38C3 datasheet(99/224 Pages) RENESAS

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2-34

38C3 Group User’s Manual

APPLICATION

2.3 Serial I/O

Fig. 2.3.3 Structure of Serial I/O control register 2

Fig. 2.3.4 Structure of Interrupt request register 1

Serial I/O control register 2

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O control register 2

(SIOCON2: address 1A16)

Synchronous clock

output pin selection

bit

0: SCLK1

1: SCLK2

Functions

Name

At reset R W

Nothing is arranged for these bits. These are

write disabled bits. When these bits are read

out, the contents are “0”.

Interrupt request register 1

b7 b6 b5 b4 b3 b2 b1 b0

Interrupt request register 1

(IREQ1 : address 3C16)

Name

Functions

At reset R W

INT0 interrupt

request bit

INT1 interrupt

request bit

Serial I/O interrupt

request bit

Timer A interrupt

request bit

Timer 1 interrupt

request bit

Timer 2 interrupt

request bit

INT2 interrupt

request bit

0 : No interrupt request

issued

1 : Interrupt request issued

0 : No interrupt request

issued

1 : Interrupt request issued

0 : No interrupt request

issued

1 : Interrupt request issued

0 : No interrupt request

issued

1 : Interrupt request issued

0 : No interrupt request

issued

1 : Interrupt request issued

0 : No interrupt request

issued

1 : Interrupt request issued

0 : No interrupt request

issued

1 : Interrupt request issued

Timer 3 interrupt

request bit

0 : No interrupt request

issued

1 : Interrupt request issued

V: “0” can be set by software, but “1” cannot be set.

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