I've had a 6502 chip in my "projects box" for some time; it's an R65C02P3, which I believe is the Rockwell CMOS version of the 6502. I was wondering if anyone had a data sheet or other specs on this chip. I'm hoping to use it in a microcontroller project. Fortunately, I'm familiar with 6502 machine language programming (since I have been a proud Commodore owner), but I'd like to check out the maximum clock frequency and any other peculiarities of this particular chip. Thanks for any help.

Consider it the same thing as the GTE/CMD 65c02, except that it has the direct bit-manipulating and bit-testing ZP instructions. Go to http://www.6502.org/documents/datasheets/cmd/ and click on the first part number to download the data sheet. The "P3" means plastic DIP, 3MHz, but it will certainly run faster than that if the memory and glue logic is fast enough-- maybe 5Mhz. The CMOS part has more instructions and addressing modes than the old NMOS one you seem to be familiar with, better bus-driving capability, you can have the clock oscillator on-board, it takes a fraction as much power, and the bugs are fixed. You can see the direct bit operations on the data sheet for the WDC 65c02 or their excellent programming manual which you can download at their website, www.westerndesigncenter.com, just above the lower-right corner of their front page. (I should mention, for those who read this much later, that WDC changes their website often, so the programming manual won't necessarily always be in the same place.)

Mike, I thought we got the Rockwell 65c02 up, but I don't see it.

Thanks Garth! That's very helpful information and much appreciated.

Try www.datasheetarchive.com with '65c02' or just '6502'. You should find then exactly the R65c02 datasheet.

Hi,

The datasheets for the Rockwell CMOS parts have been added. Datasheets are now available for the R65C02/102/112, R65C19, R65C21, R65C52:
http://www.6502.org/documents/datasheets/rockwell

Also, there is an application note called "The CMOS 6502" that may be of interest:
http://www.6502.org/documents/appnotes

Regards,
Mike

_________________
- Mike Naberezny (mike@naberezny.com) http://6502.org

Thanks Mike!!! The documents are exactly what I was looking for!

Credit should also be given to Garth Wilson, who was the original source for these documents. Thanks, Garth.

Regards,
Mike

_________________
- Mike Naberezny (mike@naberezny.com) http://6502.org