Structure Of External Interrupt Circuit 2; Figure 11.2-1 Block Diagram Of External Interrupt Circuit 2 - Fujitsu F2MC-8L Series Hardware Manual

11.2 Structure of External Interrupt Circuit 2

External interrupt circuit 2 consists of the following three blocks:
• Interrupt request generator
• External interrupt 2 control register (EIE2)
• External interrupt 2 flag register (EIF2)
Block Diagram of External Interrupt Circuit 2
P00/INT20 Pin
P01/INT21 Pin
P02/INT22 Pin
P03/INT23 Pin
P04/INT24 Pin
P05/INT25 Pin
P06/INT26 Pin
P07/INT27 Pin
Interrupt request generator
The interrupt request generator generates an interrupt request signal according to the signals
input to the external interrupt pins (INT20 to INT27) and the external interrupt input enable bit.
External interrupt 2 control register (EIE2)
The external interrupt input enable bits (IE20 to IE27) in this register enable or disable the "L"
level inputs from their respective external interrupt pins.
External interrupt 2 flag register (EIF2)
The external interrupt request flag bit (IF20) in this register holds or clears the generated
interrupt request signal.
Interrupt source of external interrupt circuit 2

Figure 11.2-1 Block Diagram of External Interrupt Circuit 2

External interrupt 2 control register (EIE2)
IE27 IE26 IE25 IE24 IE23 IE22 IE21 IE20
11.2 Structure of External Interrupt Circuit 2
External interrupt 2 flag register (EIF2)
– – – – –
Interrupt request generator
8
– – IF20
External
interrupt
request
IRQA
247