PLL in HCS12X Board

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PLL in HCS12X Board

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kayji
Contributor I

Does anybody know where the xtal port is in DEMOMC9S12XEP BOARD? As i know to use a PLL Clock, xtal port should be connected with appropriate capacitors and resistors but my board doesn't have. I've already checked schmetic, manual.

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kef
Specialist I

Do you mean PLL filter components connected to XFC pin like on older S12XD and S12XA? S12XE has no XFC pin and PLL filter components are built in into the chip.

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kayji
Contributor I

yes I meant that. So you mean I just need to make the right codes to use PLL, right? with no capacitors, any resistors.

 

i'm trying to do but still it is not working yet so i suspected that some components are needed to use that.

 

then can i ask one more thing? How much arrange of frequency can i use for bus clock? My friend said 50MHZ bus

 

clock changed by PLL is limit. i'm not sure he is right.

 

 

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kef
Specialist I

S12XE uses different PLL initialization code, so your old routines for S12XD most likely won't work.

Yes, S12XE bus clock tops at 50MHz. Check electrical specs in S12XE datasheet.

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