Datasheet

Rev. 3.00, 03/04, page 295 of 830
11.5.7 Timing of Output Compare Flag (OCF) setting
The output compare flag, OCFA or OCFB, is set to 1 by a compare-match signal generated when
the FRC value matches the OCRA or OCRB value. This compare-match signal is generated at the
last state in which the two values match, just before FRC increments to a new value. When the
FRC and OCRA or OCRB value match, the compare-match signal is not generated until the next
cycle of the clock source. Figure 11.12 shows the timing of setting the OCFA or OCFB flag.
Compare-match
signal
OCFA, OCFB
OCRA, OCRB N
FRC N N + 1
φ
Figure 11.12 Timing of Output Compare Flag (OCFA or OCFB) Setting
11.5.8 Timing of FRC Overflow Flag (OVF) Setting
The FRC overflow flag (OVF) is set to 1 when FRC overflows (changes from H'FFFF to H'0000).
Figure 11.13 shows the timing of setting the OVF flag.
Overflow signal
FRC H'FFFF H'0000
OVF
φ
Figure 11.13 Timing of Overflow Flag (OVF) Setting