NEC PD78214 - Manual (Page 202)

173
Chapter 7 Timer/Counter Units
7
Fig. 7-77 Example Where Input of No Valid Edge Cannot Be Distinguished from Input of Only One Valid Edge
with External Event Counter
Cannot be distinguished
TM2 1 0 2
CI
0
Count starts
Fig. 7-78 How to Distinguish Input of No Valid Edge from Input of Only One Valid Edge
with External Event Counter
(a) Count start processing
Count starts
Clear INTP2 interrupt
request flag
; Clears PIF2 (0)
Start counting
; Sets CE2 (1)
End
TMC1.7 ←1
IF0L.2 ←0