Interrupt - Fujitsu 8FX Hardware Manual

CHAPTER 12 EXTERNAL INTERRUPT CIRCUIT

12.5 Interrupt

12.5 Interrupt
The interrupt source for the external interrupt circuit is the detection of the
specified edge of the signal input to an external interrupt pin.
■ Interrupt during Operation of External Interrupt Circuit
When the specified edge of external interrupt input is detected, the corresponding external
interrupt request flag bit (EIC:EIR0 or EIR1) is set to "1". In this case, if the interrupt request
enable bit (EIC:EIE0 or EIE1 = 1) corresponding to that external interrupt request flag bit is
enabled, an interrupt request is generated to the interrupt controller. In an interrupt service
routine, write "0" to the external interrupt request flag bit corresponding to that interrupt
request generated to clear the interrupt request.
180 FUJITSU SEMICONDUCTOR LIMITED
MB95630H Series
MN702-00009-2v0-E