Hitachi SH7750 Hardware Manual page 416

Bit 2—Refresh Count Overflow Flag (OVF): Status flag that indicates that the number of
refresh requests indicated by the refresh count register (RFCR) has exceeded the number specified
by the LMTS bit in RTCSR.
Bit 2: OVF
0
1
Note: * If 1 is written, the original value is retained.
Bit 1—Refresh Count Overflow Interrupt Enable (OVIE): Controls generation or suppression
of an interrupt request when the OVF flag is set to 1 in RTCSR.
Bit 1: OVIE
0
1
Bit 0—Refresh Count Overflow Limit Select (LMTS): Specifies the count limit to be compared
with the refresh count indicated by the refresh count register (RFCR). If the RFCR register value
exceeds the value specified by LMTS, the OVF flag is set.
Bit 0: LMTS
0
1
Rev. 6.0, 07/02, page 366 of 986
Description
RFCR has not overflowed the count limit indicated by LMTS
[Clearing condition]
When 0 is written to OVF
RFCR has overflowed the count limit indicated by LMTS
[Setting condition]
When RFCR overflows the count limit set by LMTS*
Description
Interrupt requests initiated by OVF are disabled
Interrupt requests initiated by OVF are enabled
Description
Count limit is 1024
Count limit is 512
(Initial value)
(Initial value)
(Initial value)