PD17012_15 Datasheet, PDF (113/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
11.9 External (INT Pin) Interrupt
11.9.1 Outline of external interrupt
Figure 11-10 illustrates the external interrupt.
As shown in the figure, the external interrupt issues an interrupt request at the rising edge of the signal input
to the INT pin.
The INT pin is a Schmitt-trigger input pin to prevent malfunctioning due to noise, and does not accept a pulse
less than 1 µs wide.
Figure 11-10. Outline of External Interrupt
INT flag
IEG flag
Interrupt control block
INT pin
Schmitt trigger
Edge
detection
block
IRQ flag
Remark INT: Detects pin status
IEG: Selects interrupt edge
11.9.2 Edge detection block
The edge detection block sets and detects the input signal edge (rising or falling edge) and that issues the
interrupt request of the INT pin.
The edge setting is made by the IEG flag.
Figure 11-11 shows the configuration and function of the interrupt edge select register.
Data Sheet U10101EJ4V0DS
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