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Sonsivri > Electronics > Hardware and Tools (Moderator: bbarney) > GTP-USB Lite
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greywolf
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« on: November 22, 2007, 09:35:26 21:35 »
The schematic for the GTP-USB Lite programmer calls for
a 12mhz. crystal. Does anyone know if this can be replaced with
a 16mhz. crystal . If so, what other changes need to be made.

Regards,
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telfo2007
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« Reply #1 on: November 22, 2007, 10:58:01 22:58 »
It seems that gtp firmware clock configuration and timing is based on external 12MHz. Changing clock frequency would make not to be detected by USB PC hardware (not right timing).
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GreenGiant
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« Reply #2 on: November 23, 2007, 10:12:57 10:12 »
16mhz is not possible, see the datasheet for the PIC to determine what speeds are possible.

Normally, its a multiple of 6mhz, as the PLL can create a frequency from almost any multiple of 6mhz, and then it gets divided to 24mhz for the USB coms.
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Ahmad_k
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« Reply #3 on: November 23, 2007, 11:36:04 11:36 »
Stop Posting about GTP-USB programer there is a lot of post in this forum please read before posting, or reply in existing post.

I ask moderator to close this topic
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