Reset Pin

[kt88seamp]

When the propeller is in normal operation (no programmer attached) should the reset pin be pulled up or down or be left floating?

[mctrivia]

left floating

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24 bit LCD Breakout Board now in. $21.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

[Phil Pilgrim (PhiPi)]

Left floating, only if /BOE is tied to Vss. Otherwise, you will need a pullup resistor.

-Phil

[mpark]

I'm having trouble understanding this floating reset business. Regardless of /BOE, it seems like a floating reset is just asking for trouble. Can someone please explain the rationale?

[Toby Seckshund]

The reset line gains a pull up when /BOE os held low but is the actual value of the pull up quoted anywhere ?

ie - is it 10K ish, etc ???

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[Phil Pilgrim (PhiPi)]

I believe it's more like 5K, which is plenty stiff to preclude requiring one externally.

-Phil

[Toby Seckshund]

That is a good value for the pull up. I was worrying that the value would have been weak, 100K ish, and end up being "almost floating"

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[mpark]

How come BOEn appears to be floating in the protoboard schematic?

www.parallax.com/Portals/0/Downloads/docs/prod/prop/32212-32812-PropellerProtoBoard-v1.3.pdf (http://www.parallax.com/Portals/0/Downloads/docs/prod/prop/32212-32812-PropellerProtoBoard-v1.3.pdf)

[Toby Seckshund]

The 1-5-07 cct shows it decked. So it must just be a "typo"

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Post Edited (Toby Seckshund) : 12/24/2009 3:10:36 PM GMT

[mpark]

Where is this "1-5-07 cct"?

[Toby Seckshund]

parallax + protoboard then google. Same cct, just more ink.

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[mpark]

Thanks.

OK, I think you're referring to this document: www.parallax.com/dl/docs/prod/prop/Propeller-ProtoBoard-v1.1.pdf (http://www.parallax.com/dl/docs/prod/prop/Propeller-ProtoBoard-v1.1.pdf)

That one does show BOEn tied to ground. But it's an old version (1.1). The "typo" is in 1.3. Hopefully it'll be corrected in 1.4.

[Drone]

Has this error been sent to Parallax Support already?

David

[mpark]

I would do it, but who'd I send it to?

www.parallax.com/Company/ContactUs/tabid/66/Default.aspx (http://www.parallax.com/Company/ContactUs/tabid/66/Default.aspx) says support(at)parallax.com is for BASIC Stamp and SX support and doesn't say anything about Propeller support.

[Drone]

@mpark, I've sent propeller questions to the support email address you mention in the rare cases when I have not been able to find an answer in the propeller forum. They usually respond, but not always. You could also try giving them a call.

Rgds, David

[Phil Pilgrim (PhiPi)]

David Carrier is the new point man for Prop support, BTW. But don't forget: Parallax is off until 4 Jan. 2010.

-Phil