Fujitsu FR60 Hardware Manual page 275

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[Bit 5] UDIE: Overflow/underflow interrupt output control bit

This bit controls whether to enable or disable interrupt output to the CPU when OVFF/UDFF is set

(when overflow or underflow occurs).

Disables overflow/underflow output (initial value).

Enables overflow/underflow output.

[Bit 4] CMPF: Compare detection flag

This flag indicates that the comparison result of the UDCR value and RCR value is that the values are

In write operations, the flag can only be set to "0", not to "1".

If a read modify write instruction is issued, "1" is read from the CMPF bit.

Comparison result does not match (initial value).

Comparison result matches.

[Bit 3] OVFF: Overflow detection flag

This flag indicates the occurrence of an overflow. During write operations, this flag can only be set to

"0", not to "1".

If a read modify write instruction is issued, "1" is read from the OVFF bit.

No overflow (initial value)

[Bit 2] UDFF: Underflow detection flag

This flag indicates that an underflow occurs. During write operations, this flag can only be set to "0",

If a read modify write instruction is issued, "1" is read from the UDFF bit.

No underflow (initial value)

Overflow/underflow interrupt output

Meaning of flag

Mb91350a series