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'Interfacing a 3x4 keyboard to the 16C84'
1997\06\30@091741 by Cesare Lavazza

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I need to interface a 12 key matrix keyboard to the 16C84: which is the
best way to do this?
Thanks.

Bye.
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Email:  spam_OUTiw2kpuTakeThisOuTspamradionostalgia.net
WWW:   http://radionostalgia.net/Users/Lavazza

1997\06\30@133044 by Ravindra Divekar

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if you see  the book by Douglas Hall
(i think its called microprocessors: interfacing hw &sw>
you'll get the schematic. of course he uses a 8088, but the
idea is the same.
if you use a row-column approach, you can even
interface 16 keys using 8 I/O pins.
see the on-linedata sheets for 12C508 also.
they have some info too.




> I need to interface a 12 key matrix keyboard to the 16C84: which is the
> best way to do this?
> Thanks.
>
> Bye.
> ----------------------------------------------
> Email:  .....iw2kpuKILLspamspam@spam@radionostalgia.net
> WWW:   http://radionostalgia.net/Users/Lavazza
>

1997\06\30@170023 by Steve Smith

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See the application note in the ECH about the LED clock. cant remember the
note number now ECH at work mail me if u want more info.....

Steve.....

1997\06\30@191404 by ns

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I had to use one of those keypads once.  I was also driving three four
phase stepper motors at the same time from an 84.  To save pins I used a
74ls138 on porta, three of its ouputs went to the rows of the keypad, and
the 4 data bits it produced went to portb. Portb b has pull-ups and the
74ls138 has low outputs so pressing a key brought the pull-ups low, which
was very convenient.  Also i had 5 other outputs on the 74ls138 which i
used to drive 5 seven seg displays and the three stepper motors (using
latches of course).

On Mon, 30 Jun 1997, Cesare Lavazza wrote:

> I need to interface a 12 key matrix keyboard to the 16C84: which is the
> best way to do this?
> Thanks.
>
> Bye.
> ----------------------------------------------
> Email:  iw2kpuspamKILLspamradionostalgia.net
> WWW:   http://radionostalgia.net/Users/Lavazza
>

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