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HT83B60 Datasheet(PDF) 33 Page - Holtek Semiconductor Inc |
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HT83B60 Datasheet(HTML) 33 Page - Holtek Semiconductor Inc |
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33 / 84 page  Rev. 1.00 3� De�e��e� 1�� �011 Rev. 1.00 33 De�e��e� 1�� �011 HT83B60 Voice Mask MCU HT83B60 Voice Mask MCU Time Base TheTimeBasefunctionwillgeneratearegularinterruptsignalsynchronisedtothesystemclock whichcanbeusedbytheapplicationasatimebasesignal. Time Base Operation TheTimeBaseoperationisaverysimplefunctionforthegenerationofaregulartimesignal.This isimplementedbygeneratingaregularinterruptsignalwhoseenable/disabledandrequestflagsare intheINTCregister.TheclocksourceforthetimebaseistheinternalfSYS/4clocksource,which isthendividedinternallybyavalueof1024.Itisthisdividedsignalthatgeneratestheinternal interrupt.TheTimeBaseInterruptisenabledbytheETBIbitintheINTCregisterandinterrupt requestflagistheTBFflaginthesameregister.Atimebaseof1mswillthereforbegeneratedfrom asystemclockof4MHzandatimebaseof0.5mswillbegeneratedfromasystemclocksourceof 8MHz. ¸ 1024 S yst em C lo ck/ 4 Ov er fl ow to I nt er ru pt Time Base Example Thefollowingexampleprogramsectionisbasedonthedevice.TheprogramshowshowtheTime Baseregistersaresetupalongwithhowtheinterruptsareenabledandmanaged.Thepointstonote intheexamplearehowtheTimeBaseisturnedonbysettingbit4oftheINTCregister.TheTime Basecanbeturnedoffinasimilarwaybyclearingthesamebit.Thisexampleprogramsetsthe TimeBasewhichusestheinternalsystemclockastheirclocksource,andproducesatimebase interruptevery0.5msfromasystemsourceclockof8MHz. #include HT83B60.inc jmp begin : org 04h ; time base vector jmp time_base_int;jumpherewhentimebaseoverflowsper0.5ms org 08h reti org 0Ch reti org 10h reti org 14h reti : ; time base interrupt routine time_base_int: : ; time base main program placed here : reti : begin: ; setup interrupt register mov a,03h ; enable global and time base interrupt mov intc,a ; enable time base |
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