HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 273

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

Output Compare Flag (OCFA or OCFB) Set Timing: OCFA and OCFB are set to 1 by internal
compare match signals that are output when FRC matches OCRA or OCRB. The compare match
signal is generated in the last state during which the values match (when FRC is updated from the
matching value to a new value). When FRC matches OCRA or OCRB, the compare match signal
is not generated until the next counter clock. Figure 9.29 shows the OCFA and OCFB set timing.
Overflow Flag (OVF) Set Timing: OVF is set to 1 when FRC overflows from H'FFFF to H'0000.
Figure 9.30 shows the timing.
ø
FRC
OCRA, OCRB
Compare match
signal
OCFA, OCFB
ø
FRC
Overflow signal
OVF
Figure 9.29 OCFA and OCFB Set Timing
Figure 9.30 OVF Set Timing
H'FFFF
N
N
H'0000
N + 1
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