Using built-in 8 bit Address/data bus with Mega2560

Projects General Guidance
1

Hello,

I hope this is the correct place to ask this question. I am using a Mega2560 and would like to use the data/Address buss on Port A and Port C employing the WR and RD pins as well as the ALE pin, like as used with an 8051 u Processor . I can't find much information on this subject. Can anyone point me in the right direction.

Regards,

StanK'

2

Can anyone point me in the right direction.

Page 21 onwards in the 2560 data sheet.

3

Thanks for the info, I'll review it.

I thought maybe someone may have put something together with a Mega using these control lines. I haven't found anything by searching. Maybe I didn't use the correct search criteria.

Stan K'

4

Google the words:-
mega extra memory schematic

I got this as the top hit:-

5

How much memory (RAM?) do you want to use? Have you considered using a controller with that amount of built-in memory?

Access to external memory is slow. If this doesn't matter, memory chips with an I2C interface are easier to connect, to any controller board.

6

DrDiettrich:
How much memory (RAM?) do you want to use? Have you considered using a controller with that amount of built-in memory?

Access to external memory is slow. If this doesn't matter, memory chips with an I2C interface are easier to connect, to any controller board.

Yeah, but you can't use I2C memory chips as part of the normal SRAM address space.