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The option function select register 1 (OFS1) cannot be modified by operations (e.g. editing through the Memory panel or line assembling) except downloading.

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The voltage monitoring 0 reset function cannot be used.
If OFS1 register is modified by downloading to enable the voltage monitoring 0 reset function, the emulator will modify the register value to disable the voltage monitoring 0 reset function.

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When CS+ is started up to initiate FINE communication, the emulator forcibly sets bits 25 and 24 in the OFS1 register to 10b. In this case, ensure that the user program does not write to bits 25 and 24.