There are PICs with built in can... For example, take a look at the PIC18F2580, fully CAN hardware and CAN compliant Regards, Mauricio Jancic Janso Desarrollos - Microchip Consultants Program Member info@janso.com.ar www.janso.com.ar (54) 11 - 4542 - 3519 -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of Maarten Hofman Sent: Wednesday, September 14, 2005 9:40 AM To: Microcontroller discussion list - Public. Subject: Re: [PIC] Re: Interfacing more than 2 pics > On 9/14/05, Manwlis Giannos wrote: > > Hello to all. I'm new to the list and i don't really know if i'm > > addressing the right list. > > I want to interface more than 2 PIC > > micros. How can achieve that? Is the SPI the best solution? In 1996, "CAN" (controller area network) was the preferred method of connecting multiple microcontrollers together. It works really well, but unfortunately PICmicros don't have built in support for CAN (some 8051 do, as far as I know). Some PICmicros have support for I2C, though, and I2C also allows you to connect multiple microcontrollers to the same bus. SPI is possible, but unfortunately it requires you to increase the number of pins used for every device you add, and it isn't really peer-to-peer (multi-master). As Vasile said, you could also use a 4 or 8-bit parallel bus with addressing lines, but that will really eat away your I/O capabilities. Obviously, if you provide more information about what you want to do, that would help in possible bus selections. Greetings, Maarten Hofman. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist