EEPROM Memory - Electronic Circuits Projects Diagrams Free

GatorGuy · 16th June 2005, 07:29 AM

I am looking into EEPROM memory from Microchip and would like to get some input on how they work. Does anyone have any schematics on how to connect them to a PIC? Also do they hold there memory when their power is cut or do they empty it?

**Jay.slovak** · 16th June 2005, 08:56 AM

Quote:

Originally Posted by GatorGuy

I am looking into EEPROM memory from Microchip and would like to get some input on how they work. Does anyone have any schematics on how to connect them to a PIC? Also do they hold there memory when their power is cut or do they empty it?

Why would you like to do that? If your answer is you need more space than Internal EEPROM, that's ok. If not, Internal PIC EEPROMs have a capacity of 256-512 Bytes, that's pretty much. What do you want to store there?
Also, try tu use Internal Program memory to do the job, it's ususally pretty empty and is very fast.
If you still want to use external EEPROM, use one with SPI(25xxx) or I2C(24xxx) serial bus connection.

Ofcourse they Don't "forget" when power is removed.

GatorGuy · 16th June 2005, 11:18 AM

Pretty much to just add more memory. At this point it is only research. I am learning what I can now for future projects. For now internal memory is enough for what I need to do. But I might see a need for it later.

**Jay.slovak** · 16th June 2005, 11:21 AM

Quote:

Originally Posted by GatorGuy

Pretty much to just add more memory. At this point it is only research. I am learning what I can now for future projects. For now internal memory is enough for what I need to do. But I might see a need for it later.

Oh I see, that's alright.

Agent 009 · 16th June 2005, 12:04 PM

I encountered this problem with my recent project, if u remember Jay... I needed much more memory, so I had either to get EEPROM or shorten the program... I chose the latter one, though my teacher stated that it isn't hard to work with EEPROMs: connect'em from PIC ports to pins, looking at teh datasheet (obviously) of the EEPROM...

**Jay.slovak** · 16th June 2005, 12:12 PM

Quote:

Originally Posted by Agent 009

I encountered this problem with my recent project, if u remember Jay... I needed much more memory, so I had either to get EEPROM or shorten the program... I chose the latter one, though my teacher stated that it isn't hard to work with EEPROMs: connect'em from PIC ports to pins, looking at teh datasheet (obviously) of the EEPROM...

Yep I do...

Using external serial memory is not hard, but You should have some experiences before you do so.

Agent 009 · 16th June 2005, 12:20 PM

Trial and error is the key :wink: ...
No really, I think the datasheet and knowing assembly would just do

upand_at_them · 16th June 2005, 02:19 PM

The serial EEPROMs have an I2C interface, which is really easy...just two pins and resistor pullups. I have some JAL code if you want to look at it.

Mike

Agent 009 · 16th June 2005, 02:27 PM

I2C... Is that serial communication?

**Jay.slovak** · 16th June 2005, 03:14 PM

Quote:

Originally Posted by Agent 009

I2C... Is that serial communication?

Yes, it is 2wire, Half-Duplex synchronus serial communication in speeds from 100Khz thru 400Khz to 1Mhz max.

Agent 009 · 16th June 2005, 03:36 PM

But my PIC is driven by a 4MHz oscillator... What 2 do???

williB · 16th June 2005, 03:51 PM

agent009 he said Kilo HZ not MHZ
a 4 mhz PIC should be able to handle 100 KHZ easily..

**Jay.slovak** · 16th June 2005, 05:12 PM

Quote:

Originally Posted by williB

agent009 he said Kilo HZ not MHZ
a 4 mhz PIC should be able to handle 100 KHZ easily..

Or you can use PIC with I2C peripheral, and that very easy and fast.

Agent 009 · 16th June 2005, 05:14 PM

Quote:

Originally Posted by williB

agent009 he said Kilo HZ not MHZ
a 4 mhz PIC should be able to handle 100 KHZ easily..

Yeah, but if he said from 100Khz thru 400Khz to 1Mhz max... 4 MHz in not included???

**Jay.slovak** · 16th June 2005, 05:26 PM

Quote:

Originally Posted by Agent 009

Quote:

Originally Posted by williB

agent009 he said Kilo HZ not MHZ
a 4 mhz PIC should be able to handle 100 KHZ easily..

Yeah, but if he said from 100Khz thru 400Khz to 1Mhz max... 4 MHz in not included???

That's not PIC frequency, it's the BUS speed.

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16th June 2005, 07:29 AM	#1
GatorGuy	EEPROM Memory I am looking into EEPROM memory from Microchip and would like to get some input on how they work. Does anyone have any schematics on how to connect them to a PIC? Also do they hold there memory when their power is cut or do they empty it?

16th June 2005, 11:18 AM	#3
GatorGuy	Pretty much to just add more memory. At this point it is only research. I am learning what I can now for future projects. For now internal memory is enough for what I need to do. But I might see a need for it later.

16th June 2005, 12:04 PM	#5
Agent 009	I encountered this problem with my recent project, if u remember Jay... I needed much more memory, so I had either to get EEPROM or shorten the program... I chose the latter one, though my teacher stated that it isn't hard to work with EEPROMs: connect'em from PIC ports to pins, looking at teh datasheet (obviously) of the EEPROM... __________________ May God be with you. My Blog

16th June 2005, 12:20 PM	#7
Agent 009	Trial and error is the key :wink: ... No really, I think the datasheet and knowing assembly would just do __________________ May God be with you. My Blog

16th June 2005, 02:19 PM	#8
upand_at_them	The serial EEPROMs have an I2C interface, which is really easy...just two pins and resistor pullups. I have some JAL code if you want to look at it. Mike

16th June 2005, 02:27 PM	#9
Agent 009	I2C... Is that serial communication? __________________ May God be with you. My Blog

16th June 2005, 03:36 PM	#11
Agent 009	But my PIC is driven by a 4MHz oscillator... What 2 do??? __________________ May God be with you. My Blog

16th June 2005, 03:51 PM	#12
williB	agent009 he said Kilo HZ not MHZ a 4 mhz PIC should be able to handle 100 KHZ easily..