topic Re: Problem with interrupt controller S12XDP in S12 / MagniV Microcontrollers

Problem with interrupt controller S12XDP

admin — Mon, 29 Sep 2008 22:20:21 GMT

Hello, I wish to apologise for my English at once................... Has faced the following problem, I program MC9S12XDP512, and I can not understand as to customise priorities of interruptions....... Has written the program where priorities established in register INT_CFDATA for each interruption accordingly, but at occurrence of the enclosed interruption, interruption which interrupts does not come to the end. From the description I have understood that by default in register INT_CFDATA содержиться 0x01, and interrupt priorities are arranged according to layout of interrupt vectors in memory. To change the interrupt priority it is necessary to change contents of register INT_CFDATA. As it is written that it is possible to change priority by means of register INT_XGPRIO how it occurs absolutely not clearly..................... Prompt how to be, from that documentation that for me I can not eat that to understand.......(((((((((

Re: Problem with interrupt controller S12XDP

kef — Thu, 02 Oct 2008 15:55:36 GMT

Translation engine should apologise for their translation, not you :smileyhappy:.

Don't know if that helps, but:

INT_CFDATAx registers are paged. INT_CFADDR register switches the set of interrupt priority settings accessible via INT_CFDATA0 - INT_CFDATA7 memory window.

It's not enough to rise interrupt priority of specific interrupt. To make interrupt nesting enabled, all interrupt handlers should reenable interrupts using cli instruction or something similar.

Re: Problem with interrupt controller S12XDP

admin — Fri, 03 Oct 2008 14:03:51 GMT

Thanks the help, Kef. On the score of nested interruptions I read that it is necessary to be resolved anew interruptions. My problem consisted in that that I thought that it is possible to achieve nested interruptions handled XGATE, and it has appeared what to interrupt its operation the previous procedure will be impossible differently is lost.

Re: Problem with interrupt controller S12XDP

kef — Fri, 03 Oct 2008 15:02:44 GMT

S12XD /S12XA XGATE threads can't be interrupted at all. S12XE XGATE is much better in this respect.