HT66F005 datasheet(33/109 Pages) HOLTEK

33 / 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

Operating Modes and System Clocks

Presentdayapplicationsrequirethattheirmicrocontrollershavehighperformancebutoftenstill

demandthattheyconsumeaslittlepoweraspossible,conflictingrequirementsthatareespecially

trueinbatterypoweredportableapplications.Thefastclocksrequiredforhighperformancewill

bytheirnatureincreasecurrentconsumptionandofcourseviceversa,lowerspeedclocksreduce

currentconsumption.AsHoltekhasprovidedthesedeviceswithbothhighandlowspeedclock

sourcesandthemeanstoswitchbetweenthemdynamically,theusercanoptimisetheoperationof

theirmicrocontrollertoachievethebestperformance/powerratio.

System Clocks

ThedeviceshavemanydifferentclocksourcesforboththeCPUandperipheralfunctionoperation.

Byprovidingtheuserwithawiderangeofclockoptionsusingconfigurationoptionsandregister

programming,aclocksystemcanbeconfiguredtoobtainmaximumapplicationperformance.

Themainsystemclock,cancomefromeitherahighfrequency,fH,orlowfrequency,fL,source,and

isselectedusingtheHLCLKbitandCKS2~CKS0bitsintheSMODregister.Thehighspeedsystem

clockcanbesourcedfromeitheranHXTorHIRCoscillator,selectedviaaconfigurationoption.

ThelowspeedsystemclocksourcecanbesourcedfrominternalclockfL.IfthefLisselected,itcan

besourcedbytheLIRCoscillator.Theotherchoice,whichisadividedversionofthehighspeed

systemoscillatorhasarangeoffH/2~fH/64.

TB CK

Ti me B as e 0

WD T

HX T

HI RC

LI RC

Hi gh S peed O sc illa ti on s

Lo w Sp eed Os ci ll at io n

f H

Hi gh S peed O sc illa ti on

Co nf ig u ra ti on O pt io n

f H /6 4

f H /3 2

f H /1 6

f H /8

f H /4

f H /2

6- st age Pr e sca le r

f LI RC

f SYS

HL CL K,

CK S2 ~C KS 0 bi ts

Fa s t W ak e- up fr om S LE EP M ode or

ID LE M ode Co nt ro l (f or H XT o nl y)

f SYS /4

f TB

f L

Ti me B as e 1

f SU B

System Clock Configurations

Note:WhenthesystemclocksourcefSYSisswitchedtofLfromfH,thehighspeedoscillationwill

stoptoconservethepower.ThusthereisnofH~fH/64forperipheralcircuitstouse.

HT66F005 датащи(PDF) 33 Page - Holtek Semiconductor Inc

HT66F005 датащи(HTML) 33 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL