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Msc1210EVM Board - External Memory Question

① Development Environment 

Compiler : IAR Embedded Workbench for MCS-51 

Development  Board : MSC1210EVM

② Question

Attached to MSC1210EVM will try to use External Memory.

However, External Memory to control the HCR0, HCR1, CADDR, CDATA Register know that you need to control.

But HCR0, HCR1 Register Fusebit set the control, is not it?

Is it possible to control or program?

Using External Memory with MSC1210EVM Board recommend the kernel patch if you will please leave posts.

Sample Source, or if you please attach.

Datasheet and the schematic attached.