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PICList Thread
'Surface mount pics'
1995\11\01@052744 by Steven Addison

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I am trying to generate a 77Khz signal from a surface mount pic in 10ms bursts.
The way I have attempted to do it at the moment I require the program
counter to increment every 0.5uS which means I need a resonator speed of
8MHz - as the PC is incremented at a quarter of the pic clock speed.

All the SMD pics in the (Farnell) catalog are 4MHz devices - and here's the
stupid question - will I be able to use an 8MHz resonator?

If anyone has any sugestions on how to achieve a 77KHz output (in 10mS
bursts) for an SMD 4MHz pic I would love to hear them!

Cheers,

Steve Addison
University of Aberdeen
Tillydrone Avenue
Aberdeen
Scotland
UK
AB9 2TN
Tel: UK 01224 272889
Fax: UK 01224 272396

1995\11\01@114326 by Jim Scorse

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>If anyone has any sugestions on how to achieve a 77KHz output (in 10mS
>bursts) for an SMD 4MHz pic I would love to hear them!

Sounds like you'll gave to go forthe 10 MHz part.

1995\11\01@123425 by John T

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>All the SMD pics in the (Farnell) catalog are 4MHz devices

You don't say which PIC you are using, but they all come in some SMD version in
all speed grades. Some parts have 10 MHz & 20 MHz and others only 20 MHz.
Package is dependent on PIC size - smaller ones in SOIC or SSOP, larger ones in
PQFP or PLCC.

John Magrane
FAE Bell Industries
(408) 734-8570
spam_OUT72172.2347TakeThisOuTspamcompuserve.com

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