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Rev. 1.0, 07/01, page 163 of 372
TCNT value
GRA
H'0000
CST bit
IMFA
Time
Flag cleared
by software
Figure 12-3 Periodic Counter Operation
By setting a general register as an output compare register, compare match A, B, C, or D can
cause the output at the FTIOA, FTIOB, FTIOC, or FTIOD pin to output 0, output 1, or toggle.
Figure 12-4 shows an example of 0 and 1 output when TCNT operates as a free-running counter, 1
output is selected for compare match A, and 0 output is selected for compare match B. When
signal is already at the selected output level, the signal level does not change at compare match.
TCNT value
H'FFFF
H'0000
FTIOA
FTIOB
Time
GRA
GRB
No change No change
No change No change
Figure 12-4 0 and 1 Output Example(TOA = 0, TOB = 1)
Figure 12-5 shows an example of toggle output when TCNT operates as a free-running counter,
and toggle output is selected for both compare match A and B.