Fwd: Slightly OT: Up/Down-Counter, easy interfaceable to 8-bit MPU

From: MagerValp (MagerValp_at_cling.gu.se)
Date: 2004-04-30 13:05:05

Spiro, I think you got unsubscribed due to a full mailbox.

Date: Fri, 30 Apr 2004 11:41:34 +0200
From: Spiro Trikaliotis <trik-news@gmx.de>
To: cbm-hackers ML <cbm-hackers@cling.gu.se>
Subject: Slightly OT: Up/Down-Counter, easy interfaceable to 8-bit MPU
Message-ID: <20040430094134.GA31095@mail>


I know, this is slightly OT, but as I found many knowledgable people
here and it *could* be used for a CBM hardware project, I thought I
might try to ask anyway.

At work, we need two 16-bit (binary) counters which can count up and
down, depending on the state of a direction bit ; that is, something
similar to a 4510 or 4192, but with 16 bit. One or two chip select pins
changing the data bits from tri-state to "driving" would help, too.

Something like a 6522 or 6526, but with up/down counter instead of
timers, would be exactly what we want.

All chips I found so far are either much less than 16 bit (12 or 14 bit
might be enough, but not less), or only count in one direction.

I found http://www.atmel.com/acrobat/doc0465.pdf which describes how to
build something like that with an FPGA. Anyway, I ask myself if there is
nothing "ready to use" available?

Kind regards,

Spiro R. Trikaliotis

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