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'[PICLIST] PIC: Lookup table with external EEPROM'
2000\11\24@131853 by Drew Vassallo

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I have an application that uses a 16C71 micro with a 24C02 EEPROM.
The EEPROM is preloaded with a table of values, but due to timing
issues, I cannot take the time to read the values from the EEPROM as they
are needed during the program.  I think that instead I have to set up a
lookup table inside the PIC to hold all the EEPROM values for faster access
during program operation.

The EEPROM is replaceable to allow different tables to be loaded, so
I guess I need to find out how to create an empty table in the PIC that
allows me to load all the EEPROM values at startup, then access them via
computed goto (retlw).  I swear I saw some code for this in my travels on
the 'net, but I can't seem to locate it now that I actually need it.

Any ideas?

--Andrew

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2000\11\24@133932 by mike

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On Fri, 24 Nov 2000 13:18:53 -0500, you wrote:

>I have an application that uses a 16C71 micro with a 24C02 EEPROM.
>The EEPROM is preloaded with a table of values, but due to timing
>issues, I cannot take the time to read the values from the EEPROM as they
>are needed during the program.  I think that instead I have to set up a
>lookup table inside the PIC to hold all the EEPROM values for faster access
>during program operation.
>
>The EEPROM is replaceable to allow different tables to be loaded, so
>I guess I need to find out how to create an empty table in the PIC that
>allows me to load all the EEPROM values at startup, then access them via
>computed goto (retlw).  I swear I saw some code for this in my travels on
>the 'net, but I can't seem to locate it now that I actually need it.
>
>Any ideas?
a) A microwire eeprom (93- or 25- series) will be a lot faster if you
have another pin.
b) Use a 16C711 - lots more RAM so you may be able to load all the
eeprom data to RAM at startup for quick access later

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2000\11\26@174811 by Steve Smith

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The EEPROM is replaceable to allow different tables to be loaded, so
I guess I need to find out how to create an empty table in the PIC that
allows me to load all the EEPROM values at startup, then access them via
computed goto (retlw).  I swear I saw some code for this in my travels on
the 'net, but I can't seem to locate it now that I actually need it.

Any ideas?

You cant write to ROM from an external read (i2c) copy the values to a ram
block and use the FSR (INDF) to read back .
work off a base address and load the values into a chunk this can fast access
as ram later . (this depends on how much ram you have free) maybe a bigger
pic (873) it has its on eerom on board..

Steve.....

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