>-----Original Message-----
>From: Bob Axtell [mailto:cr_axtell@YAHOO.COM]
>Sent: 06 January 2004 00:52
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [PIC:] Pic as an i2c slave
>
>
>I have a lot of experience with the PIC in I2C applications,
>but always
>when the PIC was the Master, because of timeout issues with the ACK in
>slave mode, and of course the problem that START and STOP events are
>difficult to detect; you can't respond fast enough to satisfy a
>hardware-driven MASTER.
>
>To do this well, the PIC would have to be almost dedicated to ONLY
>servicing the I2C Master and doing nothing else. And it would still be
>too slow. While the C873 and F873/876 families have an I2C START/STOP
>interrupt, it is still too slow for most applications. In a nutshell,
>Microchip isn't very sold on I2C and has no interest in
>designing in a proper I2C engine in the PIC product line.

It sounds like you haven't thoroughly investigated the datasheet regarding
the MSSP peripheral.  All the components are provided to provide a high
speed (400kbit/s) I2C slave.

A correctly implemented MASTER device will respond to clock stretching by
the slave, so the time taken to process each byte by the slave should not
matter within reason.  Most bit bashed I2C masters do not implement clock
stretching however.

Regards

Mike




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