Fujitsu F2MC-8FX Hardware Manual page 330

CHAPTER 18 EXTERNAL INTERRUPT CIRCUIT
How to enable/disable/clear interrupts
Interrupt request enable flag, Interrupt request flag
Interrupts are enabled by the interrupt enable bit (EIC00. EIE0 or 1).
When disabling interrupt request
When enabling interrupt request
Interrupt requests are cleared by the interrupt request bit (EIC00. EIR0 or 1).
When clearing interrupt request
316
What to be controlled
What to be controlled
Interrupt enable bit (EIE0 or 1)
Set the bit to "0"
Set the bit to "1"
Interrupt request bit (EIR0 or 1)
Write "0"