7630 datasheet(82/238 Pages) RENESAS

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APPLICATION

2.2 Interrupts

2-16

7630 Group User’s Manual

2.2.4 Key-on wake-up interrupt

Figure 2.2.12 and Figure 2.2.13 show setting method for registers related to the key-on wake-up interrupt.

Port P4 direction register (P4D) [Address: 001116]

Port P40 direction register

Port P41 direction register

Port P42 direction register

Port P43 direction register

Port P44 direction register

Port P45 direction register

Port P46 direction register

Port P47 direction register

Interrupt control register C (ICONC) [Address: 000716]

Key-on wake-up interrupt enable bit

Step 1: Disable the key-on wake-up interrupt or all interrupts to prevent unnecessary interrupts occurring during setting.

In the former, set the Interrupt disable flag (I) to “1”.

In the latter, clear the Key-on wake-up interrupt enable bit to “0”.

Step 2: Set the ports of P4 used as key-on wake-up input pin to input mode.

Step 3: Pull-up/down the ports of P4 used as key-on wake-up input pin.

0 : Input mode

1 : Output mode

Port P4 pull-up/down control register (PUP4) [Address: 002C16]

Port P40 pull-up/down transistor control bit

Port P41 pull-up/down transistor control bit

Port P42 pull-up/down transistor control bit

Port P43 pull-up/down transistor control bit

Port P44 pull-up/down transistor control bit

Port P45 pull-up/down transistor control bit

Port P46 pull-up/down transistor control bit

Port P47 pull-up/down transistor control bit

0 : No pull-up/down

1 : Pull-up/down

Step 4: Set the key-on wake-up polarity.

Polarity control register (PCON) [Address: 002F16]

Key on wake-up polarity control bit

0 : Low level active (P4 pull-up)

1 : High level active (P4 pull-down)

Fig. 2.2.12 Setting method for registers related to key-on wake-up interrupt (1)

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