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RCFAST and <> 80mhz options? — Parallax Forums

RCFAST and <> 80mhz options?

JavalinJavalin Posts: 892
edited 2010-03-25 12:26 in Propeller 1
Hiya

The manual doesn't appear to be clear (or at least not to me, which probably isn't the same thing!).

I can run the propeller:
_clkmode = RCFAST

at 12mhz?· But my fullduplexserial doesn't work - even at 9600 baud.· Surely it can't be that slow / inacurate off the internal clock?

If I want to run with crystal for acuracy, then can I use the current 5mhz crystal and just change the PPL mode? i.e.

_clkmode = xtal1 + pll1x    ' 5mhz
_clkmode = xtal1 + pll2x    ' 10mhz
...
_clkmode = xtal1 + pll16x   ' 80mhz

Or have I just answered my own questions?

I love this chip - is there anything it can't do?

James

Post Edited (Javalin) : 3/25/2010 12:27:27 PM GMT

Comments

  • LeonLeon Posts: 7,620
    edited 2010-03-25 12:12
    Check the accuracy in the data sheet. You need a crystal.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Leon Heller
    Amateur radio callsign: G1HSM
  • JavalinJavalin Posts: 892
    edited 2010-03-25 12:26
    ok thanks - had forgotton about the datasheet! Duh.

    I'll run it with the 5mhz crystal!

    James
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