4513_03 Datasheet, PDF (120/210 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.2 Interrupts
(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(XIN) = 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.
“H”
P30/INT0
“L”
“H”
P30/INT0
“L”
An interrupt occurs after the valid waveform “falling” is detected.
An interrupt occurs after the valid waveform “rising” is detected.
Fig. 2.2.1 INT0 interrupt operation example
4513/4514 Group User’s Manual
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