Post by thread:Real-Time Clock for 16C84?

>*>I am developing a 16C84 PIC based product with and RS-232 interface and a >*>Real-Time Clock. Any hints, suggestions or recommendations? >*> >*>Dan Garlen > >For the clock: Philips PCF8573 or PCF8583 - Since the `84 has I2C >built in these should work fine. > > Wait a second. Since when does the '84 have I2C built in? On the other hand it does not take much code to handle the I2C primitives. If you just want to talk to a single I2C slave (such as the PCF8583) then it really is no problem at all. Speaking of which. I have on hand a quantity of SMD PCF8583 (I2C real time clock,with 256 bytes ram) that I don't have an immediate use for. If anybody wants some for experimental uses then send a self addressed stamped envelope to the below address and I'll drop a couple of chips along with 32khz xtals into it and smail it back to you. Keep in mind these are surface mount devices. I'm doing this as a favor to readers of this list who have problems getting samples. So to keep things from getting out of hand I'm limiting it to the first 25 people and only one offer per address. As for data sheets and such you're on your own. Henry Carl Ott 22 Nixon Ave. Staten ISland, NY 10304-2210 later....carl ---------------------------------------- Henry Carl Ott N2RVQ spam_OUTcarlottTakeThisOuTinterport.net, .....carlKILLspam@spam@pipeline.com http://www.interport.net/~carlott/ ----------------------------------------

> Greetings, > > I am new to this ... I hope I'm doing this right! > > I am developing a 16C84 PIC based product with and RS-232 interface and a > Real-Time Clock. Any hints, suggestions or recommendations? Dan, Tell us what you are up to and we will be able to give you some advice, otherwise, look for the appropriate application notes. ----------------------- Conny Andersson / LiTH

*>Aaron Sliwenkski <aaronsKILLspamIHS.COM> writes: *>> *>I am developing a 16C84 PIC based product with and RS-232 interface and a *>> *>Real-Time Clock. Any hints, suggestions or recommendations? *>> *> *>> *>Dan Garlen *>> *>> For the clock: Philips PCF8573 or PCF8583 - Since the `84 has I2C *>> built in these should work fine. *> *>The '84 has I2C built in? I don't think so. If you want this, you *>must implement protocols in software, and there's no I2C support in *>hardware either. This does take up a certain amount of the (limited) *>memory, of course.... *> *>Richard H You're right, I was thinking of the `74, but if one wants to use an external clock the two wire interface is superior to any of the parallel approaches that suck up a bunch more pins that could be put to better use. I agree the `84 is a bit cramped for code space in comparison to the `74 but the code to implement the interface protocol is very simple and may be worth the memory.

You wrote: >>*>I am developing a 16C84 PIC based product with and RS-232 interface and a >>*>Real-Time Clock. Any hints, suggestions or recommendations? >>*> >>*>Dan Garlen >> >>For the clock: Philips PCF8573 or PCF8583 - Since the `84 has I2C >>built in these should work fine. >The '84 doesn't have I2C built in (oh how I wish it did). I think it is the >'64 >that does have it. > Correct, there is no I2C on the 16C84. But for real time clock why don't you try the Dallas Semiconductors TimeInaCan(DS1494 TIC). It takes only one I/O pin and some code to communicate with it. Has 4K of memory, alarms, interupts on alarm and more.... Jordanis Haralampopoulos 279 Bloomfield Ave. Bloomfield, NJ 07003 (201)748-5988 Email: .....jordanisKILLspam.....ix.netcom.com 72730,761 on Compuserve