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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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326 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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121 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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859 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 ...
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59 views

Writing an Array to EEPROM Problem

When I write an array to EEPROM and read it I always get 0xFF. I am writing in addres 0x0001 to 0x0005. The password I am entering is 1,1,1,1,1 saved in uint8 array ...
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93 views

Programming a AT28C64B EEPROM using an STM32F429

EDIT: For those who tried to help or have found this question via google, I managed to solve this issue just by adding a 1uF ceramic bypass capacitor to the breadboard. Thanks for the answers. I'm ...
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1answer
70 views

understanding data semantics and diagram

According to http://www.auto-diagnostics.info/pdf/ford_eectch98.pdf page 10, "The 8361 ROM chip contains 8k bytes of program memory plus 128 bytes of additional RAM." I found two diagrams ...
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71 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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59 views

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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184 views

Replacing SD card by using EEPROM

I am using the mbed platform and to be specific, NUCLEO L073RZ. To log data, I am using SDFileSystem.cpp that is officially supported by mbed (you can find the link ...
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165 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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461 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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218 views

Designing a Carry lookahead unit using EEPROMs, creates oscillator

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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1answer
678 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
63 views

PIC18 preserving EEPROM data during reprogramming

I am using PIC18f4550 microcontroller to store some data in EEPROM so that the data can be accessible after the power reset. When I reprogram the PIC with PICkit3, it seems to wipe out the EEPROM data ...
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35 views

Help identifying this chip

Can anyone identify this chip? It came out of a central locking kit fitted to my car. But I didn't get the keyfob with it. From what I can tell it's a Fairchild semiconductor. With the writing on the ...
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92 views

Help identifying I2C EEPROM - top marking H250 2GB 2

I have a Fujitsu server (PRIMERGY RX300 S8) with a failed I2C EEPROM on the front panel PCB. I would like to order the correct replacement components, but I am unable to identify the exact series/...
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54 views

24lc256 EEPROM page writing problem

I have a question about my EEPROM Project recently started. why there is a maximum of 16-byte is Writing into EEPROM in below code. when we able to writing 64byte into the single page using page write ...
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67 views

How to programming chip with TL866 even if not in the supported list of TL866 device?

I work at a textile company. We have a sensor header which is named USTER. The Uster device checks the yarn quality. If it detects any problem it cuts the yarn. In our company, we have 8x60=480 Uster ...
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82 views

Can I safely erase the EEPROM on my ATmega2560 by flashing a hex file where every byte is 0xFF?

I am updating the firmware on my 3D printer from Sailfish to Marlin and my chip is not responding to the erase command on my ATmega2560; but I am able to flash it: ...
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58 views

How to configure the FlexMemory of NXP Kinetis MKE18F to be used as an EEPROM to store data on System power OFF?

I was trying to configure the Flash module of NXP MKE18F512VLL16 MCU to be used as an EEPROM. I followed the attached application note from NXP(AN5338) "How to use FlexMemory as D-Flash and ...
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93 views

Can I use a 16bit memory with an 8 bit processor?

The address bus is typically a double octet wide (i.e. 16-bit), due to practical and economical considerations. This implies a direct address space of only 64 kB on most 8-bit processors This quote ...
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45 views

EEPROM chip always toggling bit when reading

I have a parallel EEPROM, the AT29C020 (doc: http://pdf.datasheetcatalog.com/datasheet/atmel/DOC0291.PDF) In order to read it I'm using an ATMega8535 as it has enough pins. At first I thought reading ...
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52 views

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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1answer
157 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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44 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
105 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
375 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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156 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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131 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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365 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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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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1answer
101 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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233 views

Microcontroller(Atmega16A) hangs in Stop method while communicating using I2C with Atmega16 and 24LC256

First of all let me say that I am a beginner in embedded programming. I am trying to do write/read using I2C protocol from 24LC256 EEPROM using Atmega16A. While debugging in Atmel Studio 7, I see I ...
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1answer
51 views

Power Fail Monitor and ADC measurement

In my AVR project, I need to measure input voltage (before buck converter), and check for power loss to quickly save some data to EEPROM. Measuring input voltage is just to display its value, but I ...
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1answer
670 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
456 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
181 views

Recording servo movements using pic with CCS C

Here what I am trying to do is control servo motor with a pottentiometer and record its movement using analog to digital converter and than play. I started with just moving the servo. To see which ...
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1answer
2k 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 ...