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HT68F005 Datasheet(PDF) 30 Page - Holtek Semiconductor Inc |
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HT68F005 Datasheet(HTML) 30 Page - Holtek Semiconductor Inc |
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30 / 93 page  Rev. 1.00 30 ��to�e� ��� �01� Rev. 1.00 31 ��to�e� ��� �01� HT68F005/HT68F006 Enhanced I/O Flash Type MCU HT68F005/HT68F006 Enhanced I/O Flash Type MCU OS C1 OS C2 Rf To i nt er nal ci rc ui ts In te rn al O sci lla to r Ci rc ui t C1 C2 Rp 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 C1 C2 1�MHz 0pF 0pF 8MHz 0pF 0pF 4MHz 0pF 0pF 1MHz 100pF 100pF Note: C1 and C� values a�e fo� guidan�e only. 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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