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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Problem in code while interfacing PIC24 with 25AA256 EEPROM
I have been trying to interface a PIC24FJ128GA010 with a 25AA256 EEPROM using Proteus and Serial Peripheral Interface (SPI).
I wrote a C code and configured everything and all pins but since I self ...
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What is 0-255 in EEPROM in Arduino?
I am trying to use the EEPROM in Arduino but somehow getting the wrong number. Can anyone explain to me what does that parameter 'value' of 0 to 255(byte) actually mean does it mean it can only hold a ...
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What is a color bars vector diagram?
I'm reading the datasheet of the "AT7456E". This component is an OSD (so-called "on screen display") used on the flight controller of my drone project.
In the datasheet there was ...
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Non-standard bitrate for I2C EEPROM
I have an I2C bus containing only 2 devices: a microcontroller and a Microchip 24LCXXX EEPROM.
In the datasheet of the EEPROM only maximum speed is specified (which is 100 kHz @VDD<2.5 V and 400 ...
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Can I write and read a parallel EEPROM content with Analog Discovery 2?
I am wondering if I can read or write the contents of a parallel EEPROM (e.g., 28C64) using Analog Discovery 2. Is C/C++ necessary for this purpose, or is Java sufficient (since AD2 allows scripting ...
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How can I dynamically preload the EEPROM on a PIC microcontroller
I'm trying to set up code to preload the EEPROM of a PIC16F628A with the necessary data depending on the value of one #define, so the uC is ready to be popped into ...
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Is it safe to replace a 120ns Flash memory with a 90ns part?
Here is an old PLC board with a pair of AM29F200AB-120SI SOP-44 256kB 5V flash chips. One is unable to retain data, after nearly three decades in service.
These are very challenging to find today, ...
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Does "field electron emission" used in EEPROM work better than "hot-carrier injection" in NOR Flash?
After deeping research based on my another question, I continued comparing Flash and EEPROM based on wikipedia comparison table.
From wikipedia about the Flash memory:
Programming
the source-drain ...
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Differences between EPROM and EEPROM
I found one valuable Utmel blog which explains the three things:
The internal chip can be erased by irradiating ultraviolet rays through the hole. The EPROM eraser is needed to complete the chip ...
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Internal EEPROM on PIC16F628A
I'm currently writing code for an alarm system, and I'm having some issues with the EEPROM at the moment of writing/reading (with MPLAB) its contents. I'm not trying to write any variables or ...
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Does ESP32 Wroom-32 have internal EEPROM?
I'm working with ESP32 Wroom-32 and AHT25 temperature and humidity sensors. I need to store the temperature and humidity data using EEPROM.
I don't think ESP32 has internal EEPROM. If not means how ...
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Is it possible to simulate an EEPROM with the STM32 F446RE chip?
I looked through the STM32 F446RE datasheet and was unable to find a way for the chip to keep persistent data values for when it is turned on and off, or when reset.
The only alternative I can think ...
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Converting an application from ESP32 board to STM32 board
I wrote an app for my ESP32 but then I learned that ESP32 doesn't work well on batteries, since they got drained pretty quickly.
So I bought a STM-32 board (NUCLEO-32, STM32L432KC MCU): https://www....
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Issues reading data back from 24LC512 EEPROM via interrupt on MSP430F47187
I have interfaced MSP430F47187 with 24LC512 EEPROM. I am able to write to the EEPROM without any issue but reading the data from the EEPROM is problematic as the reading stops after a while.
I have ...
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SPI EEPROM refuses to communicate, returns FF or 0 every time
I've been trying to learn SPI, using an EEPROM 25L4005. I've tinkered with it all day, read the datasheet multiple times, but still the output from the EEPROM is FF. The data is sent to the slave ...
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Calculate Xilinx MCS PROM checksum (signature)
Is it possibly to calculate the checksum (or signature in Xilinx terminology) for a Xilinx MCS file myself, i.e. without using promgen.exe or any other Xilinx tools?
This question has been asked many ...
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Not being able to write&read data from the 24C04N EEPROM using I2C
I have connected the 24C04N EEPROM to the ATmega328p like this -
Image source - Google
The only difference is I connected the ATmega328p on a breadboard using FTDI like this -
Image source - This is ...
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USB to Ethernet controller, RTL8153, without EEPROM and only 3.3 V
I want to implement an RTL8153 controller in the simplest and most compact way possible on the PCB of an Arduino project. It's a driver-free (CDC-ECM) USB to Ethernet PHY controller.
Can it be used ...
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Is AM29F040B CMOS EEPROM TTL Compatible
I can't really make any sense of the datasheet regarding whether the AM29F040B EEPROM can be used with TTL inputs, so wanted to ask on here.
It is a 5V CMOS IC, but there are mentions in the datasheet ...
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Way around battery controller limiting maximum charge of new cells
I rebuilt a camera battery (NP-F550) and need clarification as to what is going wrong.
The battery charges and powers the camera without issue, but will only charge for ~5 minutes before charging ...
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PIC18 I2C EEPROM interface SEN stuck high
I'm trying to get a PIC18F46K40 I2C interface to work with a M24M01-D EEPROM, however I'm having problems where my code is checking for the I2C bus to be idle before initating a start condition using ...
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EEPROM endurance from a hardware view
When data is written to the EEPROM that is identical to what is already stored, does it have any different effect on endurance than when there bits are toggles?
Is there an effect, like in flash ...
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How to identify Winbond W25Q64.V spi-flash chip replacement
I am trying to flash coreboot on to a Thinkpad T440p.
It has two BIOS chips - "upper" 4MB and "bottom" 8MB. I use a Raspberry Pi 2 B+ and the skulls project to program in-situ (...
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What address does it save in EEPROM?
I watched Ben eater's video about a building computer based on 6502 microprocessor and I'm stuck at Part-3 ( Assembly language VS Machine code). He was programing a 32k AT28C256 EEPROM and he ...
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How would I use a serial EEPROM as a parallel EEPROM in a breadboard computer build?
I have been thinking of building Ben Eater's 8 bit computer (on a budget) for some time now but the only EEPROMs I can find are serial EEPROMs with I2C interface. I am wondering if I can use a serial ...
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EEPROM corruption with heavy VCC interferences
I have an EEPROM memory (24LC01B on a board used with severe electrical noise.
Severe as in the external watchdog needs to reset everything (it's doing its job, correctly). Everything restarts ...
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Help with identifying rip off ARC HP Chip
I am really tired of 30$ HP Aliexpress magic chips worth 0.5$ in BOM.
Usually I did not care that much about the price as those ARC chips are more less permanent. However this time curiosity took over!...
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How to use external EEPROM (25AA320A) with the AT89S52 microcontroller over SPI
I am using the AT89S52-24PU as my MCU for a project where I need to read data from an EEPROM chip (in this case the 25AA320A serial EEPROM chip) over SPI. On the datasheet for the AT89S52 it says that ...
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How do I use a USB programmer for SOT23-5 EEPROM? [closed]
Like using the ch314 for an unknown SOT23-5 EEPROM.
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2K EEPROM has only 1K?
Using Microchip EREPROM 24AA02E48.
Datasheet says it is a "2-Kbit I2C Serial EEPROMs".
In my eyes, 2KBits/8 = 256 Bytes.
Storage is addressed in what they call "words",
addressable ...
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PIC1618044 Error while reading EEPROM 24LC64F
I am currently trying to program the I2C to communicate with an EEPROM 24LC64F, with its pin A0, A1 and A2 to GND, 4.7k ohms on SDA and SCL pins, 5V on VCC.
I currently have these lines of code :
I2C....
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Using STM32F103C6 SPI just for reading an EEPROM 25AA010A data [closed]
No matter what is written before, is that possible?
Without knowing what data is written inside of an EEPROM 25AA010A, I want to read it using STM32F103C6 SPI. I write and read before on it, but now I ...
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Repair HDMI HPD and EDID failure
This is a photo of an old video board from a Dell display showing "No Cable", and "No Signal" OSD messages but working correctly when video is force-enabled and EDID is supplied ...
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NUCLEO-GO71RB with one-wire AT21CS11 EEPROM
I am trying to interface an AT21CS11 EEPROM with a SMT32 micro on a Nucleo board. I have adapted the code of the certified demo https://github.com/MicrochipTech/SWI-Connector-Demo.git to the SMT32 to ...
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How to generate waveform values for storing in an EEPROM?
I need to program an old EEPROM with 16 different waveforms: triangle, rectangle, sine, etc.
Is there a method that can encode a given waveform into an array of values like you can do in a spreadsheet?...
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How to make a TTL low pulse of 100 ns to 1 μs with a simple RC on a 74LS04 inverter?
I APOLOGIZE THAT THIS IS GETTING LONG-ish. There are many updates at the end, and I begin editing the original to bring some finding and WARNINGs into it.
BACKGROUND
I am building myself a Z80 ...
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EEPROM usage in LAN9500 USB to Ethernet IC
I'm using a Microchip LAN 9500 USB 2.0 to Ethernet IC - Datasheet
However, I don't want to use the EEPROM section, and I don't want the IC to be connected to any EEPROM.
What do I have to do with the ...
user220456
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Could I have a whole batch of bad AT26C16 EEPROM chips?
I am in TTL chip heaven (India) where I can get these things for pennies on the dollar, so I bought batches of chips to tinker with. Among them a 16 AT28C16 EEPROMs, looking like new, and then 2 very ...
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I2C address of a 5-pin 24C02S EEPROM?
According to everywhere I've looked, the 24C02S uses 3 address pins, statically hard wired to set the address of the chip. What if the 24C02S is in a Sot23-5 package? VCC, GND, WP, SCL, SDA are all I ...
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Can exceeding the write endurance of one EEPROM address corrupt the data at adjacent addresses?
As the title says, I want to know what could happen if you write too many time in one EEPROM address.
To be specific, I'm working on a microcontroller (STM32L072) and I saw a bit flip in EEPROM at a ...
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EEPROM size & Managed Mode vs Unmanaged Mode Ethernet Switch
I want to understand 2 points in Ethernet Switch ICs.
In this IC - LAN9353, on page 34, the description in the table is mentioned.
"A low selects 1K bits (128 x 8) through 16K bits (2K x 8).
A ...
user220456
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Strange behaviour AT28C64B
I recently got a bunch of AT2864B EEPROMs that I am using to make multiplexer for a display.
I've hooked up all values correctly and looked through my code countless times without any trace of such ...
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MC24C08 EEPROM Write Cycles
What is the MC24C08 maximum write cycle count for a given bit or for a given byte? It doesn't say so on the datasheet, and I get conflicting answers when I look up this question for other EEPROMs (...
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FT232R custom eeprom - D2XX
trying to figure out how to read full EEPROM dump and flash it back without using any templates, M Prog and FT Prog.
Need a way to utilize extra space on eeprom for authenticating cables.
Basically ...
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Non volatile memory on simple hardware board [duplicate]
I'm designing a low frequency board with some analog signals inputs and a few discrete logic gates which drive warning LEDs. I want to save the status of the LED even if the board is powered off. No ...
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FLASH memory corruption
I have a stm32f030c8t6 which I wish to save some data in its FLASH memory. I use Address Page30 which is 0x08007800 in memory map. it is in 7th Sector. I've developed my code and easily saved some ...
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How to know if an EEPROM IC can interface via Octospi?
I just learned that Octospi can NOT be configured to be used as a standard SPI device as Octospi was designed to be used to interface with external memory devices.
The thing is, EEPROM ICs don't seem ...
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Can I improve EEPROM lifetime by not changing individual bits?
In my current project I need to store (among other things) the current elapsed time in hours to retrieve it in case of power loss. Since I am using a Arduino Nano I would ideally like to use the built ...
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EEPROM usage in ZS-042
I have bought a realtime clock module (this one). According to the sparse data I found there is a EEPROM on it. It's called 24C32 as can be seen on this schematic I found:
As I want to rebuild this ...
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EEPROM with GPIO [closed]
Trying for a while now, but I cannot find an EEPROM memory with some address bit mapped to a GPIO. Or from a different angle, a GPIO expander with an EEPROM memory to save the config.
Do such devices ...
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