External Interrupt Registers - Fujitsu MB96300 series Hardware Manual

CHAPTER 17 EXTERNAL INTERRUPTS
17.2

External Interrupt Registers

The External Interrupt mdule has the following registers:
• Interrupt Enable register (ENIRn: External Interrupt Request Enable Register)
• Interrupt flag (EIRRn: External Interrupt Request Register)
• Request level setting register (ELVRn: External Level Register)
■ Interrupt Enable Register (ENIRn: External Interrupt Request Enable Register)
Figure 17.2-1 External Interrupt Request Enable Register (ENIRn)
ENIR0
ENIR1
R/W : Readable and writable
The ENIRn register contains the interrupt enable bits of the external interrupt module. When an ENx bit is
enabled, an interrupt request is signaled if the specified interrupt event is detected at the corresponding pin.
Writing "1" to these bits enables and writing "0" disables interrupt requests.
Note:
When an interrupt should be enabled, please also set the corresponding port's Port Input Enable Register PIER
(please refer to section 13.2.4 "Port Input Enable Register (PIERnn)").
■ Interrupt flags (EIRRn: External Interrupt Request Register)
EIRR0
EIRR1
R/W : Readable and writable
The EIRRn register contains the interrupt flags.
If the specified interrupt event is detected at a pin, the corresponding ERx bit is set and if the ENx bit is "1",
then an interrupt request is signaled to the interrupt controller. Writing "1" to these bits has no effect and
writing "0" clears the flags. "1" is always read from these bits by the read-modify-write instructions.
430
7 6 5
EN7 EN6 EN5
R/W R/W R/W
7 6 5
EN15 EN14 EN13
R/W R/W R/W
Figure 17.2-2 External Interrupt Request Register (EIRRn)
15 14 13
ER7 ER6 ER5
R/W R/W R/W
15 14 13
ER15 ER14 ER13
R/W R/W R/W
MB96300 Super Series Hardware Manual
4 3 2
EN4 EN3 EN2
R/W
R/W R/W
4 3 2
EN12 EN11 EN10
R/W
R/W R/W
12 11 10
ER4 ER3 ER2
R/W
R/W R/W
12 11 10
ER12 ER11 ER10 ER9
R/W
R/W R/W
Initial value
1 0
EN1 EN0 00000000
R/W R/W
1 0
EN9 EN8 00000000
R/W R/W
Initial value
9 8
ER1 ER0 00000000
B
R/W R/W
Initial value
9 8
00000000
ER8
B
R/W R/W
B
B