M38C89MF datasheet(19/55 Pages) RENESAS

19 / 55 page

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C8 Group

Fig. 13 Interrupt control

Fig. 14 Structure of interrupt-related registers

Interrupt request bit

Interrupt enable bit

Interrupt disable flag (I)

BRK instruction

Reset

Interrupt request

Interrupt request register 1

INT0 interrupt request bit

INT1 interrupt request bit

Serial I/O receive interrupt request bit

Serial I/O transmit interrupt request bit

Timer X interrupt request bit

Timer Y interrupt request bit

Timer 2 interrupt request bit

Timer 3 interrupt request bit

0 : No interrupt request issued

1 : Interrupt request issued

(IREQ1 : address 003C16)

Interrupt request register 2

CNTR0 interrupt request bit

CNTR1 interrupt request bit

Timer 1 interrupt request bit

Not used (returns “0” when read)

Key input interrupt request bit

A-D conversion interrupt request bit

Not used (returns “0” when read)

(IREQ2 : address 003D16)

Interrupt edge selection register

INT0 interrupt edge selection bit

INT1 interrupt edge selection bit

Not used (return “0” when read)

(INTEDGE : address 003A16)

0 : Falling edge active

1 : Rising edge active

Interrupt control register 1

INT0 interrupt enable bit

INT1 interrupt enable bit

Serial I/O receive interrupt enable bit

Serial I/O transmit interrupt enable bit

Timer X interrupt enable bit

Timer Y interrupt enable bit

Timer 2 interrupt enable bit

Timer 3 interrupt enable bit

(ICON1 : address 003E16)

Interrupt control register 2

CNTR0 interrupt enable bit

CNTR1 interrupt enable bit

Timer 1 interrupt enable bit

Not used (returns “0” when read)

(Do not write “1” to this bit)

Key input interrupt enable bit

A-D conversion interrupt enable bit

Not used (returns “0” when read)

(Do not write “1” to this bit)

0 : Interrupts disabled

1 : Interrupts enabled

(ICON2 : address 003F16)

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