Operations of External Interrupt Circuit

CHAPTER 10 EXTERNAL INTERRUPT CIRCUIT 1 (EDGE)

10.6Operations of External Interrupt Circuit 1

The external interrupt circuit 1 can detect a specified edge or edges of a signal input to any of the external interrupt pins.

■Operation of External Interrupt Circuit 1

To operate external interrupt circuit 1, the bits of the registers must be set as shown in Figure 10.6-1 .

Figure 10.6-1 Setting External Interrupt Circuit 1

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
EIC1	EIR1	SL11	SL10	EIE1	EIR0	SL01	SL00	EIE0
EIC2					EIR2	SL21	SL20	EIE2
DDR3
		0	0	0
TCR2							PEN	TSEL
							0
	: Used bit
	: Unused bit
0	: Set "0"

When the polarity of an edge or edges of a signal input from one of the external interrupt pins 1 (INT10 to INT12) matches the selected edge polarity for the pin stored in the appropriate external interrupt control register (EIC1, EIC2:SL00 to SL21), one of the external interrupt request flag bits (EIC1, EIC2:EIR0 to EIR2) corresponding to the pin is set to "1".

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F202RA, MB89202 specifications

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Fujitsu F202RA manual Operations of External Interrupt Circuit, Setting External Interrupt Circuit

Models: F202RA MB89202

CHAPTER 10 EXTERNAL INTERRUPT CIRCUIT 1 (EDGE)

10.6Operations of External Interrupt Circuit 1

Figure 10.6-1 Setting External Interrupt Circuit 1

PEN

F202RA, MB89202 specifications