Interrupt Control Registers - Hitachi H8/3827R Series Hardware Manual

3.3.2

Interrupt Control Registers

Table 3.3 lists the registers that control interrupts.
Table 3.3 Interrupt Control Registers
Name
IRQ edge select register
Interrupt enable register 1
Interrupt enable register 2
Interrupt request register 1
Interrupt request register 2
Wakeup interrupt request register
Wakeup edge select register
Note: * Write is enabled only for writing of 0 to clear a flag.
1. IRQ edge select register (IEGR)
Bit
—
Initial value
Read/Write —
IEGR is an 8-bit read/write register used to designate whether pins IRQ
edge sensing or falling edge sensing.
Bits 7 to 5: Reserved bits
Bits 7 to 5 are reserved: they are always read as 1 and cannot be modified.
Bit 4: IRQ edge select (IEG4)
4
Bit 4 selects the input sensing of the IRQ
Bit 4
IEG4 Description
Falling edge of IRQ
0
Rising edge of IRQ
1
Abbreviation
IEGR
IENR1
IENR2
IRR1
IRR2
IWPR
WEGR
7 6 5
— —
1 1 1
— —
4
and ADTRG pin input is detected
4
and ADTRG pin input is detected
4
R/W
R/W
R/W
R/W
R/W*
R/W*
R/W*
R/W
4 3
IEG4 IEG3
0 0
R/W R/W
pin and ADTRG pin.
Initial Value Address
H'E0 H'FFF2
H'00 H'FFF3
H'00 H'FFF4
H'20 H'FFF6
H'00 H'FFF7
H'00 H'FFF9
H'00 H'FF90
2 1
IEG2 IEG1 IEG0
0 0
R/W R/W R/W
to IRQ
are set to rising
4 0
(initial value)
0
0
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