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CHAPTER 11 EXTERNAL INTERRUPT CIRCUIT (EDGE)
11.1 Overview of the External Interrupt Circuit
The external interrupt circuit detects edges on the signals input to the two external
interrupt pins and generates the corresponding interrupt requests to the CPU.
■ Functions of the external interrupt circuit
The function of the external interrupt circuit is to detect specified edges on signals input to the external
interrupt pins and to generate interrupt requests to the CPU. These interrupts can cancel standby mode and
return the device to the normal operating state (RUN state).
External interrupt pins: 2 pins (P42/PWC/INT1 and P46/INT0)
External interrupt sources: Input of a specified edge (rising edge or falling edge) on the signal input to an
external interrupt pin.
Interrupt control: Output of external interrupt requests is enabled or disabled by the interrupt request enable
bits in external interrupt control register (EIC).
Interrupt flags: Detection of specified edges sets the external interrupt request flag bits in external interrupt
control register (EIC).
Interrupt request: Separate interrupt request is generated for each external interrupt source (IRQ0, IRQ1).