topic Re: MC9S08QE4 not running with external crystal in 8-bit Microcontrollers

MC9S08QE4 not running with external crystal

soli255 — Wed, 30 Jan 2013 07:47:57 GMT

Hello, I have a problem with running my QE4 with external crystal (I have tried 11.0592MHz / 8MHz / 4MHz - different packages and manufacturers)

My code:

ICSC2_BDIV = 0b10;

ICSC2_RANGE = 1;

ICSC2_HGO = 1;

ICSC2_LP = 0;

ICSC2_EREFS = 1;

ICSC2_ERCLKEN = 0;

ICSC2_EREFSTEN = 0;

while ( ICSSC_OSCINIT == 0 );

ICSC1_CLKS = 0b10;

ICSC1_RDIV = 3;

ICSC1_IREFS = 0;

ICSC1_IRCLKEN = 0;

ICSC1_IREFSTEN = 0;

Problem is that program freez on while condition - crystal is not running. I use standart connection to XTAL and EXTAL pins with 22p capacitors and 1MR resistor.

Any suggestion what is wrong?

Thx

Re: MC9S08QE4 not running with external crystal

bigmac — Sun, 03 Feb 2013 07:10:19 GMT

Hello,

Are you attempting to use FEE mode or FBE mode - there is some ambiguity?

For FEE mode and RDIV setting of 3 (reference division by 256), only the 8 MHz will work. A lower division setting would be required for the 4 MHz crystal. The 11.0592 MHz crystal is unsuited to FEE mode.

You could also try commenting out the wait loop for the OSCINIT flag.

Regards,

Mac

Re: MC9S08QE4 not running with external crystal

soli255 — Sun, 03 Feb 2013 09:30:02 GMT

Hello Mac,

I am following the "Using the Internal Clock Source (ICS) for the HCS08 Microcontrollers" chapter in HCS08QRUG.pdf and I was trying to run in this FBE.

I was also using wait loop like this for ( i=0 ; i<10000 ; i++ );

And also I modified my layout and move 22p capacitors very close to crystal and each other.

But franklly i will be glad for any mode runnig with crystal - because i already try several crystals and many of code.

Thx

Re: MC9S08QE4 not running with external crystal

soli255 — Mon, 04 Feb 2013 20:19:25 GMT

I just finish working on QE with 32,768kHz crystal, but another fail. Code for FEE and 32kHz here:

// Fbus = ( Fext / RDIV * 512 / BDIV ) / 2

ICSC2_BDIV = 0b01; // selected clock / 2

ICSC2_RANGE = 0; // low range select

ICSC2_HGO = 1;

ICSC2_LP = 0;

ICSC2_EREFS = 1; // oscillator request

ICSC2_ERCLKEN = 0;

ICSC2_EREFSTEN = 0;

//for ( i=0 ; i<10000 ; i++ );

while ( ICSSC_OSCINIT == 0 );

ICSC1_RDIV = 0; // div by 1

ICSC1_IREFS = 0;

ICSC1_IRCLKEN = 0;

ICSC1_IREFSTEN = 0;

ICSC1_CLKS = 0b00; // output from FLL

my QE is still without clock from external crystal ...

Re: MC9S08QE4 not running with external crystal

soli255 — Tue, 05 Feb 2013 19:22:33 GMT

I just run my QE with 6MHz crystal in FBELP mode by this code:

// *** FBELP MODE ***

// 6MHz Crystal

// Fbus = ( Fext * 1 / BDIV ) / 2

ICSC2_BDIV = 0b00; // selected clock / 1

ICSC2_RANGE = 1; // high range select

ICSC2_HGO = 0; // low power

ICSC2_LP = 1; // FLL disabled

ICSC2_EREFS = 1; // oscillator request

ICSC2_ERCLKEN = 0;

ICSC2_EREFSTEN = 0;

for ( i=0 ; i<1000 ; i++ );

//while ( ICSSC_OSCINIT == 0 );

ICSC1_RDIV = 0b111; //

ICSC1_IREFS = 0;

ICSC1_IRCLKEN = 0;

ICSC1_IREFSTEN = 0;

ICSC1_CLKS = 0b10; // external reference clock selected

I am still quite confused by this many modes of operation, and fact that in FBELP mode BDC should not be active, but I have full functional debuging (code step, breakpoint, periodical RAM readouts ...)