"Official" PLL init code

colinh — Thu, 29 Oct 2020 09:33:02 GMT

Hi

Does anyone know of either (a) some Freescale example code for setup of the PLL, or (b) a solid rationale for the NOPs in the following. I have to justify (or otherwise) the presence of the NOPs in some code written by a guy who left the company.

Code:

PLL_ON;                         // macro to turn on PLL
#asm
    "nop";
    "nop";
    "nop";
    "nop";
#endasm
while((CRGFLG & 0x08) == 0){}   // poll for LOCK

The logic behind this question is simple, if they should be there, then some justification should be made, if not they should be removed. Unfortunately the old saying "if it aint broke dont fix it" doesn't hold in this case

Re: "Official" PLL init code

kef — Wed, 27 Aug 2008 20:51:59 GMT

IIRC some old DP256 masksets have some PLL related issues.

Re: "Official" PLL init code

colinh — Thu, 28 Aug 2008 15:30:14 GMT

Thanks Kef

This has given me enough info to chase up Freescale to get the exact details regarding mask-sets etc.

Cheers
Colin

topic Re: "Official" PLL init code in S12 / MagniV Microcontrollers

"Official" PLL init code

Re: "Official" PLL init code

Re: "Official" PLL init code