Notes On Using External Interrupt Circuit - Fujitsu 8FX Hardware Manual

CHAPTER 12 EXTERNAL INTERRUPT CIRCUIT
12.8 Notes on Using External Interrupt
Circuit
12.8

Notes on Using External Interrupt Circuit

This section provides notes on using the external interrupt circuit.
■ Notes on Using External Interrupt Circuit
• Before setting the edge polarity select bits (SL0[1:0] or SL1[1:0]), set the interrupt request
enable bit (EIE0 or EIE1) to "0" (disabling interrupt requests). In addition, clear the external
interrupt request flag bit (EIR0 or EIR1) to "0" after setting the edge polarity.
• The device cannot wake up from the interrupt service routine if the external interrupt
request flag bit is "1" and the interrupt request enable bit is enabled. In the interrupt service
routine, always clear the external interrupt request flag bit.
186 FUJITSU SEMICONDUCTOR LIMITED
MB95630H Series
MN702-00009-2v0-E