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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1k views

Do different address spaces exist for RAM and ROM in a typical microcontroller? [closed]

If a microcontroller has 16 bit address space from 0000H to FFFFH, will the RAM, I/O registers, memory mapped I/O and ROM(Flash/EEPROM) share the same address space linearly, or will there be a ...
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How does information gets stored into EEPROM?

How does information gets physically written to an Arduino Uno EEPROM ? Is each bit of information in fact a small condensator which fills and retains its charge even when the Arduino is powered down ?...
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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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430 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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1answer
278 views

DIL IC for simple non-volatile memory [closed]

Can anyone suggest a DIL IC where I can store a couple bits of memory without having to use a complicated interface like serial, I2C, and etc. I want to be able to store at least 2 bits of memory to ...
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1answer
626 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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1answer
139 views

Microcontroller reset

I am facing a problem of micro controller reset, I am thinking of implementing the following to find the function in which it happens, then the root cause. As soon as I enter a function I will ...
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2answers
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EEPROM reading and writing

It is known that there are limited read and write cycles for EEPROM. Suppose I keep writing some important information in EEPROM and read it after power off to ON. Suppose at some point of time the ...
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3answers
646 views

What is the difference between a Micro-controller and a EEPROM? [closed]

What are the tasks Micro-controller are used in, compared to EEPROM? Also for a simple Arudino, is ATmega328 the micro-controller or EEPROM?
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Inbuilt flash memory size not enough

I am using TM4C1230C3PMI controller from Texas instrument in one of my project. It has 32KB of internal flash, which is not sufficient for my application. Higher flash sized micro-controller are ...
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1answer
499 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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4answers
210 views

Best value to overwrite old to tell if memory is not used on eeprom

I have an EEPROM I want to store CRC32 hashes on between 0x0000 and 0x008C. In this range I need a way that I can erase one of the hashes and overwrite its bytes to a default number. By doing this I ...
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1answer
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What is needed to store readable/writable data to flash/eeprom [closed]

I am wanting to add some readable/writeable memory to my ATmega8/attiny project where I can store data, recall the stored data, then overwrite the stored data. The stored data must be able to be ...
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0answers
855 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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1answer
242 views

How are system configuration flash or eeprom chips programmed?

I've seen, quite often actually, a circuit that will have an eeprom or flash chip soldered next to the application chip. Take a look at the ESP8266, it has some kind of programmable memory that sets ...
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2answers
795 views

Reading image, sound, binary file from nonvolatile memory for FPGA

For applications that require design on FPGA which shall make use of several image files, sound files or other forms of files, can they be simply included in the FPGA design configuration file? In any ...
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3answers
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Can probing an EEPROM with a multimeter corrupt the data?

Say there's an EEPROM on a board and you happen to try probing the pin one by one with a multimeter, is there a good chance that the sequence of probing the pins must have overwritten (thus corrupt) ...
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3answers
938 views

I need to lock reading my mega328 flash but be able to write to the eeprom

I need to be able to prevent other from copying my program placed in the flash, but want to still be able to write to the EEPROM. I tried the lock bits by setting them to Mode 3 (0x3C). But that will ...
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1answer
741 views

What is the purpose of SRAM in the DS1307 RTC chip and the onboard AT24C32N EEPROM chip??

I am going to interface a RTC to PIC18F and before doing so, I'd like to clear some doubts regarding the module and its connections. I am using the "Tiny RTC" as shown in this link!. The following ...
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2answers
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Is it possible to generate a functional EEPROM (with persistence) inside an FPGA/CPLD

I'm looking to implement a small persistent 'configuration space' parallel EEPROM within a design. However, given the volatile nature of FPGAs, this doesn't seem possible without some very clever ...
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1answer
346 views

ATmega48PA power consumption during EEPROM write

PLEASE, PLEASE! My question is about power consumption of the CPU during EEPROM write NOT about the power supply! PLEASE! Thank you! I have a device (ATmega48PA) powered through a 150k resistor ...
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764 views

Why fram instead of eeprom

Why do all the gameboy cartridge mods for nonvolatile save use a type of ram like fram? Why isn't a sufficiently fast eeprom or flash ic used? EDIT: We all know this is about parallel interface ICs, ...
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disable write protection in eeprom

I'm working on pic24fj128ga202 microcontroller. My pic is interfaced with eeprom via I2C. I can't write and read on eeprom(BR24G256), then I read the datasheet of eeprom and came to know that there is ...
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1answer
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Help identifying this chip (EEPROM?)

I have a circuit board from a Stratasys UPrint SE filament cartridge, and I'm trying to talk to the EEPROM on it. This board is unlike other Stratasys boards that I've seen people hacking with, and ...
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3answers
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What's a good EEPROM replacement for a 27C256/29C256? [closed]

I teach a hands-on computer architecture course in which the students burn their programs onto an EPROM with a commerical PROM burner. The instructions are read by a low-speed TTL computer they build....
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966 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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3answers
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Why use RAM IC over EEPROM IC?

I have been looking at various different external storage ICs that would work with an arduino. When I looked at the specs of some EEPROM chips and compared it to the specs of other RAM chips, I ...
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1answer
366 views

How to find which one is master/slave? - PIC

Im using PIC24FJ64GA002 microcontroller interfacing with EEPROM(24C256). EEPROM's SDA and SCL pins are connected with respective PIC24F I2C1's SDA and SCL. All other pins of eeprom are grounded. Here ...
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PIC32 and I2C EEPROM interface problems

I am writing code for a PIC32MX250F128B to interface with the Microchip 24LC02B EEPROM with I2C interface. I have followed the datasheet of the EEPROM, the PIC32 and section 24 of the PIC32 family ...
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1answer
437 views

Check content of EEPROM during run-time like Visual Studio

In Visual Studio, when we try to read memory location, we add breakpoints and run step by step to see what is getting read or written to a memory location. Is there a similar way, we can do it in ...
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4answers
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ATmega328p and USB conection to PC

I posted the same question on StackOverflow and I was redirected here. For my project I need to be able to program the eeprom of an Atmega 328p via an USB to PC. I tried to incorporate an USBasp ...
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616 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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Why do most of the non-volatile memories have logical 1 as the default state?

I have used non volatile memory, like EEPROM and FLASH memory, in embedded applications and I have always found that unused memory (EEPROM/FLASH) bit locations are always set to ...
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1answer
590 views

Where to find PIC library functions? [closed]

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3answers
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Breaking a 16-bit long int to write into eeprom?

I am writing data to eeprom AT24C16 using PIC microcontroller pic18f4520. Every address of this eeprom can hold 8-bits while I am using long int's to store data that are 16-bit in size. How to break ...
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1answer
476 views

Number of address in AT24C16 EEPROM or is it duplicate?

I am working on EEPROM AT24C16 for a particular project. According to the datasheet it must have 2048 addresses and I should be able to write 1024 unsigned int into it [ 1 unsigned int per 2 addresses]...
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2answers
6k views

Interfacing PIC18F4550 with I²C EEPROM (24AA1025)

I am working on a university project in which I need to interface a PIC18F4550 with an I²C EEPROM. I read many codes and saw many projects on this topic. And I wrote a sample code from MPLAB C18 (and ...
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2answers
278 views

I2C EEPROM endurance

I am using an AT24C32 I2C EEPROM device as a simple storage unit for recording slow analog voltages. I am writing the data byte-wise, no pages. Every write cycle takes 10ms to complete. The data ...
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2answers
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#define EEMEM __attribute__((section('.eeprom')))

After long time investigation, I could not find proper information about "#define EEMEM attribute((section('.eeprom')))" macro on eeprom.h header file. I want to declare variable exactly at address ...
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Erasing EPROMs with sunlight

I have heard (I'm not sure how valid it is) that EPROMs could be erased by exposure to UV light. My professor had mentioned it in my Microprocessor Design class; however, I'm not sure if he's bluffing ...
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1answer
2k views

EEPROM in beaglebone black

I want to disable EEPROM in beaglebone black by unloading i2c-omap driver. Will it create problem in hardware or any other software support? What should I expect ?
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Will the PIC18F14K50 perform well as a CNC machine micro-processor?

The data sheet can be found here. I'm trying to select a micro-controller which will eventually run a Wireless 2D Laser Engraver/3D Printer/CNC Machine. I have very little experience in selecting ...
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2answers
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Is the ROM of an MCU NAND FLASH ?

I understand binary code is stored in the ROM area of an MCU. Typically most MCUs have FLASH EEPROMS. Is this really the NAND type FLASH storage we find in most SSDs? If not, what are the ...
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1answer
267 views

Understanding scrolling display circuit

I have this outline of a circuit designed to display a scrolling message. I'm having some trouble understanding how it's supposed to work, so I'm just going to explain what I think I know and go from ...
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1answer
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PIC EEPROM after re-programming

I was trying to get my EEPROM read/write working on my PIC. I first programmed a write cycle, and then reprogrammed it to read it out. (To avoid writing every time I start the program/pic) But I ...
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164 views

EEPROM Microcontroller

It is just a general question. I have designed some micro controller boards with On-Board EEPROM. This EEPROM is to store some configuration parameters for program like calibration data and system IDs....
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2answers
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PIC16F EEPROM write errors

I'm developing on a PIC16F1936 using the MPLAB X IDE with the XC8 complier. I've been given this project where I need to "upgrade" the software of a PCB such that it can interface with an external ...
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2answers
2k views

EEPROM Write Cycle Time and Write Cycle Endurance

I have an embedded software application that is copying a buffer from RAM to EEPROM. In this case, the EPROM device is a 28C010 (128K x 8). The copying is done at non-regular intervals, generally in ...
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3answers
3k views

the . hex file we burn goes to flash memory or RAM or EEPROM of Atmega8?

The flash memory of atmega8 is 8Kb. Is this the maximum size for the .hex file, or it the max memory which i can allocate to variables in my code? If none of the above is true, than what is memory ...
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1answer
963 views

Is 3 bytes a min to address a register in a 256K EEPROM?

I am really new to electronics and embeds and I am struggling with some probably basic notions. (I have a software background.) I have an EEPROM (24LC256) connected to an MBED microcontroller and I ...

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