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UPD17072 Datasheet(PDF) 81 Page - Renesas Technology Corp

Part # UPD17072
Description  MOS INTEGRATED CIRCUIT
PDF  228 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17072 Datasheet(HTML) 81 Page - Renesas Technology Corp

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µPD17072,17073
79
11.9 External (INT Pin) Interrupts
11.9.1 Outline of external interrupts
Figure 11-9 outlines the external interrupts.
As shown in this figure, an interrupt request for an external interrupt is issued at the rising or falling edge of the
signal input to the INT pin.
Whether the interrupt request is to be issued at the rising or falling edge of INT is specified independently through
program.
The INT pin is Schmitt trigger input pin to protect malfunctioning due to noise. This pin do not accept a pulse input
that lasts for less than 100 ns.
Figure 11-9. Outline of External Interrupt
Remark
INT: detects pin status
IEG: selects interrupt edge
11.9.2 Edge Detection Block
The edge detection block specifies the edge (rising or falling edge) of the input signal that issues the external
interrupt request of the INT pin, and detects the specified edge.
The edge is specified by IEG flag.
Figure 11-10 shows the configuration and function of the interrupt edge select register.
INT pin
INT flag
Schmitt trigger
IEG flag
Edge
detection
block
IRQ flag
Interrupt control block



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