Can PIC16F84 replaced by PIC16F877A with the same configurations in PIC16F84?? - Electronic Circuits Projects Diagrams Free

chunei · 3rd September 2007, 05:42 PM

Can PIC16F84 replaced by PIC16F877A with the same configurations in PIC16F84??

The difference is 84 has less pins than the 877A...
84 has Flash EEPROM and 877A has Flash as well..

so can the 84 replaced by 877A?

Hank Fletcher · 3rd September 2007, 06:02 PM

What do you mean by configurations?

Like you said, the 16F84 has less pins than the 16F877A, so it's not a match in physical size, i.e. not a drop-in replacement part. The most direct, current production replacement part for the 16F84 is the 16F88 (identical pin-count and a few more features).

The 16F877A is a more powerful chip than the 16F84, so anything you might have done with the 16F84 you could do instead with the 16F877A.

chunei · 3rd September 2007, 06:24 PM

I mean like in terms of the connection??? as the 877A has more pins then can I juz replace it with the same port connection as the f84?

ericgibbs · 3rd September 2007, 06:38 PM

Quote:

Originally Posted by chunei

I mean like in terms of the connection??? as the 877A has more pins then can I juz replace it with the same port connection as the f84?

hi,
Are you asking if you can use the same program and CONFIG WORD thats written for the F84 in a F877A?

Hank Fletcher · 3rd September 2007, 06:56 PM

Quote:

I mean like in terms of the connection??? as the 877A has more pins then can I juz replace it with the same port connection as the f84?

I think he's asking if he can, for instance, interchange the PORTB.3 pin on the 16F84 with whatever the PORTB.3 pin might be on the 16F877A? I'm guessing yes if he's only interested in TTL I/O. As long as the same port pin on both PICs has the same function (which more often than not, they do) then there shouldn't be a problem. Check the datasheets for both PICs and make sure the pin functions of the 16F84 match up with the equivalent port pins on the 16F877A. I'm guessing it will be close if not the same, with the exception of there being more function options (like CCP) for some pins on the 16F877A.

blueroomelectronics · 3rd September 2007, 07:34 PM

The source files would have to be modified but could be very close.
You have to turn off the A/D and comparators for starters.

**Nigel Goodwin** · 3rd September 2007, 10:57 PM

They both use the same 14 bit core, so it's VERY simple to convert antique F84 code to F877 code - the changes required are VERY minor.

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3rd September 2007, 05:42 PM	#1
chunei	Can PIC16F84 replaced by PIC16F877A with the same configurations in PIC16F84?? Can PIC16F84 replaced by PIC16F877A with the same configurations in PIC16F84?? The difference is 84 has less pins than the 877A... 84 has Flash EEPROM and 877A has Flash as well.. so can the 84 replaced by 877A?

3rd September 2007, 06:02 PM	#2
Hank Fletcher	What do you mean by configurations? Like you said, the 16F84 has less pins than the 16F877A, so it's not a match in physical size, i.e. not a drop-in replacement part. The most direct, current production replacement part for the 16F84 is the 16F88 (identical pin-count and a few more features). The 16F877A is a more powerful chip than the 16F84, so anything you might have done with the 16F84 you could do instead with the 16F877A.

3rd September 2007, 06:24 PM	#3
chunei	I mean like in terms of the connection??? as the 877A has more pins then can I juz replace it with the same port connection as the f84?

3rd September 2007, 07:34 PM	#6
blueroomelectronics	The source files would have to be modified but could be very close. You have to turn off the A/D and comparators for starters. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

3rd September 2007, 10:57 PM	#7
Nigel Goodwin	They both use the same 14 bit core, so it's VERY simple to convert antique F84 code to F877 code - the changes required are VERY minor. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk