Comparator - Electronic Circuits Projects Diagrams Free

YAN-1 · 26th June 2005, 10:30 AM

Hi. I was trying to choose between the 16F877 and the 16F877A. I just don't understand the comparator additional feature in the 16F877A. Doesn't the 16F877 have a CCP module (that includes a comparator). thanks

**Jay.slovak** · 26th June 2005, 10:41 AM

Quote:

Originally Posted by YAN-1

Hi. I was trying to choose between the 16F877 and the 16F877A. I just don't understand the comparator additional feature in the 16F877A. Doesn't the 16F877 have a CCP module (that includes a comparator). thanks

This is A's Additional function (Analog Comparator - mostly it's not used). If you are designing new project, head to A version!

YAN-1 · 26th June 2005, 10:47 AM

I'm sorry but I'm not sure I get this. If I want to compare 2 analog voltages, can't I use the CCP module in the 16F877?

**Jay.slovak** · 26th June 2005, 10:51 AM

Quote:

Originally Posted by YAN-1

I'm sorry but I'm not sure I get this. If I want to compare 2 analog voltages, can't I use the CCP module in the 16F877?

NO! CCP is Working with Digital Values!

YAN-1 · 26th June 2005, 10:55 AM

Oh I see

ops:. I feel stupid!
But if I use the comparator module of the 16F877A, can I still use the A/D module in the same PIC? I am asking because they both seem to use RA2 and RA3 as their references. Thanks.

**Jay.slovak** · 26th June 2005, 11:06 AM

Quote:

Originally Posted by YAN-1

Oh I see

ops:. I feel stupid!
But if I use the comparator module of the 16F877A, can I still use the A/D module in the same PIC? I am asking because they both seem to use RA2 and RA3 as their references. Thanks.

You can use both A/D and Comparators at once. A/D will give you Absolute value and Comparator will just signalise which one is greater...

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26th June 2005, 10:30 AM	#1
YAN-1	Comparator Hi. I was trying to choose between the 16F877 and the 16F877A. I just don't understand the comparator additional feature in the 16F877A. Doesn't the 16F877 have a CCP module (that includes a comparator). thanks

26th June 2005, 10:47 AM	#3
YAN-1	I'm sorry but I'm not sure I get this. If I want to compare 2 analog voltages, can't I use the CCP module in the 16F877?

26th June 2005, 10:55 AM	#5
YAN-1	Oh I see ops:. I feel stupid! But if I use the comparator module of the 16F877A, can I still use the A/D module in the same PIC? I am asking because they both seem to use RA2 and RA3 as their references. Thanks.