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Rev. 1.00, 05/04, page 175 of 544
9.5.8 Timing of FRC Overflow Flag Setting
The FRC overflow flag (OVF) is set to 1 when FRC overflows (changes from H'FFFF to H'0000).
Figure 9.13 shows the timing of setting the OVF flag.
Overflow signal
FRC H'FFFF H'0000
OVF
φ
Figure 9.13 Timing of Overflow Flag (OVF) Setting
9.5.9 Automatic Addition Timing
When the OCRAMS bit in TOCR is set to 1, the contents of OCRAR and OCRAF are
automatically added to OCRA alternately, and when an OCRA compare-match occurs a write to
OCRA is performed. Figure 9.14 shows the OCRA write timing.
Compare-match
signal
OCRAR, OCRAF
A
OCRA N
N + A
FRC N N +1
φ
Figure 9.14 OCRA Automatic Addition Timing