Questions tagged [eeprom]

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

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Is the ROM of an MCU NAND FLASH ?

I understand binary code is stored in the ROM area of an MCU. Typically most MCUs have FLASH EEPROMS. Is this really the NAND type FLASH storage we find in most SSDs? If not, what are the ...
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4answers
535 views

EEPROM I2C driver hanged during ESD test?

In our prototype , we have a I2C based EEPROM . During ESD Test(High potential spark is injected into system for a very short moment), the drivers hangs in the I2C code. Basically there are while ...
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494 views

Device including RTC EEPROM and battery?

I am currently designing an electronic board and i got a question: Do you know if there is any device in which are integrated an RTC, an EEPROM and a battery? I heard about this type of device (i ...
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For maximum EEPROM readability into the future is it better to write once and leave it, or periodically “refresh”?

What is the best strategy if I have a static value that I want to store in EEPROM once and then be able to read it as far into the future as possible? Is it better to write it one time and never ...
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1answer
152 views

ATTINY84 - EEPROM read cycle time

Thought this was easy, but I can't find this information on how long / how many cycles a EEPROM read operation on an ATTINY84 takes. Page 22 of the datasheet has a table with write and erase times: ...
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1answer
273 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
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Manual EEPROM Programming Problem

I have a 28c256-25 EEPROM that I have created a breadboard circuit to program. The datasheet says after the address is set and the data is put on the I/O pins, a low pulse on /WE while /OE and /CE are ...
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1answer
86 views

Why Flash memories have less P/E (Program / Erase) cycles (e.g. 100K) compared to EEPROM (e.g. 1000K)?

As per datasheet of EEPROM: CAT24C02 (On Semiconductors) - P/E Cycle count is > 1000k whereas as per datasheet of NAND Flash: MX30LF2G18AC-TI (MXIC) - P/E Cycle count is > 100k I would like to know ...
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256 views

Parallel EEPROM write to with I2C

I was wondering if there is a hybrid between the serial and parallel EEPROM's? What I mean is, is there an EEPROM that can be written to over I2C and then once it is setup can be controlled with some ...
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2answers
696 views

Ghosting on 7 segment display

I have an EEPROM (AT28C64B) multiplexed and connected to 3 seven segment displays, I did so using a tutorial online from ben eater https://www.youtube.com/watch?v=dLh1n2dErzE&t=300s Sorry for ...
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1answer
211 views

Do eeprom page writes always cost the same time as byte writes?

Some EEPROMs provide the possibility of a multi-byte write. For example, the AT24C provides an 8-byte page write besides the classical single-byte write. The datasheet specifies 5 ms as "Write Cycle ...
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1answer
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When to re-enable WP pin on EEPROM?

I am using STM32F4 microcontroller and 24AA512 EEPROM, which uses I2C to communicate with MCU. Like many EEPROMs it has W(rite) P(rotection) pin and I want to use it because why not. But there is one ...
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1answer
970 views

What are situations to use an actual EEPROM over using emulated EEPROM in flash?

I am using stm32 which offers EEPROM emulation on its flash. Given that an external EEPROM cost money, wouldn't using flash makes sense all the time? Currently, my use case is to store config ...
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3answers
950 views

Can probing an EEPROM with a multimeter corrupt the data?

Say there's an EEPROM on a board and you happen to try probing the pin one by one with a multimeter, is there a good chance that the sequence of probing the pins must have overwritten (thus corrupt) ...
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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
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EEPROM or SD card storage for a general logger application?

If you need to store data, let's say numbers (one byte each), and you need a capacity for at least 100,000 readings in a low power sensor (3.3 V and less than 20 mA in stand-by operation), ...
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1answer
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How do I read I2C memory with an Arduino?

I have HH100D humidity sensor. It outputs a frequency signal, which I know how to handle. However, it also has a small EEPROM with calibration values that is available via I2C. Those values are ...
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How to store the last counting value in EEPROM in ATmega8 after power failure

I written a program to store the last counting value according to ATmega8 datasheet. but it didn't save the last value. The counter variable went to zero after power failure. Please check the ...
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2answers
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How to repeatedly read and write a SMD EEPROM without unsoldering it each time?

I am doing a lot of reverse engineering on SOIC-8 Eeproms in automotive ecus. At the moment it requires unsoldering the chip, read/write, solder the chip back in, test, repeat. Most Eeproms have to ...
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2answers
271 views

I2C EEPROM endurance

I am using an AT24C32 I2C EEPROM device as a simple storage unit for recording slow analog voltages. I am writing the data byte-wise, no pages. Every write cycle takes 10ms to complete. The data ...
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2answers
860 views

ATMEL 24C02 EEPROM - Trouble understanding how the addressing works

I am currently writing a library for ATMEL's 24C series EEPROMs (not a programming question). The library works fine with a single EEPROM at the moment and I am trying to support multiple EEPROMs now, ...
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#define EEMEM __attribute__((section('.eeprom')))

After long time investigation, I could not find proper information about "#define EEMEM attribute((section('.eeprom')))" macro on eeprom.h header file. I want to declare variable exactly at address ...
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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
448 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] : https://drive.google.com/file/d/...
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1answer
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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
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Reading EEPROM memory (Winbond W25M02GV) with FT4222H USB bridge

I would like to read an EEPROM Memory (SPI Flash Winbond) using an FTDI USB/SPI bridge (FT4222H). I developed a c++ application that connects to the FTDI and reads data from the memory(and using the ...
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314 views

Problem with writing eeprom memory

I am trying to write atmel at28c256 on breadboard so I tied all address lines to ground, and all I/O lines also tied to ground. I untie I/O lines for reading, tie 'WE to high, 'CE to low, and 'OE to ...
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111 views

EEPROM in Simulator for Microchip Pic18f

When programming a Microcontroller from Microchip using Pic18F and using XC8 Compiler, can i use Simulator to test / verify it ? ...
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Why is so8 test clip causing read errors with 93C56 eeprom (TL866 programmer)?

I am trying to read an Atmel 93C56B eeprom, so8 surface mount package, with this programmer. When using the so8 adapter in the zif socket it works perfectly. However when I use the test clip, it is ...
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1answer
3k views

PIC EEPROM after re-programming

I was trying to get my EEPROM read/write working on my PIC. I first programmed a write cycle, and then reprogrammed it to read it out. (To avoid writing every time I start the program/pic) But I ...
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Do different address spaces exist for RAM and ROM in a typical microcontroller? [closed]

If a microcontroller has 16 bit address space from 0000H to FFFFH, will the RAM, I/O registers, memory mapped I/O and ROM(Flash/EEPROM) share the same address space linearly, or will there be a ...
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Why use RAM IC over EEPROM IC?

I have been looking at various different external storage ICs that would work with an arduino. When I looked at the specs of some EEPROM chips and compared it to the specs of other RAM chips, I ...
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2answers
285 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 (...
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3answers
459 views

What's the difference between 24AA1025, 24FC1025 and 24LC1025

24AA1025: operates from 1.7V - 5.5V, 400kHz, $2.37 24FC1025: operates from 2.5V - 5.5V, 1 MHz, $2.37 24LC1025: operates from 2.5V - 5.5V, 400kHz, $2.37 See here. 24AA1025 is unique, because of the ...
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Looking for a way to re-program 16x2 LCD display EEPROM font

Some time ago I've seen this topic - asking where does the fonts stored in 16x2 (1602) LCD display. Does a 16x2 LCD display has its own EEPROM? I'm really interested in this, and didn't find any ...
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5answers
257 views

Undeletable EEPROM or other storage for micocontrollers?

Is there such thing as permanent EEPROM storage? The data written should be un-deletable. Once written it should be there as long as the chip is not destroyed or damaged. Any other alternatives to ...
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Breaking a 16-bit long int to write into eeprom?

I am writing data to eeprom AT24C16 using PIC microcontroller pic18f4520. Every address of this eeprom can hold 8-bits while I am using long int's to store data that are 16-bit in size. How to break ...
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Reading empty (new) AT24C16 I2C EEPROM - 0xFF or 0x00?

What byte vaule should I see when reading empty EEPROM chip via I2C?
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How to debug this I2C hard fault?

I am using an STM32F103C8T6, STM32CubeIDE with HAL. During accessing an LCD (1602), with I2C, I get a hard fault. I try to debug it, but somehow I don't see the stack. See the following screenshot: ...
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EEPROM page size

I have an M24C01-x EEPROM (1 KBit in size) driven by an STM32. The datasheet doesn't make it clear what the page size of that EEPROM is. I require it to properly configure the STM32 EEPROM driver. ...
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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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2answers
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Is it possible to use PIC10Fxx internal flash to store data between deep sleep?

I want to store a single bit with rare rewrite. It's possible for STM32 without EEPROM, but how about PIC microcontroller? And is there examples with configuration and code?
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1answer
399 views

Asynchronous write to EEPROM

There is Stm32l052 with built-in EEPROM (2k). 4 ADC channels are used, data is collected by the trigger every 40 microseconds. Data from the ADC is processed in the interrupt (determined by the output ...
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3answers
587 views

When should I write to EEPROM?

I built a simple project using an arduino to control a I2C digital potentiometer being controlled by a remote control via a IR Detector. The purpose is to be able to control the input signal of a ...
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1answer
369 views

Are EEPROM chips getting obsolete?

I am making a circuit with a microcontroller that has a periodic need to save about 500 bytes of information in a non-volatile storage. Running only on a supercap that might be charged up rarely, the ...
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1answer
361 views

eeprom overflow

I was using STM32f401RE,and i stored a series of numbers into the AT24c512, EEPROM read and write operations on several times during the implementation of the code is done, about 10,000 times each ...
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2answers
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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
121 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: http://ww1.microchip.com/downloads/en/DeviceDoc/...
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1answer
569 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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1answer
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Bit Bang to I2C EEPROM MSP430

I found some code to Bit Bang to an EEPROM on the MSP430 here, but if I change the pins to what is on my design it fails to read and write. I've also added a LED for output this should blink if it ...

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