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Does 6.25Mhz xtal need special timing? — Parallax Forums

Does 6.25Mhz xtal need special timing?

soshimososhimo Posts: 215
edited 2010-07-29 14:35 in Propeller 1
I just got a couple of these bad boys. I hear it's possible to "overclock" the propeller with these. Do I need special timing with any of the time critical objects such as full duplex, spi, etc?

TIA

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2010-07-29 04:32
    Most time critical objects use CLKFREQ to compute timing values and, if you set the clock constants (like _CLKFREQ or _XINFREQ) properly, the timing will all work out correctly. A few time critical drivers (like some video drivers) are intended to be used with an 80MHz system clock and will have problems with 96MHz or 100MHz or 104MHz unless some other constants in the code are changed. FullDuplexSerial should work fine and the SPI and I2C drivers should be timing independent.
  • KyeKye Posts: 2,200
    edited 2010-07-29 14:27
    Video drivers just need greater than or equal to 80Mhz.

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  • potatoheadpotatohead Posts: 10,261
    edited 2010-07-29 14:35
    ...except for the Parallax drivers, which will operate down to 64. AiGeneric will operate below 80, as will my older 8x8 drivers.

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