RE: Help for init value of SRAM in MPC 562
"Dobbin Allan" <[email protected]> Wed, 2 Jul 2008 06:41:38 -0700
| Newsgroups | gmane.comp.hardware.motorola.microcontrollers |
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| Message-ID | <4147ED8B92A864498825C07E53594E4A036641CB@az33exm20.fsl.freescale.net> |
--1fm5sqc0GJzd15ZrP9ovdelhfC5DD9aX55ZWi3m Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit You could try by experiment, but I think its pretty much random. The more words you use, the less probability of them being randomly initiallised to your values. The SRAM content shouldn't change after a reset, only a power off/on sequence. One word of warning - after a very brief power off sequence, it is highly possibly that some words/bits could change and some could remain. The duration would depend upon several factors i.e. the size of decoupling caps, etc. In this situation, you may find your two inverted words are intact but some of the other words are corrupted. - Allan ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Sudhersan Lal Sent: Tuesday, July 01, 2008 10:43 PM To: [email protected] Subject: [MPC500] Help for init value of SRAM in MPC 562 Hello Everyone Anybody know or can help me to find out more information regarding the initialization value of SRAM contents during power up . I would like to save some values in sram so that I can read that back after a reset , for eg saving a byte value and its compliment and check the consistency between these two variables . This would make sure that, the value is really what I saved prior to reset and not the garbage value which would appear in the memory after a power up. Any existing behavior known for mpc microcontrollers related to this? if it is stored like the value and its compliment , what is the probability of the random initial values in two bytes to be compliment of each other and mistaken as the good value Regards Sudhersan [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] --1fm5sqc0GJzd15ZrP9ovdelhfC5DD9aX55ZWi3m Content-Type: text/html; charset=US-ASCII Content-Transfer-Encoding: 7bit <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> </head> <body style="background-color: #ffffff;"> <!--~-|**|PrettyHtmlStartT|**|-~--> <div id="ygrp-mlmsg" style="width:655px; position:relative;"> <div id="ygrp-msg" style="width: 470px; margin:0; padding:0 25px 0 0; float:left; z-index:1;"> <!--~-|**|PrettyHtmlEndT|**|-~--> <div id="ygrp-text"> <p>You could try by experiment, but I think its pretty much random. The<br> more words you use, the less probability of them being randomly<br> initiallised to your values. The SRAM content shouldn't change after a<br> reset, only a power off/on sequence.<br> <br> One word of warning - after a very brief power off sequence, it is<br> highly possibly that some words/bits could change and some could remain.<br> The duration would depend upon several factors i.e. the size of<br> decoupling caps, etc. In this situation, you may find your two inverted<br> words are intact but some of the other words are corrupted.<br> <br> - Allan<br> <br> ____________<wbr>_________<wbr>_________<wbr>__<br> <br> From: <a href="mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>com</a> [mailto:<a href="mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>com</a>] On Behalf<br> Of Sudhersan Lal<br> Sent: Tuesday, July 01, 2008 10:43 PM<br> To: <a href="mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>com</a><br> Subject: [MPC500] Help for init value of SRAM in MPC 562<br> <br> Hello Everyone <br> Anybody know or can help me to find out more information regarding the<br> initialization value of SRAM contents during power up . <br> I would like to save some values in sram so that I can read that back<br> after a reset , for eg saving a byte value and its compliment and<br> check the consistency between these two variables . This would make sure<br> that, the value is really what I saved prior to reset and not the<br> garbage value which would appear in the memory after a power up. <br> Any existing behavior known for mpc microcontrollers related to this? <br> if it is stored like the value and its compliment , what is the<br> probability of the random initial values in two bytes to be compliment<br> of each other and mistaken as the good value <br> Regards<br> Sudhersan <br> <br> <br> [Non-text portions of this message have been removed]<br> <br> [Non-text portions of this message have been removed]<br> <br> </p> </div> <!--~-|**|PrettyHtmlStart|**|-~--> <span width="1" style="color: white;">__._,_.___</span> <!-- Start the section with Message In topic --> <div id="ygrp-actbar"> <span class="left"> <a href="http://groups.yahoo.com/group/MPC500/message/3943;_ylc=X3oDMTM0aXJzZDhuBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BG1zZ0lkAzM5NDYEc2VjA2Z0cgRzbGsDdnRwYwRzdGltZQMxMjE1MDA2MTA5BHRwY0lkAzM5NDM-"> Messages in this topic </a> (<span class="bld">3</span>) </span> <a href="http://groups.yahoo.com/group/MPC500/post;_ylc=X3oDMTJwamoyY3JvBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BG1zZ0lkAzM5NDYEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMjE1MDA2MTA5?act=reply&messageNum=3946"> <span class="bld"> Reply </span> (via web post) </a> | <a href="http://groups.yahoo.com/group/MPC500/post;_ylc=X3oDMTJlcm1kaWpyBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTIxNTAwNjEwOQ--" class="bld"> Start a new topic </a> </div> <!------- Start Nav Bar ------> <!-- |**|begin egp html banner|**| --> <div id="ygrp-vitnav"> <a href="http://groups.yahoo.com/group/MPC500/messages;_ylc=X3oDMTJlYjYyMGVoBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA21zZ3MEc3RpbWUDMTIxNTAwNjEwOQ--">Messages</a> | <a href="http://groups.yahoo.com/group/MPC500/links;_ylc=X3oDMTJmMWY4czYxBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA2xpbmtzBHN0aW1lAzEyMTUwMDYxMDk-">Links</a> </div> <!-- |**|end egp html banner|**| --> <div id="ygrp-grft"> </div> <div id="ygrp-mkp"> <div id="hd">MARKETPLACE</div> <div id="ads"> <div class="ad"> <hr size=1 noshade><a href="http://us.ard.yahoo.com/SIG=13rd5su4n/M=624381.12730922.13032918.10835568/D=groups/S=1706554205:MKP1/Y=YAHOO/EXP=1215013309/L=/B=kmTKGkLaX.8-/J=1215006109601616/A=5396679/R=0/SIG=14efpdn06/*http://media.adrevolver.com/adrevolver/href?banner=197790&place=26143&url_=http://tc.deals.yahoo.com/tc/blockbuster/display.com?cid=bbi00027 "> Attention, Yahoo! 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