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dcb · 05-23-2009, 09:18 PM

Here is the CPU and Crystal that come with the mpguino. It is pin compatible but some of the instructions/register names are a bit different than the mega8. I'm moving towards 20mhz too FYI, couple low level timing changes as you can imagine.

I don't think it will solve slow 32 bit math though, 32 bit math is handy, but slow, have to use it sparingly. I do a lot of it but only once every 1/2 second to update the display and just do basic addition in the interrupts.

$4.11 atmega168p
http://mouser.com/Search/ProductDeta...ATMEGA168-20PU

$0.57 20mhz small crystal
http://mouser.com/Search/ProductDeta...-FOXS200-20-LF

edit: did not see a divide assembler instruction for either the mega8 or 168. Both muls take 2 cycles

05-23-2009, 09:18 PM	#1372 (permalink)
dcb needs more cowbell Join Date: Feb 2008 Location: ÿ Posts: 5,038 pimp mobile - '81 suzuki gs 250 t 90 day: 96.29 mpg (US) schnitzel - '01 Volkswagen Golf TDI 90 day: 53.56 mpg (US) Thanks: 158 Thanked 269 Times in 212 Posts	Here is the CPU and Crystal that come with the mpguino. It is pin compatible but some of the instructions/register names are a bit different than the mega8. I'm moving towards 20mhz too FYI, couple low level timing changes as you can imagine. I don't think it will solve slow 32 bit math though, 32 bit math is handy, but slow, have to use it sparingly. I do a lot of it but only once every 1/2 second to update the display and just do basic addition in the interrupts. $4.11 atmega168p http://mouser.com/Search/ProductDeta...ATMEGA168-20PU $0.57 20mhz small crystal http://mouser.com/Search/ProductDeta...-FOXS200-20-LF edit: did not see a divide assembler instruction for either the mega8 or 168. Both muls take 2 cycles __________________ WINDMILLS DO NOT WORK THAT WAY!!! Last edited by dcb; 05-23-2009 at 09:43 PM..