Article View: comp.sys.amiga.tech
Article #424Re: 8520 (CIA) timers
From: John Lee
Date: Fri, 07 Jul 1989 23:59
Date: Fri, 07 Jul 1989 23:59
22 lines
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1538 bytes
In article <12524@well.UUCP> sjm@well.UUCP (Stephen Moehle) writes:
>I am using the 8520 chips to do some timing, and I am having one major problem.
>Nowhere can I find out what the period of time is that I am counting. I am
>using the "count 02 pulses" mode, whatever that means. That is the phrase
>used in the 1.1 Hardware Reference Manual. Could some one please tell me how
>many microseconds one of these timer ticks is? Thanks.
>
>Stephe
>{ucbvax,pacbell,hplabs}!well!sjm or sjm@well.sf.ca.usa
>"You heard the weirdo man. What is truth?"
Sure. The phase-2 clock is roughly 718 KHz, so each of the 8520 "ticks"
or phase-2 pulse has a period of 1 / 718 KHz or 1.39 microseconds.
--John
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<296@sed170.HAC.COM>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!uwvax!dogie.macc.wisc.edu!csd4.milw.wisc.edu!cs.utexas.edu!usc!hacgate!tcville!sed170!leeReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!uwvax!dogie.macc.wisc.edu!csd4.milw.wisc.edu!cs.utexas.edu!usc!hacgate!tcville!sed170!lee From: lee@sed170.HAC.COM (John Lee ) Newsgroups: comp.sys.amiga.tech Subject: Re: 8520 (CIA) timers Keywords: 8520 CIA timer Message-ID: <296@sed170.HAC.COM> Date: 7 Jul 89 23:59:21 GMT References: <12524@well.UUCP> Reply-To: lee@sed170.UUCP (John Lee (ird)) Organization: Hughes Aircraft Co., El Segundo, CA Lines: 22