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Bs2sx — Parallax Forums

Bs2sx

O.A.A.O.A.A. Posts: 25
edited 2007-12-01 15:41 in BASIC Stamp
Hello,
I have developed a home brew BS2E and it is fully functional.For circuitry see www.osmanardali.com/BasicStamp/BasicStamp.htm.
When I try to run it at 50 MHz as BS2SX by changing the 20 MHz resonator/X-tal to 50 MHz, the test program I had uploaded at 20 MHz continues to run with the 50 MHz X-tal but Windows Basic Stamp Editor (version 2.1) gives "No BASIC Stamps found" error message at the RUN command.
Also instead of the 50 MHz X-tal when I insert a 50 MHz resonator (obtained from Parallax) and a 5 pF capacitor between pin 28 and earth the test program stops running.
Help would be greatly appreciated.

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2007-12-01 15:41
    The interpreter that's pre-programmed into the SX to make it a BS2E has some clock dependent timing in it (because that's the way the programming has to be done) and it won't run at 50MHz. You have to use the proper xtal or resonator frequency.
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