opins.

Internal 32kHz Oscillator – LIRC

TheInternal32kHzSystemOscillatoristhelowfrequencyoscillator.Itisafullyintegrated

RCoscillatorwithatypicalfrequencyof32kHzat5V,requiringnoexternalcomponentsforits

implementation.Devicetrimmingduringthemanufacturingprocessandtheinclusionofinternal

frequencycompensationcircuitsareusedtoensurethattheinfluenceofthepowersupplyvoltage,

temperatureandprocessvariationsontheoscillationfrequencyareminimised.

Supplementary Oscillator

Thelowspeedoscillator,inadditiontoprovidingasystemclocksourceisalsousedtoprovide

aclocksourcetotwootherdevicefunctions.ThesearetheWatchdogTimerandtheTimeBase

Interrupts.

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