Dennis Plunkett wrote:
> 
> At 07:02 17/05/99 +0200, you wrote:
> >Leo TImmer wrote:
> >>
> >> Philips offers the PCF8553 clock/calendar with 240*8bit ram and the PCF8593
> >> low power version with 8byte ram. Try
> >> http://www-us.semiconductors.philips.com/
> >> Leo
> >
> >It is a nice chip, but watch out - if you inadvertantly
> >write '11' to the setup bits, you're screwed. '11' Puts
> >the chip into a test mode, and you have to power-cycle
> >it to get it to recover. This 'feature' is pretty
> >dangerous if you have a volume application.

> Hey, Tjaart; why should there be a difference between a one off application
> and a "Volume" application in this case?
> Nasty features like that can cause trouble at any point in time. Could be
> interesting if your micro has taken a long walk of a short pier into the
> inevitable bliss of electronic wonderland. There be no recovery for this
> one opps, no defensive code recovery eh?

Well, if you are watering your garden with it, you'll 
notice it soon enough (slop, slop). If you have an 
installed base of a few thousand or more, you had better 
get to the airport.... ;)

I have tried everything (software wise) to get it to 
recover, but it won't. Period. I have built-in checks 
at two different levels to prevent this from happening 
in my software.

-- 
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