M30620FCAFP datasheet(481/615 Pages) RENESAS

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Key-Input Interrupt

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-164

Figure 2.13.4. Example of operation of key-input interrupt

P100 output

P101 output

P102 output

P103 output

P104 to P107

input

Key input

Key OFF

Key ON

Key input

interrupt processing

Key matrix scan

(1) Enter to stop mode

(2) Cancel stop mode

(3) Key scan

(4) Enter to stop mode

Key ON

2.13.2 Operation of Key-Input Interrupt

The following is an operation of key-input interrupt. Figure 2.13.3 shows an example of a circuit that uses

the key-input interrupt, Figure 2.13.4 shows an example of operation of key-input interrupt, and Figure

2.13.5 shows the setting procedure of key-input interrupt.

(1) Set the direction register of the ports to be changed to key-input interrupt pins to input, and set

the pull-up function.

(2) Setting the key-input interrupt control register and setting the interrupt enable flag makes the

interrupt-enabled state ready.

_____

(3) If a falling edge is input to either KI0 through KI3, the key-input interrupt request bit goes to “1”.

Operation

Figure 2.13.3. Example of circuit using the key-input interrupt

P100

VREF

I/O port

P101

P102

P103

P104 / KI0

P105 / KI1

P106 / KI2

P107 / KI3

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