Subject:
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IC question
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 13 Dec 1998 06:32:32 GMT
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Original-From:
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Victor Lee <LEETBVIC@SINGNETnospam.COM.SG>
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Viewed:
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1068 times
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Dear All,
I have a question on the operation of the Handy Board motor outputs
which i do not understand. As deduced from the schematic diagram, I believe that
the HC374 chip clock input is connected to a Y6 terminal. This Y6 terminal is
one of the outputs of a 74'138 decoder which will trigger when a value is poked
to the address 0x0e. Based on the diagram, I would expect Y6 to be active only
when A15 is low while A14, A13 and A12 are high, but this doesn't correspond to
the address 0x0e right? Am I wrong in interpreting A15 as the most significant
bit? Also, is the 0e (in hex) unique in IC only? I can't seem to figure why is
there a preceding 0.
Also, I am currently modifying the Handy Board to support more motor
outputs and is intending to tap Y0 terminal to a HC574 chip (clock input) on the
new board. What address should i poke to? Sorry, sounds trivial but didnt manage
to find any answers on the web.
Would appreciate help/advice of any kind. Thanks in advance.
Regards,
Victor
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Message has 1 Reply:
 | | Re: IC question
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| Dear Victor, I'll give you a few hints about what you are trying to do. 1. the "0x" in front of 0x0e is the same as "$" in regular C. It just designates that the number following is in hex format. 2. Fred runs his motor driver chips using addresses (...) (25 years ago, 26-Jun-99, to lugnet.robotics.handyboard)
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