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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59 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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287 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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542 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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264 views

Will my decimal to binary converter work

I got into electronics recently and I hope to make a 8 bit ripple carry adder with a decimal input and output. This input is the first schematic I designed from scratch without a tutorial to go off ...
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109 views

How to prevent SOIC8 clip from backfeeding

I'm trying to read the flash ROM using a SOIC8 clip, on board. I am horrible at surface mount soldering. Is there a way to use the clip on the board, without removing the chip, and not have the SOIC8 &...
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770 views

What data is stored in an eeprom that’s not in the flash memory? [closed]

I’m wondering generally what information is stored in an eeprom that’s different than what’s in the flash drive that contains firmware? Mostly in mobile devices. Does the eeprom contain user settings ...
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70 views

What Happens if a Device Is In a Device Tree but Not Physically Present

Probably a very newbie question: I have a Zynq 7100, zc706 board. I am playing around with the ARM Processing System with Xilinx's PetaLinux distro. What would happen if I added a device to the ...
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406 views

are 100K resistors too weak for connecting HC to cmos?

I have created two identical circuits. The only difference between them apart from the number of lines on the LCD is that the old circuit uses 10K pull-up resistors instead of 100K pull-up resistors. ...
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801 views

Purpose of Pullup Resistor for Active low pins in EEPROM

I am working with a 25LC640A EEPROM, which is having active low control Pins like CS,Hold,wp (Write Protect). I have Connected Pull up Resistor for CS only alone. Its working fine. Please refer the ...
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261 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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359 views

Using EEPROM insted of flash in AVR?

I am writing one AVR Mikrobasic Program which my Atmega32 flash memory is fulled. Can I use EEPROM space for saving my functions routines instead of flash memory for releasing some space of flash ...
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480 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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913 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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2k views

EEPROM Reading/Writing without Use of Programmer

I am designing a small password based door lock project which is fully made from logic gates and ICs without the use of any sort of programmable devices(it is a simple university project for the Logic ...
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178 views

Decoding ADC pin labels

I'm about to buy a parallel ADC to connect to an EPROM in a analog-digital circuit. I've found some potential ADCs but am having trouble deciding if the ADC and EPROM are compatible. A bistable ...
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149 views

EEPROM address definitions and delay

I am using 24LC256 EEPROM which have addresses from 0x0000-0x7fff. But I would like to predefine certain address from EEPROM to specific tasks, like from 0-100 for task-1 and so on. Does predefining ...
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386 views

25AA320A EEPROM byte write and page write

I need to write data into my external EEPROM 25AA320A using Attiny2313. I know how to write one byte at a time. For example, spieeprom_write (200, 7); with 200 being the starting address on EEPROM, ...
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99 views

Can I replace an AT28c17 with a CAT28c65B without changing my software?

The AT28c17 is a 16k e2prom while the CAT28c65B is 64K bit e2prom and both are in a 32 pin PLLC package. They have 10 adresss lines with the only difference being the AT28c17 has A0-A10 adress lines ...
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259 views

Ardupilot, atmega1280 and barometer

I'm working on a project and I need to know where the information taken by the barometer sensor are stored. I think in the eeprom, but exactly where? Is there a specific address or register memory? ...
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210 views

how to use TMP87P809N microcontroller with any EEPROM

How to use TMP87P809N with any EEPROM so that I can save timer counting of CMOS RAM in EEPROM for backup, I want to save that counting if electricity get failed and restart.
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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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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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80 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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40 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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49 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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43 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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42 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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51 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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2answers
52 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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42 views

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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104 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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94 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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197 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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80 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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228 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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78 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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78 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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2k views

Automotive ECU Flash and EEPROM memory mapping

I'm trying to access data stored in the eeprom of an automotive ECU and I'm short on experience. My question is how flash and eeprom are mapped and accessed by the micro. I haven't looked at the ...
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228 views

Reuse a S25FL256S SPI 32MB flash module even when it is possibility protected?

This is my weekend toy, a Spansion/Cypress fl256saif00 (S25FL256S), a 32MB SPI module. This chip is salvaged from a Cisco EPC3928 Docsis 3.0 Modem Router (2012). The (first) challenge was to be able ...
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574 views

Can I read EEprom in circuit when connected to a SH7055 MCU?

I am trying to read a microwire 93C66 EEprom which is connected to a Hitachi SH7055 MCU. The device is a complete automotive ECU. I need to be able to do this in circuit. Currently I get an error ...
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196 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
47 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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221 views

Algorithm for testing EEPRM

What are the steps or the algorithms to verify that an EEPROM is working ? Right now I just write 10 bytes and I read 10 bytes from 10 addresses, and that's naïve approach. Is there an algorithm or ...
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589 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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159 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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413 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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2answers
843 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
602 views

EEPROM 93C66 dummy bit problem?

Could someone please explain the reason why the 93C66 EEPROM outputs a dummy 0 during a read operation? From datasheet: 5.1 Read Data from Memory The Read Data from Memory (READ) ...
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1answer
577 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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223 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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