In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

Really?  25_000_000?  While I did verify that it will comile, you can't do anything practical at that rate -- you'd be tripping the ISR every other clock cycle and it takes 3 clock cycles just to get into the ISR.

The highest ISR rate I've ever used in a program (SX at 50MHz) was 750_000 -- did this to create a receive UART and 8-channel dimmer for a DMX512 project.  Of course, you can go higher than that, but you're limited to how much you can accomplish within the ISR.  Remember, you have to get in and out and that takes a few cycles on each end.

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