Renesas 4514 - Manual (Page 120)

APPLICATION
2.2 Interrupts
2-17 4513/4514 Group User’s Manual
(6) Timer 4 interrupt
Constant period interrupts by a setting value to timer 4 can be used.
Outline: The constant period interrupts by the timer 4 underflow signal can be used.
Specifications: Prescaler, timer 3 and timer 4 divide the system clock frequency f(X
IN ) = 4.0 MHz,
and the timer 4 interrupt occurs every 250 ms.
Figure 2.2.8 shows a setting example of the timer 4 constant period interrupt.
Fig. 2.2.1 INT0 interrupt operation example
P3 0 /INT0
P3 0 /INT0
“H”
“H”
“L”
“L”
An interrupt occurs after the valid waveform “falling” is detected.
An interrupt occurs after the valid waveform “rising” is detected.