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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84 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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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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49 views

pic18f4550 header file error

I am working on eeprom, i am getting the error as follow In file included from spi.c:65: C:\Program Files (x86)\Microchip\xc8\v2.10\pic\include\pic18f4550.h:1726:3: error: typedef redefinition with ...
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85 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
33 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
74 views

Secure storage of Data in external EEPROM

I am working in designing of a prepaid energy meter. One of the most things I should store are (private key, credit and cumulative energy). The private key is stored only once. The credit and ...
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7answers
11k views

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
131 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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31 views

Reverse Feedback protection in a RC circuit

I have been working on a model CPU build from LS TTL ICs for the past couple of weeks. I am going to give a little background here, during the prototyping I stumbled upon several intresting issues ...
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1answer
73 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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67 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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55 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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51 views

Designing a Carry lookahead unit using EEPROMs, creates osclillator

I have read something about CLUs (Carry lookahead units) and want to build one. I have settled on design using eeproms as adders ...
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66 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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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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1answer
96 views

Amtel ATtiny EEPROM partially erased on power cycle

I have a Digistump with an Amtel ATtiny85 MCU. I can flash the MCU's EEPROM with an ISP programmer no problem. The chip works fine, the bootloader runs and the user program executes correctly. ...
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127 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
97 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
77 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
136 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
307 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
98 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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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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148 views

Proteus Atmel EEPROM Simulation

Can somebody confirm me if Labcenter Proteus can simulate the EEPROM registers for the Arduino Atmel megaAVR ATmega328P, for the standard instructions EEPROM.put ...
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59 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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3answers
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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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34 views

Msp430 f5328 Eeprom data get erased when burn new firmware

Hi is there anyway I can do this? I need to have my serial number in eeprom. But the problem is my data has been erased when I burn new firmware. Is there anyway I can avoid this. Thanks
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1answer
253 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
148 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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123 views

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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3answers
2k 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
112 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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65 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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273 views

ENE KB9012 SPI protocol reflashing with parallel port

The story in short: I have a laptop which got bricked with a failed BIOS update, and it's ENE KB9012QF A3 KBC's embedded flash contents needs to be reflashed. Solutions I tried, but didn't work: ...
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1answer
111 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
348 views

Emulated EEPROM using STM32F030K6T6

I've got a project I'm working that is using an STM32F030K6T6. I've followed STM's example of emulated eeprom for the STM32F0xx microcontrollers, but am hitting a Hard Fault when the EEPROM_Init ...
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2answers
447 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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3answers
163 views

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
52 views

Is resistor needed to drive NPN Transistor from EEPROM

I am using this EEPROM in read mode: http://ww1.microchip.com/downloads/en/DeviceDoc/doc0270.pdf And am using this transistor: https://www.onsemi.com/pub/Collateral/P2N2222A-D.PDF I need my EEPROM I/...
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1answer
338 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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1answer
58 views

EEPROM Interface confusion with Address?

So im researching how to interface with a EEPROM Chip via I2C with an AVR (Still learning a lot of the interfacing). Anyways, the AT24C16 for instance (or that family of EEPROM) seem pretty popular. ...
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6answers
994 views

Can an EEPROM be one-time-programmable?

I'm confused, and I hope you can help me figuring out, what I misunderstood. I am not an electronics engineer, so bear with me :) I have a chip, from the engine control unit of a Toyota Yaris Verso ...
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1answer
87 views

Why do I need to read/write from/to EEPROM in embedded applications? [closed]

What is the usage of the EEPROM in embedded application? can you give me examples?
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2answers
1k views

Does a microcontroller fetch instructions in blocks?

It seems that the flash memory on most microcontrollers that stores the assembly code is NAND flash, which is only accessible on a per-block basis. Does the CPU has to fetch an entire block to execute ...
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1answer
169 views

One Wire, 1-Wire, SingleWire, SDQ — are they compatible?

There are at least three different manufacturers with "one wire" type memories: Maxim/Dallas has "1-Wire" Microchip has "Single-Wire" TI has "SDQ" Are they all compatible with each other? I'm ...
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2answers
85 views

Analog Bistable Memory

I am looking for a device which I do not know exists. I would like to store the state of a number of analog switches, perhaps driven by a D Type Flip Flop. I'd like to drive the flip flop and set ...
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1answer
81 views

Would a parallel EEPROM ever output a value that it does not contain?

I understand that when the address input to a parallel EEPROM changes from A to B, the output may show results that aren't the contents of either A or B, for a few nanoseconds. Are these spurious ...
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1answer
81 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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1answer
71 views

EEPROM 25LC1024 issue with PIC32MX OLIMEX board

I am trying to read the status register for the EEPROM following the instructions in this Application Note. I wanted to have the opinion of the community on the signals I am getting. They don't seem ...
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8answers
5k views

Saving data without a microcontroller?

Is there a way to save voltage data directly (without a microcontroller) to anywhere, like EEPROM, SDCARD, etc.? For example, I am using an MPX pressure sensor which gives 0V to 5V analog output. ...

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