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Rev. 1.00, 05/04, page 208 of 544
φ
TCNT N
N + 1
TCOR N
Compare-match
signal
CMF
Figure 10.7 Timing of CMF Setting at Compare-Match
10.5.3 Timing of Timer Output at Compare-Match
When a compare-match signal occurs, the timer output changes as specified by the OS3 to OS0
bits in TCSR. Figure 10.8 shows the timing of timer output when the output is set to toggle by a
compare-match A signal.
φ
Compare-match A
signal
Timer output pin
Figure 10.8 Timing of Toggled Timer Output by Compare-Match A Signal
10.5.4 Timing of Counter Clear at Compare-Match
TCNT is cleared when compare-match A or compare-match B occurs, depending on the setting of
the CCLR1 and CCLR0 bits in TCR. Figure 10.9 shows the timing of clearing the counter by a
compare-match.
φ
N H'00
Compare-match
signal
TCNT
Figure 10.9 Timing of Counter Clear by Compare-Match