I am using the MSP430F5529 and I was wondering if there is an interrupt that fires when the power goes off and comes back on. Most of my program works dandy, but there is one peripheral (BQ76PL536) that needs to be reset and re-addressed on power on. I can do this in software, but it is used all over the place for different reasons and doing this would be a time-consuming affair that I am hoping to avoid.
Is there an interrupt that fires anywhere that would help me?
Thanks in advance!
MSP-TS430PN80USB w/ MSP430F5529
CCS Version: 5.2.1.00018
As per my knowledge no MCU will work without power :)
So you should have a hardware mechanism to detect the power loss along with a efficient capacitor / battery backup to aid your MCU to act in case of power fail detection.
Thanks & Regards,
I figure the only way to detect a power loss is with something like that. I was just hoping there was an easier way.
On 5x/6x family, you can read the SYSRSTIV register to get the reason of the last reset. The register can be read multiple times and reports the reasons based on priority (not based on teh order they appeared), but the last one reported is always a BOR (brownout-reset = most likely a power cycle, or at least a significant drop of VCC)
So if you read this register on start of your application (until it returns 0) you'll see whetehr a BOR happened since last restart (or just a PUC due to a violation or a WDT timeout).
However, a low signal on the RST line will also report a BOR, even though there might be no fail on VCC.
_____________________________________Before posting bug reports or ask for help, do at least quick scan over this article. It applies to any kind of problem reporting. On any forum. And/or look here.If you cannot discuss your problem in the public, feel free to start a private conversation: click on my name and then 'start conversation'. But please do so only if you really cannot do it in a public thread, as I usually read all threads. And I prefer to answer where others can profit from it (or contribute to it) too.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.