7733 datasheet(105/940 Pages) RENESAS

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KEY INPUT INTERRUPT FUNCTION

7733 Group User’s Manual

5–2

KI2

KI1

KI0

P64/INT2

P63

P62

P61

P60

Key matrix

M37733MHBXXXFP

KI3

The key input interrupt function is used to generate an interrupt request when one of the input levels of four

or five pins falls. By using this function when terminating the stop or wait mode, the key-on wakeup can be

realized.

For the way to terminate the stop or wait mode, refer to section “17.4 Power saving.”

For the stop and wait modes, refer to chapter “11. STOP AND WAIT MODES.”

5.1 Overview

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A key input interrupt request occurs when one of the input levels of pins KI0 to KI3 falls. Therefore, by

configuring an external key matrix shown in Figure 5.1.1, an interrupt request can be generated only by

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pushing a key. Pins KI0 to KI3 can be pulled high by software and the same function can also be selected

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for port P64. Therefore, when using the key input interrupt function, whether to use four pins (pins KI0 to KI3)

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or five pins (pins KI0 to KI3 and P64) can be selected.

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The key input interrupt and the INT2 interrupt share the same interrupt vector addresses and interrupt control

5.1 Overview

Fig. 5.1.1 Key matrix example when key input interrupt function is used

7733 Datasheet(PDF) 105 Page - Renesas Technology Corp