Solution For External Interrupt Pins Shortage - Renesas M30245 Series User Manual

M30245 Group

3.4 Solution for External Interrupt Pins Shortage

Overview The following are solution for external interrupt pins shortage. Figure 3.4.1 shows the set-up
procedure.
Use the following peripheral function:
• Event counter mode of timer A
Specifications
(1) Inputting a falling edge to the TA0
Operation (1) Set timer A0 to event counter mode, set timer to "0", and set interrupt priority levels in timer A0.
(2) Inputting a falling edge to the TA0
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
page 305 of 354
pin generates a timer A0 interrupt.
IN
pin generates a timer A0 interrupt.
IN
3. Timer A Applications