>-----Original Message----- >From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] >Sent: 01 September 2005 15:01 >To: Microcontroller discussion list - Public. >Subject: Re: [PIC]: what does bit SSPSTAT<7> do ? > >but how does it control the slew-rate: >PIC16F877 manual states > 0 = slew rate control enabled for high speed mode (400 kHz) > 1 = slew rate contral disabled for standard speed mode (100 >kHz and 1 MHz) > >what is enabling of slew rate ??? > >I guess they mean something like this: > 0 = smitt-trigger input enabled (for any frequency you like) > 1 = smitt-trigger input disabled (for any frequency you >like) and above it doesn't do anything with the slew rate of >the output. > >Is this correct ?? > >Stef Mientki Slew rate refers to the maximum rate of change of voltage (which essential determines the rise/fall time of the clock/data signals), and the PIC can only control this on it's outputs. I don't know the specifics of exactly how it controls the slew rate, I guess some kind of compensation is applied around the pins output driver. The electrical specifications in the back of the PICs datasheet should give the relevant rise/fall times. Regards Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist