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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462 views

Steps for testing external flash memory [duplicate]

I have a blackfin 533 and I connect it with external flash memory. I have a software driver that erases a block, fills data, write to flash memory. I'm using the following chip ST M29W800D. How ...
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1answer
103 views

Why do parallel memory chips in a DIP package have a disorganized pin arrangement? [duplicate]

I'm looking at datasheet for old RAM's and EEPROMS, and one in particular I'm using is part AT28C256. Why is it that the order of the address lines do not correspond with the actual pin number. An ...
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1answer
1k views

How to test flash memory

I'm using blackfin533, and I would like to write a software for flash memory testing. How would I test the flash memory ? I know how to test an eeprom but how would I test the flash memory of the ...
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1answer
295 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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1answer
160 views

How to count EEPROM wear cycles when flipping an address back and forth?

I'm trying to determine the life of some EEPROM. I will be erasing a byte (setting to 0x00, clearing a parity bit) as frequently as I will be writing to it. So if setting it to 0x00 counts as a wear ...
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81 views

Reading from EEPROM problem [closed]

I write a structure into EEPRM as follows ...
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1answer
47 views

Programmatically verifying EEPROM pins connected

I can't find really much about it online, but am curious if there is any bit-fiddling like tricks to verify all pins on a EEPROM are properly soldered/connected (particularly address pins on a ...
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3answers
6k views

Flash EEPROM Emulation

Given that there are many differences in the way data is written to EEPROM and Flash, how exactly is EEPROM emulation done with internal flash? Also, flash needs to be erased in large blocks before ...
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2answers
167 views

What happens when a microcontroller does continuous read openration on an EEPROM IC?

I am currently doing testing on a product. The pcb consists of an EEPROM IC AT93C46. I connected the Oscilloscope probe to the Chip select pin, Clock, Data In and Data Out. From referring the wave ...
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2answers
156 views

Is there a such thing as a UV EPROM whose contents cannot be burned unless the UV-sensor is uncovered? [closed]

Is there a such thing as a UV EPROM whose contents cannot be burned unless the UV-sensor is uncovered?
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146 views

Problems programming a 29GL256

I've been experimenting with Python scripts and using an Teensy 2.0 ++ to program different flash memories. So far I've found a script to program a 29GL128, which works perfectly, but I'm trying to ...
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2answers
294 views

Can't write data in for 24c256 eeprom?

I am using Pic24fj128ga202 microcontroller and 24c256 eeprom and ISL1208 RTC which is interfaced through I2c bus. The problem is i can able to read and write the data in eeprom and RTC ,but on some ...
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1answer
652 views

EEPROM Emulation driver does not work when Page Sizes are 2KB

I am trying to implement EEPROM Emulation on an STM32F07x using the driver supplied by ST. Problem is on attempting to initialise the emulated flash, the driver fails and always returns NO_VALID_PAGE. ...
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103 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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8answers
8k views

EEPROM is a “Read Only Memory,” so why can I write to it?

Electrically Erasable Programmable Read-Only Memory (EEPROM): If it's using Read-Only Memory (ROM) then how am I able to write to it?
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0answers
90 views

EEPROM for PXIe card [closed]

I am working with an home made PXIe card. The PXie controller is a PEX8311. The EEPROM used to save name and configuration registers is a 93C66. I need more user space to save calibration data and ...
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1answer
3k views

SPI data storage devices: (micro)SD card, DataFlash, or serial EEPROM?

I am revisiting some of my design habits, and one of them is under serious scrutiny: the go-to SPI-based storage device is (micro)SD cards, for their price-to-capacity ratio and generally higher ...
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5answers
236 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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2answers
11k views

USB, UART, SPI difference and usage? [closed]

I am trying to enabling an embedded system built around Intel D1000 MCU. I am mainly from a software background and just starting to catch up with some hardware knowledge. I am trying to build ...
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1answer
503 views

DS2431+ EEPROM Toner cartridge Information

I have an Toner Cartridge with EEPROM of model DS2431. I am able to read the bit data from the eeprom using Arduino OneWire library. I am also able to write to the eeprom. But when I write to it I ...
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0answers
135 views

EEPROM vs NOR Flash [duplicate]

I came to know that EEPROM of these days are nothing but NOR Flash. How true is this statement? In case if it is true, why is still there a distinction between flash and EEPROM when we talk of memory ...
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2answers
874 views

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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1answer
132 views

How does information gets stored into EEPROM?

How does information gets physically written to an Arduino Uno EEPROM ? Is each bit of information in fact a small condensator which fills and retains its charge even when the Arduino is powered down ?...
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1answer
859 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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1answer
378 views

Atmel SPI Serial EEPROM Writing Error - Page Write?

I'm using this EEPROM: Atmel AT25640B SPI EEPROM DATASHEET It seems pretty straight forward to operate and I've followed the datasheet closely when coding my driver. I seemed to have some success ...
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1answer
235 views

DIL IC for simple non-volatile memory [closed]

Can anyone suggest a DIL IC where I can store a couple bits of memory without having to use a complicated interface like serial, I2C, and etc. I want to be able to store at least 2 bits of memory to ...
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2answers
746 views

FreeDSP (ADAU1701) isn't working - what is the issue?

I had FreeDSP PCB soldered recently and for the last two days I've been struggling to make it work. FreeDSP basically consists of ADAU1701 DSP, 24LC256 EEPROM, 12 MHz oscillator, IO circuits and ...
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1answer
118 views

Microcontroller reset

I am facing a problem of micro controller reset, I am thinking of implementing the following to find the function in which it happens, then the root cause. As soon as I enter a function I will ...
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2answers
2k views

EEPROM reading and writing

It is known that there are limited read and write cycles for EEPROM. Suppose I keep writing some important information in EEPROM and read it after power off to ON. Suppose at some point of time the ...
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3answers
357 views

What is the difference between a Micro-controller and a EEPROM? [closed]

What are the tasks Micro-controller are used in, compared to EEPROM? Also for a simple Arudino, is ATmega328 the micro-controller or EEPROM?
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1answer
418 views

How to connect multiple AT28C256/AT93C256/AT24C256/24LC512 EEPROMS to have more space

I want to have more memory say 1 Mega Byte, But I don't know how to connect multiple EEPROMS either in series or parallel I would like to use either AT28.... or AT93.... or AT24.... series Also ...
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4answers
169 views

Best value to overwrite old to tell if memory is not used on eeprom

I have an EEPROM I want to store CRC32 hashes on between 0x0000 and 0x008C. In this range I need a way that I can erase one of the hashes and overwrite its bytes to a default number. By doing this I ...
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1answer
1k views

What is needed to store readable/writable data to flash/eeprom [closed]

I am wanting to add some readable/writeable memory to my ATmega8/attiny project where I can store data, recall the stored data, then overwrite the stored data. The stored data must be able to be ...
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1answer
227 views

PIC C program flow problem XC8

Problem: My C code is not running to the end. To test my EEPROM read and write, I decided to write a simple array and read it back to different array using a PIC. However the problem is not the ...
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0answers
785 views

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 ...
3
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1answer
218 views

How are system configuration flash or eeprom chips programmed?

I've seen, quite often actually, a circuit that will have an eeprom or flash chip soldered next to the application chip. Take a look at the ESP8266, it has some kind of programmable memory that sets ...
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2answers
672 views

Reading image, sound, binary file from nonvolatile memory for FPGA

For applications that require design on FPGA which shall make use of several image files, sound files or other forms of files, can they be simply included in the FPGA design configuration file? In any ...
2
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3answers
673 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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1answer
621 views

What is the purpose of SRAM in the DS1307 RTC chip and the onboard AT24C32N EEPROM chip??

I am going to interface a RTC to PIC18F and before doing so, I'd like to clear some doubts regarding the module and its connections. I am using the "Tiny RTC" as shown in this link!. The following ...
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1answer
480 views

Why there are AC timing characteristics but not DC in I2C interfaced chip?

I'm quite newbie in electronics, and I'd like to learn why there are AC timing characteristics to this particular EEPROM (24LC512) that I'm using but none for DC? Does AC timing constraints apply to ...
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2answers
1k views

Primary diff between EEPROM and Flash mem, in terms of code memory

In terms of storing program commands, what is the definable difference between EEPROM and Flash memory? Also, in this particular context - For a personal project developing audio codec using TI ...
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1answer
268 views

ATmega48PA power consumption during EEPROM write

PLEASE, PLEASE! My question is about power consumption of the CPU during EEPROM write NOT about the power supply! PLEASE! Thank you! I have a device (ATmega48PA) powered through a 150k resistor ...
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2answers
911 views

Is it possible to generate a functional EEPROM (with persistence) inside an FPGA/CPLD

I'm looking to implement a small persistent 'configuration space' parallel EEPROM within a design. However, given the volatile nature of FPGAs, this doesn't seem possible without some very clever ...
3
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1answer
192 views

How easy to indentify memory like ROM or EEPROM Flash Memory Areas of a Chip

Can anyone tell me would the memory circuit areas (ROM, EEPROM, SDRAM, Flash Memory) of the layers of a die belonging to a MCU and SoC IC's be relatively easy to identify compared to identify circuit ...
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2answers
523 views

Why fram instead of eeprom

Why do all the gameboy cartridge mods for nonvolatile save use a type of ram like fram? Why isn't a sufficiently fast eeprom or flash ic used? EDIT: We all know this is about parallel interface ICs, ...
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1answer
937 views

disable write protection in eeprom

I'm working on pic24fj128ga202 microcontroller. My pic is interfaced with eeprom via I2C. I can't write and read on eeprom(BR24G256), then I read the datasheet of eeprom and came to know that there is ...
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1answer
990 views

Unknown SOT-23-5 I2C device

I have a small board that stores some static and dynamic data: cc 80bytes of serial number, manufacturing date and a counter. The board has two SOT-23-5 components: one is with CBOCX and one is with ...
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2answers
821 views

EEPROM writes/reads wrong bytes

I am using M95512-W M95512-RM95512-DF eeprom for storing my data. But sometimes it's not storing bytes I want. Instead of it, it's storing successive (wrong)bytes. ...
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3answers
2k views

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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1answer
349 views

How to find which one is master/slave? - PIC

Im using PIC24FJ64GA002 microcontroller interfacing with EEPROM(24C256). EEPROM's SDA and SCL pins are connected with respective PIC24F I2C1's SDA and SCL. All other pins of eeprom are grounded. Here ...