Just a little doubt about this schematic (16F877)

-_nando-_ · 27th August 2006, 04:52 PM

Check out the PDF, I can't understand those thick lines, what they are, and how to connect it...

I'm talking about that line from pins 33, 34 and 35 that cross all the others connections on the right side of the PIC, and also goes to the right side of the ATAPI conector and there's the same thing in the LCD part too.

I know that it's newbie thing but...

Thanks !

Kind Regards,

Fernando

HFGuy · 27th August 2006, 05:03 PM

its the symbolic respresentation of a bus. Its cleaner to draw that then all the individual wires that make up the bus.

-_nando-_ · 27th August 2006, 05:11 PM

Hmmmm, but look at the bus link to the LCD. Should I wire it backwards?

HFGuy · 27th August 2006, 05:14 PM

just match up the pins

ck == ck
rw == rw
rs == rs
d0 == do
d1 == d1
....

Just out of curiosity what is this PIC project for ?? I havnt used a PIC myself but i have extensive experience with the MC68HC11.

-_nando-_ · 27th August 2006, 06:21 PM

Oh, how I didn't see it?? I was so happy because I've found this project that I was blind eheheheheh

This is a CDROM controller, to use any ordinary pc cdrom drive as audio cd player!

Kind Regards,

Fernando

Leolabs · 28th August 2006, 02:56 AM

Do you have the firmware??I have build a 89S52 base CDROM controller and I want to try a PIC based one.

clem_o · 28th August 2006, 03:37 AM

Would be nice to have a look at that firmware!

May have a problem finding '877s, as Microchip is pushing the 18 line now.

Having come from the HC11 as well, one may find that working with the assy language of the PIC is a pain. Also its need to bank-switch as it pages through program and variable memory (these are treated separately - the PIC is a Harvard processor).

Having said these things, the PICs are fairly inexpensive and do have a fair amount of processing power (i.e. 5MIPs with a 20MHz crystal), so they have a good balance of price to performance to 'user friendliness' (or the lack of it) that makes them fairly popular...

Cheers

Clem

mrjam · 28th August 2006, 06:50 AM

Quote:

May have a problem finding '877s, as Microchip is pushing the 18 line now.

The 18 line isn't replacing the 16 line.. it's a really important branch of Microchip production. '877 is still available, "A" version too.

http://www.microchip.com/stellent/id...cName=en010242

Quote:

I was so happy because I've found this project that I was blind eheheheheh

Nando ...you know a microcontroller is not a ready-to-use IC ..isn't it?

I feel you don't have any program code at all!

Let start a study session: buy a book about microcontrollers or download some tutorials and manuals you find in the web (there're so much!). Fun is guaranteed!

clem_o · 28th August 2006, 11:45 AM

Well, I do hope the '877 stays in production - it's getting scarce here, at least in retail form.

Cheers!

Clem

-_nando-_ · 28th August 2006, 12:08 PM

Quote:

Originally posted by mrjam

Nando ...you know a microcontroller is not a ready-to-use IC ..isn't it?

I feel you don't have any program code at all!

Let start a study session: buy a book about microcontrollers or download some tutorials and manuals you find in the web (there're so much!). Fun is guaranteed!

Heheheheeh, I know it !!

Here's the firmware

Cheers !

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27th August 2006, 05:03 PM	#2
HFGuy diyAudio Member Join Date: Sep 2004 Location: Toronto, Ontario	its the symbolic respresentation of a bus. Its cleaner to draw that then all the individual wires that make up the bus.

27th August 2006, 05:11 PM	#3
-_nando-_ diyAudio Member Join Date: Dec 2005 Location: Sao Paulo	Hmmmm, but look at the bus link to the LCD. Should I wire it backwards?

27th August 2006, 05:14 PM	#4
HFGuy diyAudio Member Join Date: Sep 2004 Location: Toronto, Ontario	just match up the pins ck == ck rw == rw rs == rs d0 == do d1 == d1 .... Just out of curiosity what is this PIC project for ?? I havnt used a PIC myself but i have extensive experience with the MC68HC11.

27th August 2006, 06:21 PM	#5
-_nando-_ diyAudio Member Join Date: Dec 2005 Location: Sao Paulo	Oh, how I didn't see it?? I was so happy because I've found this project that I was blind eheheheheh This is a CDROM controller, to use any ordinary pc cdrom drive as audio cd player! Kind Regards, Fernando

28th August 2006, 02:56 AM	#6
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Do you have the firmware??I have build a 89S52 base CDROM controller and I want to try a PIC based one.

28th August 2006, 03:37 AM	#7
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Would be nice to have a look at that firmware! May have a problem finding '877s, as Microchip is pushing the 18 line now. Having come from the HC11 as well, one may find that working with the assy language of the PIC is a pain. Also its need to bank-switch as it pages through program and variable memory (these are treated separately - the PIC is a Harvard processor). Having said these things, the PICs are fairly inexpensive and do have a fair amount of processing power (i.e. 5MIPs with a 20MHz crystal), so they have a good balance of price to performance to 'user friendliness' (or the lack of it) that makes them fairly popular... Cheers Clem

28th August 2006, 11:45 AM	#9
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Well, I do hope the '877 stays in production - it's getting scarce here, at least in retail form. Cheers! Clem

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