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From: dvadura@watdaisy.UUCP (Dennis Vadura)
Newsgroups: net.micro.68k
Subject: Re: 68000 CPU clock cycles
Message-ID: <7671@watdaisy.UUCP>
Date: Thu, 20-Mar-86 20:39:33 EST
Article-I.D.: watdaisy.7671
Posted: Thu Mar 20 20:39:33 1986
Date-Received: Fri, 21-Mar-86 06:30:13 EST
References: <11637@watnot.UUCP>
Reply-To: dvadura@watdaisy.UUCP (Dennis Vadura)
Organization: Computer Science Dept., University of Waterloo
Lines: 22
Summary: 

In article <11637@watnot.UUCP> rwhilchie@watnot.UUCP () writes:
>Does anyone out there on the net have any information on the number of
>CPU cycles each instruction of the 68000 uses? I have the the books
>		MOVE.L	data32,Dn	12(3/0)
>		BCS	label		10,18(1/0)
>
>Does anyone know what the two numbers inside the parenthesis mean?

From the Motorola MC68000 users manual the numbers in parentheses indicate
the number of read and write cylcles (r/w) included in the cpu cycle count.
I imagine any book that you have took this information directly from the
manual and does match for the instructions you give.  Although the
count for BCS seems to be wrong for branch not taken my manual says it's
12 cycles instead of 18.


-- 
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Dennis Vadura, Computer Science Dept., University of Waterloo

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