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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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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231 views

Where can I find the EEPROM memory in STM32 Nucleo F401RE?

I'm looking for to store and read values on STM32 Nucleo F401RE and I need to find which sector and begin address to start with. I did watch a tutorial how to do, but he's using another STM32 board. ...
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Not able to read from EEPROM 25A512

I have been struggling some time trying to read data from my EEPROM 25A512. I'm using a STM32F407IGT to access the EEPROM via SPI, but no luck reading or writing. The SPI is configured using CUBE MX ...
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Validation of data in electronics

Suppose, I have data which is stored in some EEPROM memory. The EEPROM is connected via an I2C interface to a microcontroller, and this microcontroller is connected to an RF receiver circuit. Assume ...
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3answers
11k views

How to properly use STM32 flash memory as an EEPROM?

I have to save certain parameters to the flash memory and these values should be non-volatile. But my program will change these parameters and I want the changes updated to the flash. I understand to ...
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435 views

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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1answer
112 views

Simulation / Emulation of an I2C EEPROM MEMORY (M24LC16B)

I'm using iBurner3.2 I2C Bus EEPROM Programmer to write and read from an I2C EEPROM MEMORY (24LC16B) using COM Port, I want to simulate the behavior of this specific I2C EEPROM, is there any software ...
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43 views

Using Raspberry Pi to write to an EEPROM

I've been trying to use a Raspberry Pi as an EEPROM programmer, and I haven't had much luck. The EEPROM in question is the AT28C64B, and I have yet to be able to write anything to it even manually. I'...
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1answer
72 views

Interface USB and SPI flash (Boot PC from SPI)

Basically I am looking for a way to boot a PC from SPI flash. I'm talking about average AMD/Intel desktop mainboards. BIOS is already on SPI, but I need a way to also put the kernel and maybe initrd ...
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1answer
53 views

EEPROM converted to DRAM?

Can we use a EEPROM cell for DRAM ? simulate this circuit – Schematic created using CircuitLab This is an EEPROM cell. Can we use multiple cells of this type to create a DRAM?
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2answers
70 views

What happens with a parallel EEPROM data bus when the address is changed?

I have a parallel EEPROM chip (AT28C256 to be precise). I keep the OE and CE lines low. Some address is set at the address bus. What happens on the data bus when I flip one address bit? Does it ...
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3answers
113 views

EEPROM with counter [closed]

I want to have and EEPROM with the address connected to a counter. For my purposes, this(https://eater.net/datasheets/28c256.pdf) EEPROM will suffice. However, I need a counter to go along with it. I ...
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ft24c02a EEPROM Raspberry Pi I2C issues reading

I have a digital scale that I am trying to take apart and feed the weight into a raspberry Pi. The digital scale has a FT24C02A EEPROM that is I2C enabled. I am guessing that the weight is calculated ...
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1answer
105 views

EEPROM returns 0 while trying to read anything

I'm using a CC2652r to try to read and write to an MX25R8035F EEPROM using SPI. I'm using the build in SPI driver to try and communicate with the EEPROM but while the drivers says it succeeded the ...
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1answer
862 views

Why dummy Write in I2C Read operation? [closed]

Why do you need to write nothing to an I2C component before reading from it? In a AT24C128C, for example: A Random Read requires a dummy byte write sequence to load in the data word address. I am ...
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2answers
1k views

Single I2C EEPROM 24C02 uses all eight addresses by itself

I was scanning for a used address by I2C EEPROM (24C02). Contrary to my expectations, it returned all eight possible addresses (0x50-0x57) instead of the hardwired one. I thought the problem was in a ...
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4answers
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Why is my program stored in flash memory instead of EEPROM in ATmega328?

As I was going through the differences (basically they are same, but they still have some differences) between flash memory and EEPROM here, I figured out that the flash memory can handle lesser ...
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1answer
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Arduino EEPROM store multiple data

I just need a small help to completed my project. As my output is printing 2 result but only 1 output is saving to the eeprom. How can I save multiple data into eeprom? I'm just showing the setup and ...
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1answer
547 views

STM32L0 Hangs on writing EEPROM

I've got an STM32L073RZ and I'm attempting to write a 4 byte value to the internal 6 KB EEPROM. I'm running MbedOS 5.11.4 but attempting to use the HAL for this. Here's the code: ...
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1answer
315 views

EEPROM Read Operation Always Returns 0xFF

I'm working with a AT24C04 EEPROM which communicates with a LPC1768 MCU on a I2C bus. I try to write a 8 bit data (0xF0) on the 0x00 Address of the memory but when I want to read the content of this ...
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0answers
54 views

PIC16F7X I2C Issues With 24AA01/24LC01B EEPROM

I have an existing PCB that is no longer supported by the manufacturer and has been plagued with software issues for years. So i don't have much control over how the board is laid out and what ...
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1answer
606 views

Winbond W27C512 EEPROM erasing/writing

I got these EEPROMS lately and I want to use them for other projects, so I need to erse/write them. I have Arduino Mega, powered by 12V power adapter and I am creting a shield with ZIF connector for ...
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7answers
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Can we not simply connect a battery to a RAM to prevent data loss during power cuts?

So, I was just wondering about how volatile memory storage loses data when the power to them is cut off. But can we not solve that problem by using a battery in conjunction with a RAM and a ROM and ...
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2answers
423 views

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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1answer
390 views

Combine two 8bit EEPROM to make 16bit EEPROM

I am working on building a computer out of logic chips. I want to use an EEPROM as the instruction memory. However, my EEPROM's only has 8bits data output, but I want my instructions to be 16bits long....
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2answers
79 views

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
70 views

Adapt EEPROM EMULATOR STM32F103VE

I'm working with STM32F103VE and STM32F746, and i want to use my Flash memory as EEPROM EMULATOR for writing and reading data easily. I have searched for axemples of Emulation of EEPROM for my board ...
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1answer
789 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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126 views

Why bad data is read from SPI Flash

I have a device in which there is a SPI flash and a I2C EEPROM, W25Q256JV (32MB) and AT24C1024 (1MB) respectively. The MCU writes data packets in the flash fifo and saves its read write pointers in ...
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1answer
747 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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2answers
80 views

Are there any Programmable ROMs, that don't need specialist hardware to program [closed]

I have an idea for a digital circuit. It needs a ROM, one that I can use on bread board. I have no programming hardware (I have RS232 serial, I²C, I may at a stretch be able to get hold of an Arduino ...
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8answers
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Why is serial EEPROM preferred over parallel EEPROM?

In the wikipedia page for EEPROM: http://en.wikipedia.org/wiki/EEPROM it is given that "Parallel EEPROM devices typically have an 8-bit data bus and an address bus wide enough to cover the complete ...
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2answers
269 views

How is the common anode 7-segment display in Ben Eater's setup working?

First question in this community, and I'm a beginner when it comes to circuits. In Ben Eater's video on using an EEPROM for combinational logic, he uses the output of an EEPROM to drive a common anode ...
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1answer
161 views

How is an EEPROM different from a Flash memory? [duplicate]

I am trying to understand the terminology used for various non-volatile memory chips for example as EEPROM and Flash. Is there any preference to use the word EEPROM or Flash for specific type of ...
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1answer
148 views

Help understanding table in SAM E54 Datasheet

I apologize if this isn't the right place to ask this question, but I'm having trouble interpreting a table in the SAM E54 datasheet. I am trying to configure the size of the SmartEEPROM on an ...
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1answer
199 views

What's the difference between 1kb(64x16) and 1kb(128x8) for EEPROM memory size?

In addition to the question in the title, I have the following subquestions: I'm guessing 64x16 means something like 64 cells of 16 bytes each. Is this accurate? What is the significance (if any) of ...
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1answer
595 views

Put saved data in flash of STM32 at the end of all other sections

I want to emulate EEPROM over flash of STM32F103. Is there a way to use all free flash instead of the only page? How can I initialize starting point of my EEPROM emulation so that it would be after ...
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3answers
170 views

DALI Commissioning reduction

Is there any way I can reduce the DALI commissioning? I have an Occupancy sensor, photo sensor and a switch which are DALI devices. So every time when I turn on the device it goes for commissioning ...
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0answers
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How to program i2c eeprom by hand?

I have a 24c02 eeprom and I want to program it. But I don't have Arduino or any microcontroler. I saw a video about program eeprom by hand, but they are parallel eeprom. This is the link of that video:...
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5answers
2k views

I2C EEPROM bit-banging: Writes fine, but only if first bit is not set

I am currently working on an I2C EEPROM project using bit-banging to drive the SDA and SCL lines. My read function works fine but whenever I write any byte with a leading "1", I always read FF back; ...
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107 views

Is normal SPI device compatible with SPI I/F?

Audio controller AK5374 that I use requires EEPROM with SPI. However, in the specs it is written, that it communicates with EEPROM via SPI I/F. Will normal EEPROM be compatible with this interface?
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270 views

Disable writing to Winbond EEPROMs

A common type of EEPROM used in computers is the Winbond chips, such as W25X10A, W25X20A, W25X40A, and W25X80A. The datasheet for these chips can be found on Datasheet archive. It was not clear to me ...
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1answer
182 views

Home-brew cpu ram

I’m trying to build a cpu out of ttl logic chips. I’ve just about got everything finished, however, I’m still working on the ram. I don’t have any suitable ram chips I can use, however, I do have a ...
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EEPROM and Flash testing

I am looking into the best practices for EEPROM and Flash memory testing. We are talking about end of line product testing by an ATE. The goal is to identify defect chip before writing memory content. ...
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4k views

Why isn't there any EEPROM in STM32F4 MCUs? [closed]

Why isn't there any EEPROM in the STM32F4 series MCUs? Mostly I have Microchip MCUs and they have EEPROM available in them, but I just found out that it is not available in the STM32F4 MCUs... And it ...
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1answer
159 views

eeprom driver code c++ overlapping

im trying to write driver for EEPROM (24LC64): page size: 32 byte capacity: 8KB (64Kbit) definition code: ...
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82 views

eeprom endurance and life expectation

Imagine the following situation: 'considering that we have the environment of room temperature ..' EEPROM size: 512 byte. EEPROM endurance: 100,000 write cycles logging data: 4 bytes every 3 minutes. ...
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2answers
4k views

28C64 EEPROM Programming Using Arduino

I am working on a Z80 computer and needed to write data to an EEPROM. I am using the Xicor 28C64AP-25 chip (datasheet). I wrote a program for the Arduino Uno that writes data to the first 4 addresses ...
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1answer
147 views

Why is one of the transistors in ROM sense amplifier twice the width of the one opposite of him?

The picture is of Sense Amp design of ROM component in which a 'dummy' bit line is used to imitate the current so that the proper information can be derived from the memory cell by comparing the ...
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1answer
396 views

I2C-ATMEGA328p as Master and 24LC256 as slave

So i am trying to establish a connection between ATMEGA328p as Master and 24LC256 EEPROM Chip using I2C protocol. Clock is set to 100KHz SDA and SCK lines are pulled up to Vcc using 4.7K Ohm ...

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