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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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Is this EEPROM write procedure on STC microcontrollers correct? Any alternative?

I'm working on a STC15W204S microcontroller, a small, cheap and capable 8051 microcontroller. So far, with the flexibility of SDCC, using the provided STCAI-ISP software and the datasheet (which is ...
fpp's user avatar
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1 answer
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EEPROM M93C66 SPI Based

The M93C66 EEPROM have a 16 bit organization. Does this mean we have to send the instructions 16 bit format or 8 bit format?
Srinivasan V's user avatar
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What is the memory address for 24AA16 EEPROM IC?

I am using 24AA16 EEPROM IC to read and write. But i don't know exactly the memory adddress to write something in this IC and also read from that. This is the datasheet for this IC, https://ww1....
Kuralmozhi's user avatar
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1 answer
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EEPROM READ/WRITE Issue with STM32?

I am using 24AA16 EEPROM to store my data. I have write the code for read and write using STM32Cube IDE. I am using Nucleo-F410RB Dev board. Below code is for write, ...
Kuralmozhi's user avatar
0 votes
1 answer
49 views

RTL2832U EEPROM FW, Unknown USB Device (Device Descriptor Request Failed)

How to flash config into just produced SDR based on the RTL2832U? And what exactly to flash? With empty flash - windows gave an error Unknown USB Device (Device Descriptor Request Failed) The ...
Sergii's user avatar
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4 answers
102 views

Extending EEPROM I2C addressing

So I have a interesting problem that someone could give their input. I'm working on a project where I have 100 "devices" each with its own EEPROM. The "devices" can be connected ...
somerandomusername's user avatar
0 votes
2 answers
169 views

How to write 16 bit hex codes into 93C46 EEPROM with Arduino

I am trying to write data to an EEPROM with some success but not quite. The chip is a 93C46 128 words at 8 bit or 64 words at 16 bit. The data to go in is in 64 word (16 bit) format as follows: When ...
kyotee89's user avatar
0 votes
1 answer
61 views

Writing EEPROM on PIC18F27Q83

I'm trying to write the EEPROM (DFM) on a PIC18F27Q83. I copied the sequence from the datasheet exactly and it still fails. The device id is 0x9909 and revision id is 0xA45. ...
vini_i's user avatar
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16 votes
3 answers
2k views

What is the reasoning behind parallel memory pinouts?

Many of the parallel memory chips I’ve come across have counterintuitive address line pinouts. Take the AT28C256 32KB EEPROM, for example: The data pins are in near-ascending order (only interrupted ...
David D.'s user avatar
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2 answers
162 views

Turn TTL high output signal into ground pulse for EEPROM write

I have a TTL-high output signal which I wish to use to send a negative pulse to a 28c256 EEPROM WE pin to write to it, but the high line may remain high until the next clock signal/output change etc. ...
Hektor's user avatar
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1 answer
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What IC is ATMLH714?

I am diagnosing a PCB that has an 8 pin IC with marking: ATMLH714. I couldn't find any datasheet for the component online. However, I suspect it is an EEPROM possibly by Atmel. Would anyone have any ...
Topa's user avatar
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Losing external EEPROM data after power Cycles on ESP32

Sending "1" starts the write operation into the eeprom every 1 second to the next available address, and sending "2" starts reading the written values into the eeprom. When there's ...
walid Bmd's user avatar
0 votes
3 answers
145 views

Words on 7-Segment Displays [closed]

I'm working on a project that uses three 7-segment displays. My aim is to show the words 'CAT', 'DOG', and 'FOX' using the 3 displays, one word at at time with a 1 second delay in between. To achieve ...
Michael's user avatar
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0 answers
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External NOR Flash malfunctioning

External NOR Flash malfunctioning Part used: ZD25WQ16CTIGT Zetta NOR Flash We are using Zetta family 16MBit NOR Flash in a partitioned format. One partition is used as an emulated EEPROM, and another ...
EmbeddedEngineer's user avatar
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1 answer
98 views

How to write a lookup-table into an 28C64 parallel EEPROM?

Based on the program from this post 28C64 EEPROM Programming Using Arduino, I would like to write, using Arduino Mega, a lookup-table that contains one sinewave cycle, created in Excel. I would like ...
Jerzy Przezdziecki's user avatar
0 votes
1 answer
175 views

What is needed for a 512Kb HDMI EDID EEPROM? (re: 512KB IC2 EEPROM) [closed]

I'm trying to build an HDMI "dummy" plug that simulates a plugged-in monitor (to trick GPUs into thinking a monitor is plugged in). Many of these "dummy" adapters exist and are ...
SofaKng's user avatar
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0 answers
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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 ...
P-Em's user avatar
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1 vote
1 answer
230 views

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 ...
Ankit_Gunner's user avatar
0 votes
1 answer
75 views

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 ...
dontoronto's user avatar
4 votes
1 answer
142 views

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 ...
Eng Sam's user avatar
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1 answer
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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 ...
Jerzy Przezdziecki's user avatar
3 votes
1 answer
154 views

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 ...
fpp's user avatar
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2 votes
0 answers
73 views

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, ...
rdtsc's user avatar
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1 vote
0 answers
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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 ...
An5Drama's user avatar
  • 183
4 votes
2 answers
290 views

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 ...
An5Drama's user avatar
  • 183
1 vote
1 answer
157 views

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 ...
fpp's user avatar
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1 vote
1 answer
1k views

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 ...
Kuralmozhi's user avatar
0 votes
2 answers
270 views

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 ...
John Smith's user avatar
0 votes
0 answers
210 views

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....
Avi Levin's user avatar
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0 answers
95 views

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 ...
GBJ's user avatar
  • 1
1 vote
1 answer
506 views

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 ...
chethanRaj's user avatar
1 vote
0 answers
216 views

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 ...
SSilk's user avatar
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1 vote
0 answers
98 views

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 ...
in.yssh's user avatar
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1 vote
0 answers
337 views

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 ...
jason b's user avatar
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0 votes
1 answer
69 views

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 ...
David777's user avatar
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0 votes
1 answer
75 views

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 ...
zuzomuzabi's user avatar
1 vote
0 answers
157 views

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 ...
Dan Twining's user avatar
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0 answers
86 views

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 ...
Erick.87's user avatar
4 votes
6 answers
694 views

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 ...
Heroz's user avatar
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1 vote
1 answer
587 views

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 ...
zoomlogo's user avatar
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0 votes
0 answers
100 views

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 ...
Lorenzo Marcantonio's user avatar
0 votes
0 answers
325 views

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!...
NixonMroq's user avatar
0 votes
1 answer
113 views

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 ...
mrt's user avatar
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0 votes
1 answer
138 views

How do I use a USB programmer for SOT23-5 EEPROM? [closed]

Like using the ch314 for an unknown SOT23-5 EEPROM.
Isaac Amor's user avatar
8 votes
2 answers
2k views

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 ...
Michael Schmelz's user avatar
1 vote
1 answer
67 views

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....
Benito's user avatar
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-2 votes
1 answer
159 views

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 ...
mohamad abedi's user avatar
1 vote
0 answers
568 views

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 ...
Nikhil Saxena's user avatar
0 votes
0 answers
86 views

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 ...
Mina's user avatar
  • 11
2 votes
2 answers
259 views

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?...
Jerzy Przezdziecki's user avatar

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