MPC5xxx中的主题 XOSC need enable in DCF?

XOSC need enable in DCF?

bwp530 — Wed, 22 May 2019 10:30:28 GMT

I download a test code on self-made MPC5777M board , which works well on EVB board. I find the external crystal does not vibrate. When I check the MRM, I find this:

does that mean I must configure DCF on my board to make crystal work?

Re: XOSC need enable in DCF?

petervlna — Wed, 22 May 2019 11:20:48 GMT

Hi,

Yes, you have to enable the XOSC in UTEST miscellaneous DCF record.

To do so you can use our DCF calculator:

https://community.nxp.com/docs/DOC-341542

regards,

Peter

Re: XOSC need enable in DCF?

bwp530 — Wed, 22 May 2019 11:46:17 GMT

hi Peter, thanks, I upload the DCF records, I found the evb board is same as dcf record on my board,

S315004002E0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFD8
S315004002F0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC8
S3150040030005AA55AF000000000000000000000000F4
S315004003100000000000000000000000000000000097
S315004003200000000000000000000000000000000087
S315004003300000000000000000000000000000000077
S315004003400000000000000000FFFFFFFFFFFFFFFF6F
S31500400350FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF67
S31500400360FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF57
S31500400370FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF47
S31500400380FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF37

Should I change it to configure xosc enable? please help me to check the attached srec files.

Re: XOSC need enable in DCF?

petervlna — Fri, 24 May 2019 07:11:55 GMT

Well,

The EVB do not use crystal after reset. SW runs from IRC 16MHz. User can enable crystal from SW later on.

If you want to have crystal active right after reset you must program it in DCF records.

regards,

Peter