Rev. 1.0, 02/00, page 338 of 1141
16.3.7
Output Comparing Flag (OCFA and OCFB) Setting Up Timing
The OCFA and OCFB are being set to 1 by the comparing match signal being output when the
values of the OCRA, OCRB and FRC match. The comparing match signal is generated at the last
state of the value match (the timing of the FRC's updating the matching count reading).
After the values of the OCRA, OCRB and FRC match, up until the count up clock signal is
generated, the comparing match signal will not be issued. Figure 16.10 shows the OCFA and
OCFB setting timing chart.
Comparing match
signal
OCFA, OCFB
OCRA, OCRB
FRC
N
N
N+1
φ
Figure 16.10 OCF Setting Up Timing
16.3.8
Overflow Flag (CVF) Setting Up Timing
The OVF is set to when the FRC overflows (H'FFFF
→
H'0000). Figure 16.11 shows the timing
chart.
Overflowing
signal
FRC
H'FFFF
H'0000
OVF
φ
Figure 16.11 OVF Setting Up Timing