Configuration - Fujitsu 8FX Hardware Manual

MB95630H Series
12.2

Configuration

The external interrupt circuit consists of the following blocks:
• Edge detection circuit
• External interrupt control register
■ Block Diagram of External Interrupt Circuit
Figure 12.2-1 is the block diagram of the external interrupt circuit.
Figure 12.2-1 Block Diagram of External Interrupt Circuit
Pin
INTn
Pin
INTn+1
External interrupt
control register
(EIC)
Note: Pin names and interrupt request numbers vary among products.
For details, refer to "■ PIN FUNCTIONS" and "■ INTERRUPT SOURCE TABLE"
in the device data sheet.
●
Edge detection circuit
When the polarity of the edge detected on a signal input to an external interrupt circuit pin
(INT) matches the polarity of the edge selected in the interrupt control register (EIC), a
corresponding external interrupt request flag bit (EIR) is set to "1".
●
External interrupt control register (EIC)
This register is used to select an edge, enable or disable interrupt requests, check for interrupt
requests, etc.
MN702-00009-2v0-E
Edge detection circuit 1
10
01
11
EIR1 SL11 SL10 EIE1
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER 12 EXTERNAL INTERRUPT CIRCUIT
Edge detection circuit 0
10
01
11
EIR0 SL01 SL00 EIE0
IRQXX
IRQXX
12.2 Configuration
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