S12 / MagniV MicrocontrollersのトピックRe: Interrupt From Interrupt

9S12E - Interrupt From Interrupt

admin — Mon, 12 Mar 2007 22:41:09 GMT

Hello,

Can an interrupt be called while you are within and ISR in a 9S12E?
ie:
TIM0
TIM1

Alban Edit: FSL Part Number in Subject line.

Message Edited by Alban on 2007-03-14 11:32 AM

Re: Interrupt From Interrupt

Steve — Tue, 13 Mar 2007 00:07:46 GMT

Yes, by you must re-enable interrupts.

By default the I bit is set when an interrupt is taken and this prevents further interrupts. You can clear the I-bit in the ISR and another interrupt can occur. The S12X family includes an interrupt priority capability that limits nested interrupt sources to those at a higher priority but this is not the case for the S12.

Re: Interrupt From Interrupt

admin — Tue, 13 Mar 2007 02:20:06 GMT

For timers TIM0 and TIM1; is setting these 2 flags enough to allow for other interrupts to occur?

TIM0_TFLG2=128;
TIM1_TFLG2=128;

For a RTI; is setting this flag enough to allow for other interrupts to occur?
CRGFLG = 128;

Re: Interrupt From Interrupt

Lundin — Tue, 13 Mar 2007 14:30:07 GMT

What Steve said. As for which bit that does what, check the manual.

Re: Interrupt From Interrupt

PsychoDebugger — Wed, 18 Apr 2007 16:07:30 GMT

This can be useful

A Software Interrupt Priority Scheme for HCS12 Microcontrollers

Message Edited by PsychoDebugger on 2007-04-1810:16 AM