M38072MD-XXXFP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M38072MD-XXXFP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

Interrupts

Interrupts occur by twenty sources: eight external, eleven internal,

and one software.

(1) Interrupt Control

Each interrupt except the BRK instruction interrupt have both an

interrupt request bit and an interrupt enable bit, and is controlled by

the interrupt disable flag. An interrupt occurs if the corresponding

interrupt request and enable bits are "1" and the interrupt disable flag

is "0". Interrupt enable bits can be set or cleared by software. Inter-

rupt request bits can be cleared by software, but cannot be set by

software. The BRK instruction interrupt and reset cannot be disabled

with any flag or bit. The I flag disables all interrupts except the BRK

instruction interrupt and reset. If several interrupts requests occurs

at the same time the interrupt with highest priority is accepted first.

(2) Interrupt Operation

Upon acceptance of an interrupt the following operations are auto-

matically performed:

1. The processing being executed is stopped.

2. The contents of the program counter and processor status reg-

ister are automatically pushed onto the stack

3. Concurrently with the push operation, the interrupt jump desti-

nation address is read from the vector table into the program

counter.

4. The interrupt disable flag is set and the corresponding inter-

rupt request bit is cleared.

sNotes on Use

When the active edge of an external interrupt (INT0—INT4, CNTR0

or CNTR1) is set or the timer /INT interrupt source and the ADT/ A-D

conversion interrupt source are changed, the corresponding

interrupt request bit may also be set. Therefore, please take follow-

ing sequence:

(1) Disable the external interrupt which is selected.

(2) Change the active edge in interrupt edge selection register

(in case of CNTR0: Timer X mode register ; in case of CNTR1:

Timer Y mode register).

(3) Clear the set interrupt request bit to "0."

(4) Enable the external interrupt which is selected.

MITSUBISHI MICROCOMPUTERS

3807 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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