Bean documentation

	Ext8IO
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Bean Ext8IO

External 8-bit Input/Output
High Level Bean

This bean implements an external byte input/output. It requires additional hardware - an external 8-bit port connected to the processor using address and data busses.

Version specific information for HCS12 derivatives
If external port (memory) is placed in the paged area (0x8000 - 0xBFFF) and a page needs to be switched before a write or a read occurs, -CpPPAGE compiler option must be specified. There are two ways to do it:

-CpPPAGE={PPAGE register address} - Switches the page by writing to the paging register. Faster and denser than the second one.

-CpPPAGE=RUNTIME - Runtime routines placed in non-banked area are used to page switching. Must be used if code and paged port use the same paging register.

For more information see HCS12 compiler manual.