Interfacing BS2px with M48T08 clock/calendar?

jcpole

Hi all...

I just found a bunch of these chips in a grab bag, and I was curious as to whether or not they can be interfaced with a BS2px. It is supposed to be compatible with the DS1643.

I've done quite a few different searches to try to find more information, but all I could really find was a datasheet (which I have attached).

Any assistance would be appreciated...

Jamie

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Jamie C. Pole
Principal Consultant
J.C. Pole & Associates, Inc.
http://www.jcpa.com/

PJAllen

Sure, it's possible.· It's just that they are parallel-in, parallel-out RAMclocks.· It won't be anywhere near as easy as interfacing with I2C, given that you have that capability with your PX.

jcpole

Yeah, that's pretty much what I had figured. I've become spoiled by not having to use 8 pins for datacomm... Do you think it's possible to interface with this through an I2C parallel-to-serial converter?

Jamie

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Jamie C. Pole
Principal Consultant
J.C. Pole & Associates, Inc.
http://www.jcpa.com/

PJAllen

· Guess you'll need an I2C parallel-to-serial converter, too.
· You could use shift registers (PISO and SIPO).
· If you're talented and adroit (we need more droits!) and can spare the I/Os, then·the inputs could be paralleled and the outputs SHIFTed (or vice versa.)
· Another thing is you have to tell them to turn on/off the internal battery (you need an "orderly shut-down" sequence, no bailing out without saying 'good night'.)

jcpole

I'm trying to interface to it with 74HC164's and 74HC165's - looks promising so far...

Jamie

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--
Jamie C. Pole
Principal Consultant
J.C. Pole & Associates, Inc.
http://www.jcpa.com/