UPD17073 NEC, UPD17073 Datasheet - Page 79

• Manufacturer Part Number: UPD17073
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
• Manufacturer: NEC

11.9 External (INT Pin) Interrupts
11.9.1 Outline of external interrupts
signal input to the INT pin.
program.
that lasts for less than 100 ns.
Remark
11.9.2 Edge Detection Block
interrupt request of the INT pin, and detects the specified edge.
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
Whether the interrupt request is to be issued at the rising or falling edge of INT is specified independently through
The INT pin is Schmitt trigger input pin to protect malfunctioning due to noise. This pin do not accept a pulse input
The edge detection block specifies the edge (rising or falling edge) of the input signal that issues the external
The edge is specified by IEG flag.
Figure 11-10 shows the configuration and function of the interrupt edge select register.
INT pin
INT: detects pin status
IEG: selects interrupt edge
Schmitt trigger
INT flag
Figure 11-9. Outline of External Interrupt
detection
IEG flag
block
Edge
Interrupt control block
IRQ flag
PD17072,17073
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