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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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6answers
676 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 ...
-3
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1answer
75 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
866 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 ...
0
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1answer
46 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 ...
1
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2answers
63 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 ...
1
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1answer
49 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 ...
2
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1answer
58 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
42 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 ...
12
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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. ...
2
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2answers
164 views

ATMEL 24C02 EEPROM - Trouble understanding how the addressing works

I am currently writing a library for ATMEL's 24C series EEPROMs (not a programming question). The library works fine with a single EEPROM at the moment and I am trying to support multiple EEPROMs now, ...
1
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1answer
106 views

Help identifying a microprocessor?

I've recently started trying to reverse engineer my old car's ECU (2001 Holden Jackaroo/Isuzu Trooper with a 3.0L diesel 4jx1 engine), purely as a learning experience. I've managed to identify and ...
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5answers
200 views

What to call the cells of memory in a computer or a microcontroller?

I don't know if this is the right forum to post this question, but I thought so because this forum is for educators and I'm a trainer and my question is related to education. I want to do an ...
1
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2answers
64 views

Parallel EEPROM write to with I2C

I was wondering if there is a hybrid between the serial and parallel EEPROM's? What I mean is, is there an EEPROM that can be written to over I2C and then once it is setup can be controlled with some ...
0
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2answers
166 views

STM32f030C8 I2C EEPROM -no data received when read after a write

I am developing library for I2C eeprom at24c04 with stm32f030c8. My read and write functions work but when i try to read immediately after a write to eeprom, the eeprom doest return any data. however ...
0
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3answers
64 views

Problems understanding I2C pullup calculation

I have been trying to read about I2C pullups such that I can select an appropriate pullup resistor for an EEPROM (24LC02B-I/P) which I want to use as serial ROM to drive some 7-segment displays. ...
1
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1answer
52 views

SPI software select not staying low

...and a few other things. I am working my way through Geoffrey Brown's book Discovering the STM32 Microcontroller and it's largely been smooth so far. I've come across an exercise where the reader ...
0
votes
1answer
40 views

Can I write to an I2C EEPROM with an arduino if it is powered by a different circuit?

That is to say, can I just connect the SCL and SDA lines from an externally powered EEPROM to an arduino to write to it? The EEPROM in question is AT24C16A. I am trying to make a circuit which relies ...
0
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1answer
268 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 ...
0
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1answer
89 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 ...
1
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1answer
152 views

How does a memory map of a 1K EEPROM look like? [closed]

I am using a 1Kbit: The device is organized as one block of 128 x 8-bit memory. I want to understand how to it's organized and how addresses are structured? Example: I want to store the world "Hello" ...
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2answers
102 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 ...
0
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1answer
74 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 ...
0
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2answers
113 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 ...
2
votes
2answers
189 views

Ghosting on 7 segment display

I have an EEPROM (AT28C64B) multiplexed and connected to 3 seven segment displays, I did so using a tutorial online from ben eater https://www.youtube.com/watch?v=dLh1n2dErzE&t=300s Sorry for ...
0
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2answers
111 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 ...
0
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0answers
45 views

Ambiguous behavior while using 2 SPI's with relatively similar speeds STM32f030c8

I'm using RFID reader Rc522 communicating with the STM32f030c8 via SPI1 and EEPROM communicating via SPI2. System clock : 48 Mhz (via the Internal PLL system) APB peripheral clock which has the SPI's :...
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2answers
126 views

Can I program a microcontroller by manually programming an EEPROM and then coyping the EEPROM contents to the microcontroller? [closed]

If so , what do I need to learn in order to do that? I know it is possible to manually program an EEPROM. But What I want to know is how I can transfer the date stored in a eeprom to the ...
5
votes
5answers
698 views

Tiny parallel eeprom

Is there such a thing as a low pin-count eeprom IC that can be used to replace logic circuits with just a couple of inputs and outputs? I'm thinking of DIP-16 or smaller, but it needs to be parallel. ...
0
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1answer
56 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 &...
8
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9answers
1k views

EEPROM with high endurance

I am currently working on one embedded project in which I have one counter which will be active all the time. If the power goes down then also I have to store last counter status and load it back in ...
7
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3answers
512 views

Why is there a maximum time for length of write pulse to write on an EEPROM?

I am still just learning about electronics on my own, so please bear with me. The EEPROMs that I have come across (for example this one where the t_wp max is 1000 ns.) all have a time limit for the ...
2
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1answer
98 views

Do eeprom page writes always cost the same time as byte writes?

Some EEPROMs provide the possibility of a multi-byte write. For example, the AT24C provides an 8-byte page write besides the classical single-byte write. The datasheet specifies 5 ms as "Write Cycle ...
0
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2answers
100 views

AT28C16 Interface Help

I pulled an AT28C16 from an old KVM switch and have managed to wire it up like so: A0-10 -> GND CE -> GND WE -> 5V OE -> GND VCC -> 5V GND -> GND I/O0-7 -> Floating. Plugged by hand to level meter ...
0
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1answer
319 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 ...
0
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1answer
56 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 ...
0
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1answer
38 views

EEPROM dublicate pages

I'm facing a strange issue. Whenever I write to my EEPROM (24LC04B), it gets written to every other page as well and I can't understand why. i2cdetect -y 1 returns 8 pages: ...
5
votes
1answer
184 views

What is wrong with my eeprom?

I am using an eeprom M24C32-W from ST. Here is my schematic with VCC=3.3V. The write protection Write Control pin is connected to VSS and thus should be disabled. The address of the device is 0xA0 (or ...
0
votes
1answer
125 views

Increase EEPROM capacity and data lines

Question: I need to increase the capacity and data lines of a EEPROM board using decoder and/or basic logic gates. The EEPROM is Hitachi HN58C1001. it is 128K by 8 bits. Task is to make it 1M by 32 ...
0
votes
1answer
162 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. ...
0
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2answers
101 views

SPI timing of 25LC1024

I'm using an EEPROM chip from microchip, it's doc gives the read/write timing as below: I'm a little confused. From FIGURE 1-2, I think it will read data in at the rising edge of SCK. But from FIGURE ...
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2answers
149 views

nxp microprocessor ethernet socket coding and sending code [closed]

I have nxp lpc43s50 microprocessor and I made an ethernet connection via lan8710 and at24c02 .I know how to connect at24c02 to my microprocessor pins .However I don't know how to send codes to my ...
2
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0answers
186 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 ...
0
votes
0answers
142 views

Help identifying a possible EEPROM in SO8 package labeled “S130 DD08 6171”

I've been looking for a data sheet on this EEPROM in order to read the contents of the ROM. I understand enough to find the power and ground lines, however I have no real idea of how to find the ...
0
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3answers
212 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 ...
0
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2answers
343 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 ...
0
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3answers
265 views

EEPROM Values Corruption - Only Some times

I am using 25LC640A EEPROM with a 32 bit Micro controller. This EEPROM can store 8kb of data, with SPI serial Communication. In my case during every power down sequence MCU will write some block of ...
0
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1answer
53 views

How to select specific programmer from multiple when using flashrom

I have 4 CH341A programmers connected to my laptop. They are all connected to the same USB hub. Reading the content of a SPI EEPROM works fine. How do I select the programmer (of these 4) to be used ...
3
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2answers
833 views

Checking EEPROM for corruption / methods to avoid corruption

When working with EEPROM I'm working on developing methods to expand the life of the EEPROM as long as possible but also checking it for corruption and doing everything I can to avoid corruption upon ...
0
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1answer
132 views

I2C-ATMEGA328p as Master and 24LC256 as slave

So i am trying to establish a connection between ATMEGA328p as Master and 24LC256 EEPROM Chip using I2C protocol. Clock is set to 100KHz SDA and SCK lines are pulled up to Vcc using 4.7K Ohm ...
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2answers
360 views

How to correctly choose a memory?

I'm about a to choose a chip to store a mp3 file (few mo) in it. But I don't really know how to well choose such a memory. Should I go for a flash memory? Eeprom? Nand? Nor? What kind of parameters ...