MC9S08GB60A - RTI

[gaminn]

Hello,

I have MC9S08GB60A MCU with 32 khz crystal. I can make RTI running when the mcu is clocked using external crystal (and internal MCUs oscillator). My question is - how to make RTI running when MCU is clocked using internal reference generator (not using the external crystal)? I don't need my MCU to be clocked by any external component, internal clock is sufficient for me. But I want to use RTI (which needs external clock).

Thank you

Martin

[peg]

Hello Martin,

Unfortunately this is not possible with this device.

In run and wait modes the only source for the RTI clock is external

In Stop 2 the only source is its own special internal clock

In Stop 3 either one can be used.

There are NO other choices.

You have to use the timer module to do this in run mode.

I would love to know why the designers did this to us.

[Wingsy]

Peg said, "I would love to know why the designers did this to us."

DITTO! Caused me much grief that they did it this way. I know I shoulda checked before I did the design but to think they would put this limitation on the GB60 is beyond me.

And does anyone know where a person could get their hands on a few hundred GB60s? A 40-week lead time is gonna kill me.

[rocco]

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Wingsy wrote:

. . . A 40-week lead time is gonna kill me.

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Ga!   I hope management doesn't read this - They will make us design it out. We've been having enough problems with freescale parts.

[peg]

and I thought GT16A's at 26 weeks was a problem!

I have been buying up stock from all over the place.

Can't help you with the GB60's though