Fujitsu FR60 Hardware Manual page 291

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This bit is the interrupt enable bit for a U-TIMER underflow.

[Bit 3] UNDR (UNDeR flow flag)

This bit is a flag indicating that an underflow has occurred. The UNDR bit is cleared at reset and when

"0" is written to it. For a read by a read modify write instruction, "1" is always read.

Writing "1" to the UNDR has no effect.

[Bit 2] CLKS (CLOCK Select)

In the MB91350A, always write "0" to this bit.

[Bit 1] UTST (U-TIMER STart)

This bit is the U-TIMER operation enable bit.

Interrupt disabled (initial value)

Interrupt enabled

Stopped. Writing "0" during operation stops running of the U-TIMER. (initial value)

Operation. Writing "1" during operation does not stop the U-TIMER.

Mb91350a series