DT Elapsed Timer Question

[richard]

so is it likely to expect the elapsed timer to corrupt some of this processing or acquisition?

not really , i2c command is software timed but a synchronous process so not overly disturbed if pic is master.
eprom write command disables interrupts anyway so unaffected.
adc should be ok too conversion is done in hardware, acquisition time may be affected but not in a bad way [aq time is a minimum EXTRA WON'T HURT]
edit , I should qualify that statement with "unless you are doing some advanced sampling eg .like a fft "

its a trade off for elapsed timer accuracy with async processes worst affected