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Section 12 8-Bit Timer (TMR)
12.5.2
Timing of CMFA and CMFB Setting at Compare-Match
The CMFA and CMFB flags in TCSR are set to 1 by a compare-match signal generated when the
TCNT and TCOR values match. The compare-match signal is generated at the last state in which
the match is true, just when the timer counter is updated. Therefore, when TCNT and TCOR
match, the compare-match signal is not generated until the next TCNT input clock. Figure 12.6
shows the timing of CMF flag setting.
φ
TCNT
TCOR
Compare-match
signal
CMF
Figure 12.6 Timing of CMF Setting at Compare-Match
12.5.3
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 12.7 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 12.7 Timing of Toggled Timer Output by Compare-Match A Signal
Rev. 1.00 May 09, 2008 Page 336 of 954
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