Lockup using xtal1 + pll16x
glentech
Posts: 35
I have a new P8X32A-D40 and have it set up on a solderless breadboard using the serial to propeller and propeller demo board schematics. I have a 5.0 mhz and an 1.8 mhz crystal. Using the blinkled.spin or any other program everything works unless I try to use the xtal1 + pll16x. I have used both crystals with the same results. It is as if the chip locks up as there is no activity. If it makes any difference the number on the chip is A621LAW and I am using software #0.98.1.
Comments
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Chip Gracey
Parallax, Inc.
Just for kicks.... Does your "solderless breadboard" have a metal back or ground plane that could be introducing too much capacitance to the crystal and pins?
XTAL1 has about a 36pF capacitance and is designed to handle a crystal range from 4MHz to 16MHz ... if the solderless breadboard is introducing a large amount
of capacitance to the crystal, it might not oscillate properly or at all. XTAL2 has a lower capacitance (26pF) and XTAL3 has the lowest (16pF). Try using one of the
other settings XTAL2 or XTAL3 on your solderless breadboard and let us know what happens.
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
Regards,
Chester
-Erik
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Chip Gracey
Parallax, Inc.
- Erik
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Chip Gracey
Parallax, Inc.