External memory and peripherals

[lotfiB]

I want a mode of HCS12 to have the following configuration:

1- Use the internal memory map including registers, eeprom, ram and a part of (no)banked-flash, as in normal single chip.

2- Add an external parallel RAM device, for example 1 Megabyte (20 bits) for aquisition data storage.

3- Add an external parallel peripheral such an ADConverter, 12 bits resolution .

The control of these elements must be done by external bus, not by I/O ports.

The internal flash must visible for loading and execution program .

I read very quicly appliaction note AN2408, is it a good beginning?

Thanks

[Alban]

Hello,

This is not possible with an S12.

The external bus has the S12 as a Master.

Alban.