TMR1 100Hz Exactly Interrupt Routine

[paul borgmeier]

>>I was thinking of shutting it down while im waiting to save power

I am guessing you are referring to the LM34/35 and not the Pic? If so, I am sure it is in the datasheet. If you are planning to run off of batteries, then the lower XTAL speed would be ideal for the PIC

A free runing TMR1 will overflow every 8 seconds (prescaler = 1) with a 32768 XTAL. You could count 15 overflows for 2 minutes.

Or you cold poll TMR0, also free running (prescaler = 256) with a 32768 XTAL. You could count 15 overflows for 2 minutes. The link I gave you has an example of polling TMRO.

Too many options - also check the LM34/35 datasheet and see what it needs in the way of communication speeds, etc. I have not looked for some time and do not recall the method.

There have been a zillion questions in this forum about the LM34/35 over the years - search and you shall be rewarded.

[manumenzella]

Hi. Thanks for your help.
Yes, as you said, it would be ideal the low frequency crystal, and the timing is also much simpler LOL.
The LM35 outputs a linear 10 mV/`C and the LM34 is 10 mV/`F
Anyway, that wouldnt be a problem with speed, but will I be able to interface an I2C EEPROM like 24LM32 with that speed??? I guess yes because its syhncronus transmission, but i ask to be sure
Thanks a lot
Manuel