Hitachi H8/3664 Hardware Manual page 230

Figure 12.22 shows an example of input capture when both edges of FTIOA and the falling edge
of FTIOB are selected as capture edges. TCNT operates as a free-running counter.
TCNT value
H'FFFF
H'F000
H'AA55
H'55AA
H'1000
H'0000
FTIOA
GRA
FTIOB
GRB
214
H'1000
H'AA55
Figure 12.12 Input Capture (Example)
H'F000
Time
H'55AA