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What are the ""Ex"" pins shown in the pin assignment?

Latest Updated:04/07/2011

Question:

What are the "Ex" pins shown in the pin assignment?
For example, ExIRQ0, ExTMI0...

Answer:

Pin function with "Ex" is the same as pin function without "Ex".
Either can be used as a pin of for the selected function.
If there are both an IRQ0 pin and an ExIRQ0 pin, either one could be used for IRQ0 function. For example, when the IRQ0 pin is being used by another function, the IRQ0 function can still be used by selecting the ExIRQ0 pin.
Pin selection can be set using the IRQ sense port select register (ISRR), port control register (PTCNT) or port function control register (PFCR).
Please refer to the "I/O port" section in the hardware manual.

 

Suitable Products
H8S/2472, 2463, 2462
H8S/2100