Acronym: Electrically Erasable, Programmable Read-Only Memory. Sometimes used with Flash parts that are similar to old EEPROM parts.

learn more… | top users | synonyms

5
votes
5answers
264 views

EEPROM endurance in energy meter?

I am designing an energy meter for electricity billing purposes by converting an analogue energy meter and counting the number of pulses given by the analogue meter's LED. Since power may be cut off ...
1
vote
1answer
110 views

Writing 3 bytes data in EEPROM

In pic18f45k80, the datasheet says one can read and write a byte (8bit) data in EEPROM. I need to write 3 bytes data at once and read it back at once because that 3 bytes data consists of two ...
3
votes
2answers
112 views

Casting integer to character

I am using PIC18f microcontroller. I have to write a 16 bit integer variables (2 bytes) which was cast into two character variable i.e to write each byte in a consecutive adrressess of EEPROM. By ...
0
votes
0answers
78 views

8-Bit data encoding using Hamming code

I am using Pic18f45k80 controller for my project. I am in need of storing 60V lead acid battery's voltage level in internal EEPROM. I am using Hamming code as Error correction algorithm. My data is ...
0
votes
1answer
92 views

PIC microcontroller and different EEPROM sizes?

What is the significance of how big the EEPROM is for a microcontroller. I'm trying to select another PIC (first one I chose - PIC16LF1827 - didn't have enough RAM for the application I needed it for) ...
2
votes
1answer
56 views

27512 pinout and PCB layout

I'm trying to design PCB traces for a 27512 EPROM chip. But its pinout for the higher half of the address bus seems completely illogical to me and I cannot imagine how should I lay out my traces for ...
1
vote
1answer
103 views

Arduino EEPROM store multiple data

I just need a small help to completed my project. As my output is printing 2 result but only 1 output is saving to the eeprom. How can I save multiple data into eeprom? I'm just showing the setup and ...
2
votes
3answers
93 views

Looking for 4 bit memory option

I'm building a small and simple 4-bit CPU and I'm looking for an IC to store the program opcodes. I've considered using eeproms although they seem too large for my purpose, being in the kilobyte ...
2
votes
1answer
89 views

EEPROM Write Limit [duplicate]

Just curious as to why do non volatile memories like EEPROM in an AVR have a write limit ? Also is this limit per location/adress in the memory or on the memory as a whole ?
1
vote
1answer
281 views

Is there any tool to read/write EEPROM of STM32L from the host?

I'm using STM32L152RTC6 (link to similar MCU line) with a built-in EEPROM (8k). I wonder if there's any tool that allows me to read/write the EEPROM from the host side, other than programming the MCU ...
4
votes
1answer
143 views

reading EEPROM at startup only versus reading everytime from EEPROM

I have an AVR code where I store data in EEPROM, this data is actually some settings and USER phone numbers. These are quite often accessed. So I planned to read all the values at start-up to memory ...
0
votes
1answer
149 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 ...
0
votes
1answer
90 views

Programming an EPROM using 8085 kit

I need to program an EPROM/EEPROM with the code for an 8085. I do not have a programmer. I can't buy one. But I have access to an 8085 kit. Can I use it to program the EPROM/EEPROM via an interface? ...
1
vote
2answers
94 views

Play PCM stored in EEPROM without microcontroller

Is it possible to connect digital-to-audio converter with a EEPROM storing PCM data to play that data with a speaker? I am interested in a solution that does not employ any kind of microcontroller. ...
0
votes
0answers
52 views

Is EEPROM read-speed or capacity being held back by the “EEP” qualification?

EEPROMs, the commonplace modern example being NAND Flash memory, seem to be pretty great as a data storage medium. They're pretty fast, pretty capacious, and best of all, when an EEPROM wears out, it ...
2
votes
1answer
187 views

eeprom data corruption during power failure

I recently found a problem with eeprom of a PIC16F877A which is used to control the speed of a dc motor. The drive is supposed to work on the last set speed even if the power fails. But the problem is ...
4
votes
2answers
366 views

What do memory configurations like “256Kx18” mean?

This is a beginner question here. When choosing memory ICs, one of the options is the memory size/configurations. I understand the size part, but what does the "16Kx9" mean? It seems the same memory ...
3
votes
2answers
205 views

Will an SPI EEPROM chip have the same issues with non-atomic write operations as a dsPIC's internal EEPROM? [duplicate]

A while back I had some intermittent trouble with the internal EEPROM of a dsPIC. Every so often, some value in the EEPROM would be found zeroed out on power-on. I tracked the problem down to when the ...
6
votes
4answers
342 views

Will an SPI flash memory chip have the same issues with non-atomic write operations as a dsPIC's internal EEPROM?

A while back I had some intermittent trouble with the internal EEPROM of a dsPIC. Every so often, some value in the EEPROM would be found zeroed out on power-on. I tracked the problem down to when the ...
2
votes
2answers
163 views

usb drive EEPROM IC how is memory read-only blocked and unblocked?

I notice ofteen free give-away usb thumb drive come with a certain memory space locked and unwritable so that a 4 GB flash drive for instance has 1GB of advert which cannot be format. Given that thumb ...
0
votes
1answer
29 views

Floating EEPROM (28c64A) pins an option?

I am building an eeprom programmer for the 28C64A (dip package) with my old basic stamp ii "homework" board (lost my arduino in the move). I have the first four address and data pins, as well as W E ...
1
vote
1answer
56 views

Working principle of floating gate tunneling oxide

Floating gate tunneling oxide (FLOTOX) is used in electrically alterable rom. Tunneling of charge takes place through tunneling oxide into the floating gate. What is the working principle of this? How ...
2
votes
1answer
576 views

How to store array of values in EEPROM of ATmega16 and then read it in sequence

I have this program in which I can store a single value in EEPROM. Can I store an array of values in EEPROM? How? ...
0
votes
2answers
117 views

Decoding ADC pin labels

I'm about to buy a parallel ADC to connect to an EPROM in a analog-digital circuit. I've found some potential ADCs but am having trouble deciding if the ADC and EPROM are compatible. A bistable ...
1
vote
2answers
120 views

Estimating EEPROM read time

This is a question in relation to USB transmissions crash my software GUI. I posted this question separately so that I could clarify my question separate from the other one. I have the same ...
2
votes
1answer
122 views

Dot Matrix IC message board [closed]

I'm trying to make a dot matrix message board -type thing work, The dot matrix IC's are the DL-57 Alpha Numeric Dot Matrix Display [Data Sheet] : ...
2
votes
1answer
441 views

Is there a way to preserve EEPROM contents in AVR Atmega when burning a new firmware to flash with avrdude?

I'm finishing an application which will use some non-volatile parameters stored on an AVR Atmega644P EEPROM. The initial EEPROM values were generated using the EEMEM attribute (like described on this ...
1
vote
2answers
230 views

Algorithm for finding next data in eeprom [closed]

I have an EEPROM and I'm storing data in it, from address 0x00 to 0xff. I have to scan the EEPROM regularly for non zero values. ...
1
vote
1answer
189 views

How to effectively tackle long page write in EEPROM

I'm using C18 compiler and 24LC256 EEPROM. I would like to know how to handle Rollover case in terms of large EEPROM write.I'm writing a Routine that writes 120 Bytes every half an hour and i would ...
0
votes
3answers
72 views

Conditions for page write in EEPROM

I have learned about page write operations from App notes and data sheets of EEPROM chips.But i want to clear certain doubts. I have an EEPROM chip which got 32KB and 64B Page Size. 1.Can i Write ...
4
votes
3answers
165 views

Why are EEPROM sizes measured in “k” or kbit and not kbyte or byte?

I keep seeing EEPROM datasheets using terms such as 4k, 16k, etc. and they're referring to 4 kilobit and 16 kilobit, bits, megabits, and kilobits are often used. Very seldom do they use byte prefixes. ...
0
votes
1answer
126 views

Parallel NOR Flash ROM in-system programming issue (Micron M29F160)

I'm attempting to program a Micron M29F160 Flash ROM (datasheet) that is memory-mapped into a larger system, and I want to program it from the external interface of that system, but I can't seem to ...
1
vote
1answer
85 views

Microchip, memory measured in IEC?

It doesn't say on the data-sheet, but I'm curious where i can find if Microchip uses IEC or SI as standard for there memory sizes. For example: ...
0
votes
2answers
63 views

Memory Problems

I've been having some problems with memory ICs, specifically Flash and EEPROM. I've had some experience with the 7400 series for some time...logic gates are pretty straightforward. Input something, ...
1
vote
1answer
111 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 ...
1
vote
1answer
171 views

I2C delay needed and c18

I am using I2C and I have earlier posted doubts about I2C here. I am using PIC controllers and using their compiler C18. I used their libraries to build a function to write data in EEPROM via I2C, and ...
3
votes
2answers
474 views

CRC for eeprom data check

I wanted to check redundancy in eeprom and crosscheck the data for any errors occurred or not and I ended up reading CRC code. I found it useful but have some doubts that need clarity. My objective ...
2
votes
2answers
134 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 ...
2
votes
2answers
223 views

EEPROM data check

I am communicating with an EEPROM chip with micro controller. I am writing certain data in to specific addresses in EEPROM and needs to check the data occasionally. But I have no idea other than ...
2
votes
1answer
495 views

Writing data on EEPROM or Flash memory of the PIC18F47J53

So I am using the 18F47J53 in Hitech PICC18-PRO compiler with MPLAB-X IDE, and for some reason there happens to be absolutely no support for the reading/writing function to either the flash or the ...
0
votes
1answer
72 views

EEPROM address definitions and delay

I am using 24LC256 EEPROM which have addresses from 0x0000-0x7fff. But I would like to predefine certain address from EEPROM to specific tasks, like from 0-100 for task-1 and so on. Does predefining ...
0
votes
1answer
67 views

25AA320A EEPROM byte write and page write

I need to write data into my external EEPROM 25AA320A using Attiny2313. I know how to write one byte at a time. For example, spieeprom_write (200, 7); with 200 being the starting address on EEPROM, ...
0
votes
1answer
126 views

How to program external EEPROM using USBtinyISP or Pocket AVR programmer

I want to write data into an external EEPROM from my computer using USBtinyISP or Pocket AVR programmer. Is it possible to do that? I know they can be used to program microcontrollers, but not sure if ...
0
votes
0answers
156 views

Noob needs mac OSX based USB PIC programmer to flash eon EN29LV040A PLCC

Please excuse my ignorance of the more technical issues here. I have a Kurzweil synthesizer which has a corrupt flash chip, which I need to reprogram. I would like to know is what PIC programmer is ...
0
votes
0answers
160 views

How do I program a serial EEPROM IC using a raspberry Pi?

I am trying to program the 25L12835F Serial EEPROM with the firmware of the Pineapple WiFi router. I have the u-boot.bin file from Alfa. I have tried a programmer from eBay, but the software is unable ...
3
votes
1answer
89 views

Programming an 82S23

I have to program an 82S23. There is surprisingly little documentation on how to do this. There are datasheets that will tell you how to read it, but not burn. I built one following these ...
0
votes
1answer
228 views

How do I determine what microcontroller is the right one for my project? [closed]

I have just started developing a tiny GPS trackingdevice that (eventually) will be able to log positioning-data on demand - via SMS commands and/or via a smartphone-application. The device should be ...
1
vote
0answers
194 views

PIC : EEPROM not write properly to 0xFF in PIC18F67K22 controller

I am writing values from 0x50 to 0x3ff in EEPROM of pic18f67k22. Whenever eeprom is getting full, I am writing 0xFF and then after write my data from 0x50 location. but some time eeprom is not write ...
1
vote
3answers
844 views

Minimum voltage to avoid EEPROM corruption for ATMega328P

I have a battery powered contraption with an ATMega328P with Arduino code that sleeps most of the time. Occasionally it needs to write some values to EEPROM. It's battery powered so I have tried to ...
0
votes
1answer
47 views

Can I replace an AT28c17 with a CAT28c65B without changing my software?

The AT28c17 is a 16k e2prom while the CAT28c65B is 64K bit e2prom and both are in a 32 pin PLLC package. They have 10 adresss lines with the only difference being the AT28c17 has A0-A10 adress lines ...