In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

I have the Dallas time/date chip, but I thought it might be useful to use up my SX-18s as time pieces.  

Now I see the dilemma is not just about sharing the clock cycles, but sustaining a good tic at low power.   Clocks must run 24/7 while the rest of the unit might be put into sleep mode.

The above Virtual Peripheral designated a 50mHz crytal [lots of milliamps drain].  Even the 32.768 would create a bit of a power drain, but at least the accuracy would increase quite a bit.

I will took a look at the PCF8583 and it is 50ma.  The Dallas Chip seems to come in at 2ma !!! WOW and micro amps in standby with an optional backup battery.

Of course there could be some occasions where having an SX be the clock could be a big advantage - a customized, shared format for waking up the main micro-processor.  

Also, if the SX is on an RS-485 network, one reliable clock could routinely reset all the others as a regular maintanance cycle.

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