Acronym: Electrically Erasable, Programmable Read-Only Memory. Sometimes used with Flash parts that are similar to old EEPROM parts.

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Looking for 4 bit memory option

I'm building a small and simple 4-bit CPU and I'm looking for an IC to store the program opcodes. I've considered using eeproms although they seem too large for my purpose, being in the kilobyte ...
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1answer
81 views

EEPROM Write Limit [duplicate]

Just curious as to why do non volatile memories like EEPROM in an AVR have a write limit ? Also is this limit per location/adress in the memory or on the memory as a whole ?
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1answer
164 views

Is there any tool to read/write EEPROM of STM32L from the host?

I'm using STM32L152RTC6 (link to similar MCU line) with a built-in EEPROM (8k). I wonder if there's any tool that allows me to read/write the EEPROM from the host side, other than programming the MCU ...
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1answer
136 views

reading EEPROM at startup only versus reading everytime from EEPROM

I have an AVR code where I store data in EEPROM, this data is actually some settings and USER phone numbers. These are quite often accessed. So I planned to read all the values at start-up to memory ...
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1answer
116 views

The difference between storage patterns in RAM or SD cards from EEPROM [closed]

I have used EEPROM to store data in embedded systems. I would like to know about the pattern of RAM and SD cards which were used to store data. Is it that complex in terms of using RAM or SD cards? I ...
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1answer
75 views

Programming an EPROM using 8085 kit

I need to program an EPROM/EEPROM with the code for an 8085. I do not have a programmer. I can't buy one. But I have access to an 8085 kit. Can I use it to program the EPROM/EEPROM via an interface? ...
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2answers
84 views

Play PCM stored in EEPROM without microcontroller

Is it possible to connect digital-to-audio converter with a EEPROM storing PCM data to play that data with a speaker? I am interested in a solution that does not employ any kind of microcontroller. ...
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0answers
49 views

Is EEPROM read-speed or capacity being held back by the “EEP” qualification?

EEPROMs, the commonplace modern example being NAND Flash memory, seem to be pretty great as a data storage medium. They're pretty fast, pretty capacious, and best of all, when an EEPROM wears out, it ...
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1answer
142 views

eeprom data corruption during power failure

I recently found a problem with eeprom of a PIC16F877A which is used to control the speed of a dc motor. The drive is supposed to work on the last set speed even if the power fails. But the problem is ...
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2answers
352 views

What do memory configurations like “256Kx18” mean?

This is a beginner question here. When choosing memory ICs, one of the options is the memory size/configurations. I understand the size part, but what does the "16Kx9" mean? It seems the same memory ...
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2answers
160 views

Will an SPI EEPROM chip have the same issues with non-atomic write operations as a dsPIC's internal EEPROM? [duplicate]

A while back I had some intermittent trouble with the internal EEPROM of a dsPIC. Every so often, some value in the EEPROM would be found zeroed out on power-on. I tracked the problem down to when the ...
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4answers
310 views

Will an SPI flash memory chip have the same issues with non-atomic write operations as a dsPIC's internal EEPROM?

A while back I had some intermittent trouble with the internal EEPROM of a dsPIC. Every so often, some value in the EEPROM would be found zeroed out on power-on. I tracked the problem down to when the ...
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2answers
132 views

usb drive EEPROM IC how is memory read-only blocked and unblocked?

I notice ofteen free give-away usb thumb drive come with a certain memory space locked and unwritable so that a 4 GB flash drive for instance has 1GB of advert which cannot be format. Given that thumb ...
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1answer
28 views

Floating EEPROM (28c64A) pins an option?

I am building an eeprom programmer for the 28C64A (dip package) with my old basic stamp ii "homework" board (lost my arduino in the move). I have the first four address and data pins, as well as W E ...
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1answer
54 views

Working principle of floating gate tunneling oxide

Floating gate tunneling oxide (FLOTOX) is used in electrically alterable rom. Tunneling of charge takes place through tunneling oxide into the floating gate. What is the working principle of this? How ...
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1answer
332 views

How to store array of values in EEPROM of ATmega16 and then read it in sequence

I have this program in which I can store a single value in EEPROM. Can I store an array of values in EEPROM? How? ...
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2answers
115 views

Decoding ADC pin labels

I'm about to buy a parallel ADC to connect to an EPROM in a analog-digital circuit. I've found some potential ADCs but am having trouble deciding if the ADC and EPROM are compatible. A bistable ...
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2answers
94 views

Estimating EEPROM read time

This is a question in relation to USB transmissions crash my software GUI. I posted this question separately so that I could clarify my question separate from the other one. I have the same ...
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1answer
109 views

Dot Matrix IC message board [closed]

I'm trying to make a dot matrix message board -type thing work, The dot matrix IC's are the DL-57 Alpha Numeric Dot Matrix Display [Data Sheet] : ...
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1answer
319 views

Is there a way to preserve EEPROM contents in AVR Atmega when burning a new firmware to flash with avrdude?

I'm finishing an application which will use some non-volatile parameters stored on an AVR Atmega644P EEPROM. The initial EEPROM values were generated using the EEMEM attribute (like described on this ...
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2answers
221 views

Algorithm for finding next data in eeprom [closed]

I have an EEPROM and I'm storing data in it, from address 0x00 to 0xff. I have to scan the EEPROM regularly for non zero values. ...
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1answer
153 views

How to effectively tackle long page write in EEPROM

I'm using C18 compiler and 24LC256 EEPROM. I would like to know how to handle Rollover case in terms of large EEPROM write.I'm writing a Routine that writes 120 Bytes every half an hour and i would ...
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3answers
68 views

Conditions for page write in EEPROM

I have learned about page write operations from App notes and data sheets of EEPROM chips.But i want to clear certain doubts. I have an EEPROM chip which got 32KB and 64B Page Size. 1.Can i Write ...
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3answers
158 views

Why are EEPROM sizes measured in “k” or kbit and not kbyte or byte?

I keep seeing EEPROM datasheets using terms such as 4k, 16k, etc. and they're referring to 4 kilobit and 16 kilobit, bits, megabits, and kilobits are often used. Very seldom do they use byte prefixes. ...
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1answer
111 views

Parallel NOR Flash ROM in-system programming issue (Micron M29F160)

I'm attempting to program a Micron M29F160 Flash ROM (datasheet) that is memory-mapped into a larger system, and I want to program it from the external interface of that system, but I can't seem to ...
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1answer
81 views

Microchip, memory measured in IEC?

It doesn't say on the data-sheet, but I'm curious where i can find if Microchip uses IEC or SI as standard for there memory sizes. For example: ...
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60 views

Memory Problems

I've been having some problems with memory ICs, specifically Flash and EEPROM. I've had some experience with the 7400 series for some time...logic gates are pretty straightforward. Input something, ...
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1answer
95 views

Reading 68HC05 Eeprom

I want to know if there is any way to read Eeprom from an 68HC05 with an Arduino. I've been reading other SPI and I2C EEPROM's. Thanks for your help and have a nice night. Sorry for my bad English if ...
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1answer
158 views

I2C delay needed and c18

I am using I2C and I have earlier posted doubts about I2C here. I am using PIC controllers and using their compiler C18. I used their libraries to build a function to write data in EEPROM via I2C, and ...
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2answers
393 views

CRC for eeprom data check

I wanted to check redundancy in eeprom and crosscheck the data for any errors occurred or not and I ended up reading CRC code. I found it useful but have some doubts that need clarity. My objective ...
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2answers
126 views

I need to lock reading my mega328 flash but be able to write to the eeprom

I need to be able to prevent other from copying my program placed in the flash, but want to still be able to write to the EEPROM. I tried the lock bits by setting them to Mode 3 (0x3C). But that will ...
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2answers
176 views

EEPROM data check

I am communicating with an EEPROM chip with micro controller. I am writing certain data in to specific addresses in EEPROM and needs to check the data occasionally. But I have no idea other than ...
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1answer
428 views

Writing data on EEPROM or Flash memory of the PIC18F47J53

So I am using the 18F47J53 in Hitech PICC18-PRO compiler with MPLAB-X IDE, and for some reason there happens to be absolutely no support for the reading/writing function to either the flash or the ...
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1answer
65 views

EEPROM address definitions and delay

I am using 24LC256 EEPROM which have addresses from 0x0000-0x7fff. But I would like to predefine certain address from EEPROM to specific tasks, like from 0-100 for task-1 and so on. Does predefining ...
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1answer
62 views

25AA320A EEPROM byte write and page write

I need to write data into my external EEPROM 25AA320A using Attiny2313. I know how to write one byte at a time. For example, spieeprom_write (200, 7); with 200 being the starting address on EEPROM, ...
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1answer
119 views

How to program external EEPROM using USBtinyISP or Pocket AVR programmer

I want to write data into an external EEPROM from my computer using USBtinyISP or Pocket AVR programmer. Is it possible to do that? I know they can be used to program microcontrollers, but not sure if ...
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134 views

Noob needs mac OSX based USB PIC programmer to flash eon EN29LV040A PLCC

Please excuse my ignorance of the more technical issues here. I have a Kurzweil synthesizer which has a corrupt flash chip, which I need to reprogram. I would like to know is what PIC programmer is ...
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141 views

How do I program a serial EEPROM IC using a raspberry Pi?

I am trying to program the 25L12835F Serial EEPROM with the firmware of the Pineapple WiFi router. I have the u-boot.bin file from Alfa. I have tried a programmer from eBay, but the software is unable ...
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1answer
86 views

Programming an 82S23

I have to program an 82S23. There is surprisingly little documentation on how to do this. There are datasheets that will tell you how to read it, but not burn. I built one following these ...
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1answer
206 views

How do I determine what microcontroller is the right one for my project? [closed]

I have just started developing a tiny GPS trackingdevice that (eventually) will be able to log positioning-data on demand - via SMS commands and/or via a smartphone-application. The device should be ...
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179 views

PIC : EEPROM not write properly to 0xFF in PIC18F67K22 controller

I am writing values from 0x50 to 0x3ff in EEPROM of pic18f67k22. Whenever eeprom is getting full, I am writing 0xFF and then after write my data from 0x50 location. but some time eeprom is not write ...
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3answers
700 views

Minimum voltage to avoid EEPROM corruption for ATMega328P

I have a battery powered contraption with an ATMega328P with Arduino code that sleeps most of the time. Occasionally it needs to write some values to EEPROM. It's battery powered so I have tried to ...
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1answer
46 views

Can I replace an AT28c17 with a CAT28c65B without changing my software?

The AT28c17 is a 16k e2prom while the CAT28c65B is 64K bit e2prom and both are in a 32 pin PLLC package. They have 10 adresss lines with the only difference being the AT28c17 has A0-A10 adress lines ...
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1answer
500 views

AVRDUDE: Write EEPROM bytes without file

Is it possible to write EEPROM bytes via AVRDUDE and an AVRISP mkII directly from the command line without needing an EEPROM file read from another chip? Kind of like how you can specify the fuse ...
2
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2answers
960 views

the . hex file we burn goes to flash memory or RAM or EEPROM of Atmega8?

The flash memory of atmega8 is 8Kb. Is this the maximum size for the .hex file, or it the max memory which i can allocate to variables in my code? If none of the above is true, than what is memory ...
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4answers
400 views

Difference between data retention in flash and in EEPROM

In a security recommendation (Mobile Operating System Protection Profile, §4.2.1 FCS_CKM_EXT.4.1), the following instructions are given to securely wipe a cryptographic key from memory: For ...
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8k views

What is the difference between Flash memory and EEPROM?

Flash memory storage and EEPROM both use floating gate transistors for storage of data. What differs between the two and why is Flash so much faster?
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464 views

Reading/writing garbage when programming AD45DB161D EEPROM (SPI) using Arduino

I'm trying to program the AD45DB161D. I found two libraries and Arduino example code both aren't functioning as expected. I suspect it's hardware problem. When reading the data and dumping it to the ...
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2answers
163 views

USB device with a serial number and 3 LEDs

I'm looking for a way to build a USB key. I have a bit of experience with the Arduino, however for this project that seems to be a bit of overkill. The key should contain a unique serial number ...
4
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1answer
519 views

Problem with I2C EEPROM communication

I have a STM32L MCU connected to M24LR64E, an I2C EEPROM. Previously i had this setup working but then i changed some things (layout, firmware) and somehow i screwed the I2C and it is not working now. ...