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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30 views

Using EEPROM for transceiver data communication in Tx and Rx mode?

I am planning to use EEPROM (ST-M95640-DF) in between Transceiver IC (ST-S2LP) and the MCU (STM32L152RE). I would put program commands in a read-only section of the EEPROM to be accessed easily. Now ...
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2answers
188 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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0answers
32 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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1answer
26 views

Can i Increase the NFC range upto 50cm by making a bigger antenna? i only want to write data into a NFC enabled EEPROM?

As NFC are active upto 15cm range, i/m using a PN532 to write data into a NXP NFC enabled EEprom, which is successful, i want to increase its range by 2X by increasing the Power or size of Antenna for ...
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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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2answers
55 views

Why is my EEPROM not working?

I have a 24FC01, 1 kbit EEPROM on my board. The SDA and SCL lines are pulled up to 3.3V through two 2k resistors. I'm using a STM32F407 MCU to read and write data to the EEPROM. Using the HAL ...
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1answer
51 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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4answers
74 views

Flash or EEPROM

EEPROM vs SD Flash I am working on a Arduino program (a game, a slot machine) that needs to store 16 bitmaps (the slot machine symbols) that are 32 * 16 bytes each (total 8192 bytes). The bitmaps are ...
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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
34 views

What is the internal i2c address to CAT24AA16-D

I am interested in using this eeprom for a project. I have used used I2C devices before and usually the datasheet gave the embedded address somewhere. For the life of me I can't seem to find it on ...
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1answer
1k views

The difference between storage patterns in RAM or SD cards from EEPROM [closed]

I have used EEPROM to store data in embedded systems. I would like to know about the pattern of RAM and SD cards which were used to store data. Is it that complex in terms of using RAM or SD cards? I ...
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608 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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How can i find the AT24C256 reg_addr?

For i2c to eeprom (at24c256) how can I find the device address and register address? ...
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1answer
39 views

IC replacement 24LC16B-I/P

I apologize for my ignorance, but does a brand new IC need to be programmed or are they already factory programmed ready to be solder? I have an M-Audio 49 MIDI controller piano with a bad 24LC16B-I/P ...
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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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2answers
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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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2answers
666 views

How Many EEPROM Write Cycles Left in My EEPROM

I ordered some AT28C256 EEPROMs, but none of them were cleared, they all have some garbage programmed, probably from the last user. Obviously they're supposed to be clean and new. I wanted to ask, is ...
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1answer
177 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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1answer
43 views

AT24C32 as a replace?

i want to make this part of circuit . It uses 24AA32A IC. Can i use AT24C32 instead . im worry about A0, A1 and A2. my question : if i want to use 24C32 , to work exactly like 24AA32 i should not ...
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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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1answer
108 views

Reading EEPROM memory (Winbond W25M02GV) with FT4222H USB bridge

I would like to read an EEPROM Memory (SPI Flash Winbond) using an FTDI USB/SPI bridge (FT4222H). I developed a c++ application that connects to the FTDI and reads data from the memory(and using the ...
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2answers
2k views

How can I access more than 15 addresses of data from my 8 bit incomplete computer?

Last year I started researching upon how computers work, so I started making one, at least on paper last month, but I ran into a serious problem that isn't getting a satisfying answer from any article ...
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83 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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4answers
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Do EEPROMs lose their data over time?

For example 8x8 small image stored on eeprom will get corrupt over time? I've seen somewhere eeproms losing their data over time like vhs tapes.
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3answers
565 views

Can no-connect pins on EEPROM ever be connected to VCC or GND?

I created a circuit in which all the address inputs of an AT28C256 are connected to outputs of shift registers (74HC164). In the future I will do many of these circuits, however I haven't yet ...
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6answers
1k 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
228 views

EEPROM only retaining a value for a short duration

Background I have a product that includes an SPI EEPROM connected to a Microcontroller. Address 0 if the EEPROM contains what we call the status word. In production the value of the status word is set ...
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1answer
136 views

How does a CRC check work between a microcontroller and EEPROM?

I have communication between an EEPROM and a microprocessor over SPI and I want to take care of data integrity. Could you please confirm my below understanding? I have a data which I want to write in ...
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1answer
220 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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42 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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2answers
4k views

AVRDUDE: Write EEPROM bytes without file

Is it possible to write EEPROM bytes via AVRDUDE and an AVRISP mkII directly from the command line without needing an EEPROM file read from another chip? Kind of like how you can specify the fuse ...
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4answers
771 views

Possible to buy Atmega328p with programmed Flash and EEPROM?

I've recently upgraded my old project that goes to mass production (a pair of thousand pieces, pretty niche). Previously I used DIP atmega328p, which were manually programmed in China. I sent them a ...
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1answer
58 views

Problem in editing EEPROM of MLX90614ESF sensor , pic 18f4620 , I2C communication

I want to edit Tomax and Tomin in the EEPROM 0x00h and <...
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1answer
90 views

Increasing Address Lines [closed]

I have stumbled into a problem where I need more address lines in my eeprom, my eeprom only has 15 address lines and I need atleast 28 address line for my project. What would you suggest I do? I need ...
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2answers
53 views

Brown-out detection with an external clock ATmega1280

I'm using ATmega1280 with an external clock and I have some questions about the "safe operating area" for preventing EEPROM corruption with BOD. The external clock is: Crystals 14.7456MHz ...
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8answers
4k views

EEPROM being both “programmable” and “read-only”

Since it is called programmable, I tend to think that it should also be named with the write option. What is the deal here?
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1answer
102 views

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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1answer
185 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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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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5answers
85 views

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
10k 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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3answers
338 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
92 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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0answers
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
66 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
62 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
95 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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0answers
49 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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1answer
103 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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