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When option function select register 1 (OFS1) is modified by an operation other than downloading (e.g. editing through the Memory panel or line assembling), the following steps are necessary to make the new setting take effect.
(1) Modify OFS1.
(2) Start user program execution (write access to OFS1 occurs).
(3) Reset the CPU.
When OFS1 is modified by downloading, the new setting takes effect when the CPU is reset after the downloading.

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The voltage monitoring 1 reset function cannot be used.
If option function select register 1 (OFS1) is modified by downloading to enable the voltage monitoring 1 reset function, the emulator will modify the register value to disable the voltage monitoring 1 reset function.
If option function select register 1 (OFS1) is modified by an operation other than downloading (e.g. editing through the Memory panel or line assembling) to enable the voltage monitoring 1 reset function, an error will occur.

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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.