> I've got a question about implementing character displaying on LED
> matrix like 8x5 LEDs, currently in ASM for PIC16F/18F. I'd like drive
> the matrix by PIC that will receive the character number from USART,
> load the character pattern and display it.
> What is the usual way of storing these characters? I can't decide
> whether it's better to use EEPROM or FLASH and if it's better to load
> the characters "on the fly" or buffer them from memory and then display
> them.

Each character is only 5 bytes of data, so you can create an alphabet in 
code space and indirectly address each letter, copying the 5 bytes of data 
for each letter into a buffer. This can be done efficiently using a table 
read in a loop. Your alphabet table would look like this

    retlw 0x7E       ;'A'
    retlw 0x09
    retlw 0x09
    retlw 0x09
    retlw 0x7E

Then you just clock out the data from the buffer into the led matrix 5 bytes 
at a time at a suitable rate for the user to read the characters.

James 

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