256
CK
N – 1 N N + 1
Internal clock
TCNT input
clock
TCNT value
Figure 10.17 Count Timing for Internal Clock Sources
CK
N – 1 N N + 1
External clock
input pin
TCNT input
clock
TCNT
Figure 10.18 Count Timing for External Clock Sources (Both-Edge Detection)
Compare-Match Waveform Output Function: For ITU channels 0, 1, 3, and 4, the output from
the corresponding TIOCA and TIOCB pins upon compare matches A and B can be in three
modes: 0-level output, 1-level output, or toggle. Toggle output cannot be selected for channel 2.
• Procedure for selecting the waveform output mode (figure 10.19):
1. Set TIOR to select 0 output, 1 output, or toggle output for compare match output. The
compare match output pin will output 0 until the first compare match occurs.
2. Set a value in GRA or GRB to select the compare match timing.
3. Set the STR bit in TSTR to 1 to start counting.
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