Subject:
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Re: HB Memory map
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 14 Jun 2000 11:06:48 GMT
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Original-From:
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Stephan Adelsberger <ASTEPHAN@DEC1.spamlessWI-INF.UNI-ESSEN.DE>
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Viewed:
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942 times
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Device Location Notes
=====================================
6811 internal $0000-$00ff Built-in
RAM (A1 chip)
$0000-$01ff
(E1 chip)
-----------------------------------------------------------
6811 control $1000-$103f Built-in
registers
-----------------------------------------------------------
Expansion I/O $4000-$4fff Memory reads in this range
enable the Y1 latch selector,
Bank 0 present on
the HB Expansion Bus. Memory writes in this
range
enable the Y0 selector on the Expansion Bus. No
devices
are present on a stock Handy Board.
-----------------------------------------------------------
Expansion I/O $5000-$5fff Reads enable Y3; writes
enable Y2. See explanation above.
Bank 1
-----------------------------------------------------------
Expansion I/O $6000-$6fff Reads enable Y5; writes
enable Y4. See explanation above
Bank 2
----------------------------------------------------------
Digital inputs $7000-$7fff The digital inputs consist
of the two switches and sensor ports
10 through
15. A memory read from anywhere in this range
returns the
value of the digital input byte.
---------------------------------------------------------
Motor outputs $7000-$7fff A memory write to anywhere in
this range controls the motor
outputs.
The low four bits are motor direction, and the high
four bits
are motor enable (1=on).
----------------------------------------------------------
External RAM $8000-$ffff The 32K of battery-backed
memory is mapped to the
upper 32K
block of the 6811 address space.
=====================================
-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~
Stephan Adelsberger stephan@adelsberger.com
http://go.to/robot
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Message is in Reply To:
 | | HB Memory map
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| This probably sounds like a pretty lame question but I am trying to make use of the unused areas in the lower 32K of the memory map of the HB but I can't seem to find the memory map in the documentation that I have available (the HB pdf manual, IC (...) (24 years ago, 12-Jun-00, to lugnet.robotics.handyboard)
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