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CHAPTER 10 EXTERNAL INTERRUPT CIRCUIT 1 (EDGE)
10.1 Overview of External Interrupt Circuit 1
External interrupt circuit 1 detects a predetermined edge or edges of a signal input to
any of three external interrupt pins and then generates and issues an interrupt request
to the CPU.
■ Functions of External Interrupt Circuit 1
The external interrupt circuit 1 functions to detect an optionally selected edge or edges of a signal input to
any of the external interrupt pins and then generate and issue an interrupt request to the CPU. This interrupt
ensures recovery from standby mode and enables transition to a normal operating state (main clock
operation mode).
• External interrupt pins: Three pins (P34/TO/INT10 to P36/INT12)
• External interrupt triggering: Input of a signal with an optionally selected edge or edges (rising and/or
falling edges) to one of the above external interrupt pins triggers an
external interrupt.
• Interrupt control: Interrupt request outputs are enabled or disabled according to the content of an
interrupt request enable bit of external interrupt 1 control registers 1 and 2 (EIC1,
EIC2).
• Interrupt flag:Detection of specified edge or edges is indicated by an external interrupt request flag bit
of external interrupt 1 control registers 1 and 2 (EIC1, EIC2).
• Interrupt request:An interrupt request is generated according to the pin at which the input of the signal
triggering an external interrupt is detected (IRQ0, IRQ1, IRQ2).