Hitachi H8S/2199 Hardware Manual page 340

Bit 2    Output Comparing Flag B (OCFB): This status flag indicates the fact that the FRC and
the OCRB have come to a comparing match.
This flag should be cleared by use of the software. Such setting should only be made by use of the
hardware. It is not possible to make this setting using a software.
Bit 2
OCFB Description
0 [Clearing conditions]
When 0 is written into the OCFB after reading the OCFB under the setting of OCFB =
1
1 [Setting conditions]
When the FRC and the OCRB have come to the comparing match
Bit 1    Time Over Flow (OVF): This is a status flag indicating the fact that the FRC overflowed.
(H'FFFF → H'0000).
This flag should be cleared by use of the software. Such setting should only be made by use of the
hardware. It is not possible to make this setting using a software.
Bit 1
OVF Description
0 [Clearing conditions]
When 0 is written into the OVF after reading the OVF under the setting of OVF = 1
1 [Setting conditions]
When the FRC value has become H'FFFF → H'0000
Bit 0    Counter Clearing (CCLRA): This bit works to select if or not to clear the FRC by
occurrence of comparing match A (matching signal of the FRC and OCRA).
Bit 0
CCLRA Description
0 Prohibits clearing of the FRC by occurrence of comparing match A
1 Permits clearing of the FRC by occurrence of comparing match A
Rev. 1.0, 02/00, page 327 of 1141
(Initial value)
(Initial value)
(Initial value)