7540 datasheet(83/366 Pages) RENESAS

83 / 366 page

2-7

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

APPLICATION

2.1 I/O port

Fig. 2.1.10 Structure of Interrupt control register 1

Interrupt control register 1

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Name

Interrupt control register 1 (ICON1) [Address : 3E 16]

Serial I/O1 receive

interrupt enable bit

Serial I/O1 transmit interrupt

enable bit

0 : Interrupt disabled

1 : Interrupt enabled

CNTR0 interrupt enable bit

CNTR1 interrupt enable bit

INT0 interrupt enable bit

INT1 interrupt enable bit

Key-on wake up interrupt

enable bit

0 : Interrupt disabled

1 : Interrupt enabled

0 : Interrupt disabled

1 : Interrupt enabled

0 : Interrupt disabled

1 : Interrupt enabled

0 : Interrupt disabled

1 : Interrupt enabled

0 : Interrupt disabled

1 : Interrupt enabled

0 : Interrupt disabled

1 : Interrupt enabled

Timer X interrupt enable bit

0 : Interrupt disabled

1 : Interrupt enabled

2.1.3 Application example of key-on wake up (1)

Outline: The built-in pull-up resistor is used.

Specifications: System is returned from the wait mode when the key-on wakeup interrupt occurs by input

of the falling edge to port P0i.

Note: Only the falling edge is active for the key-on wakeup interrupt.

Figure 2.1.11 shows an example of application circuit, and Figure 2.1.12 shows an example of control

procedure.

Fig. 2.1.11 Example of application circuit

7540 Group

P0i(i:0 to 3)

Key ON

P03

P02

P01

P00

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