Fujitsu 8FX Hardware Manual page 204

CHAPTER 12 EXTERNAL INTERRUPT CIRCUIT
12.6 Operations and Setting Procedure
Example
■ Setting Procedure Example
Below is an example of procedure for setting the external interrupt circuit.
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Initial settings
1. Set the interrupt level. (ILR*)
2. Select the edge polarity. (EIC:SL0[1:0])
3. Enable interrupt requests. (EIC:EIE0 = 1)
*: For details of the interrupt level setting register (ILR), refer to "CHAPTER 5 INTERRUPTS" in this
hardware manual and "■ INTERRUPT SOURCE TABLE" in the device data sheet.
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Interrupt processing
1. Clear the interrupt request flag. (EIC:EIR0 = 0)
2. Process any interrupt.
Note:
An external interrupt input port shares the same pin with a general-purpose I/O port.
Therefore, when using the pin as an external interrupt input port, set the bit in the port
direction register (DDR) corresponding to that pin to "0" (input).
182 FUJITSU SEMICONDUCTOR LIMITED
MB95630H Series
MN702-00009-2v0-E