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resistion
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KB?
resistion   6/26/2014 8:05:11 AM
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I didn't think that's enough to even advertise. 16KB is not even a usable text file.

Wnderer
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Re: KB?
Wnderer   6/26/2014 8:50:14 AM
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@resistion I didn't think that's enough to even advertise. 16KB is not even a usable text file.


Who said anything about text files? It's plenty for lots of 'embedded' applications. I used to program Motorola 68HC705K1's 504 bytes of eeprom/otprom and 32 bytes of ram.

 

Max The Magnificent
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Re: KB?
Max The Magnificent   6/26/2014 9:29:08 AM
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@Wnderer: I used to program Motorola 68HC705K1's 504 bytes of eeprom/otprom and 32 bytes of ram.

You had 32 bytes? You were lucky! We used to dream of 32 bytes LOL

I agree -- 16KB might not sound much to some youngsters, but it goes a long way if you know what you are doing.

resistion
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Re: KB?
resistion   6/26/2014 9:40:45 AM
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Given that most MCUs are (now) pushing MB use, I did find this quite light.

Max The Magnificent
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Re: KB?
Max The Magnificent   6/26/2014 9:43:22 AM
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@resistion: 16KB is not even a usable text file.

Hang on -- 16KB is the max size for the old 57x MCUs -- the new 59x MCUs go upo to 64KB and the new 69x MCUs go up to 128KB

resistion
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Re: KB?
resistion   6/26/2014 10:16:33 AM
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I think it has a shot at replacing SRAM but Flash is currently used for MB storage. MRAM is another candidate commonly proposed for the same purpose, because of its high (also not unlimited) endurance. Both can also be disturbed by cumulative if not direct reads. I wonder which would be the preference.

JanineLove
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Use?
JanineLove   6/26/2014 9:33:28 AM
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Seems like a good combination of features for the applications mentioned, sensors, home security, etc.  Is it missing anything you wish it had?

Max The Magnificent
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Re: Use?
Max The Magnificent   6/26/2014 9:40:50 AM
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@Janine: Is it missing anything you wish it had?

I actually have a MSP-EXP430FR5969 LaunchPad fraturing one of these little FRAM-based MCUs sitting on my desk -- I just need to find the time to play with it to discover more.

I'd be interested to hear from other readers as to how they would use the non-volatile nature of the FRAM to do things differently to the way they would use traditional Flash+SRAM MCUs

GSKrasle
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Re: Use?
GSKrasle   6/26/2014 1:07:08 PM
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Max,

My big concern is the write-ability: We've all had a pointer go blooie (which is less likely in high(er)-level languages like C than in assembler, but a 16k chip is probably going to see assembler). Do they provide some way to lock/protect the code portion of the memory?

Max The Magnificent
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Re: Use?
Max The Magnificent   6/26/2014 1:14:42 PM
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@GSKrasle: Do they provide some way to lock/protect the code portion of the memory?

I don't know -- I'll ask them

TI_Mark
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Re: Use?
TI_Mark   6/26/2014 6:29:23 PM
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The devices in the MSP430FR59x/FR69x series can protect portions of code using a couple of built-in modules. The Memory Protection Unit (MPU) monitors and supervises memory segments as defined in software to be protected as read, write, execute or a combination of the three. What's more, these devices have built-in IP Encapsulation (IPE) capabilities to lock sections of code from access via JTAG, BSL or Direct Memory Access.

resistion
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Re: Use?
resistion   6/26/2014 9:42:39 AM
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The claim of unlimited endurance is disingenuous. Please provide real measured or guaranteed cycles. MRAM has this same marketing habit as well.

Max The Magnificent
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Re: Use?
Max The Magnificent   6/26/2014 10:18:41 AM
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@Resiston: The claim of unlimited endurance is disingenuous. Please provide real measured or guaranteed cycles.

As I recall, the number they gave me was 10^15 = 1,000,000,000,000,000

resistion
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Re: Use?
resistion   7/4/2014 7:43:37 PM
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Each read takes a cycle as well, you still have to write after read.

Max The Magnificent
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Re: Use?
Max The Magnificent   7/7/2014 10:20:23 AM
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@resistion: Each read takes a cycle as well, you still have to write after read.

But reading from any form of memory (Flash, EPROM, FRAM) doesn'd degrade it and doesn't count as part of the total number of cycles -- when they say Flash can support only 10,000 cycles, for example, they are talking about erase-&-write cycles, not read cycles.

Max The Magnificent
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Re: Use?
Max The Magnificent   7/7/2014 10:21:03 AM
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@resistion: Each read takes a cycle as well, you still have to write after read.

You don't always have to perform a write after performing a read.

resistion
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Re: Use?
resistion   7/7/2014 5:12:11 PM
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The read checks polarization by monitoring a particular write operation. When the polarization has been flipped, the original state has to be written back.

Max The Magnificent
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Re: Use?
Max The Magnificent   7/7/2014 5:18:51 PM
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@resistion: The read checks polarization by monitoring a particular write operation. When the polarization has been flipped, the original state has to be written back.

Wow -- I learn something new every day -- thanks for sharing.

resistion
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Re: Use?
resistion   7/7/2014 6:53:09 PM
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Of course there's been work to get around this but it's not standard FRAM.

Kinnar
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FRAM really gives speed and power improvement
Kinnar   6/26/2014 2:08:37 PM
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FRAM based controllers from TI are really a very nice design and provide improvement both in terms of speed and power. Many small size embedded systems are adopting these controllers especially in biomedical equipments.

RNEU
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Re: KB?
RNEU   6/30/2014 9:06:06 AM
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Up to 128kB might be more than enough for many applications.

If an application needs MBs go for an MCU with MBs and you can justify the cost. A smart sensor sitting remotely powered from <4mA in a 4-20mA loop or a smoke detector will never need MBs.

 



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