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82
Bit
Initial value
Read/Write
7
—
0
—
These bits indicate IRQ to IRQ flag
interrupt request status
Note: Only 0 can be written, to clear flags.
*
6
—
0
—
5
IRQ5F
0
R/(W) *
4
IRQ4F
0
R/(W) *
3
IRQ3F
0
R/(W) *
2
IRQ2F
0
R/(W) *
1
IRQ1F
0
R/(W) *
0
IRQ0F
0
R/(W) *
5
0
IRQ to IRQ flags
5
0
Reserved bits
ISR is initialized to H'00 by a reset and in hardware standby mode.
Bits 7 and 6—Reserved: These bits can not be modified and are always read as 0.
Bits 5 to 0—IRQ
5
to IRQ
0
Flags (IRQ5F to IRQ0F): These bits indicate the status of IRQ
5
to
IRQ
0
interrupt requests.
Bits 5 to 0
IRQ5F to IRQ0F Description
0
[Clearing conditions]
(Initial value)
0 is written in IRQnF after reading the IRQnF flag when IRQnF = 1.
IRQnSC = 0,
IRQn
input is high, and interrupt exception handling is carried out.
IRQnSC = 1 and IRQn interrupt exception handling is carried out.
1
[Setting conditions]
IRQnSC = 0 and
IRQn
input is low.
IRQnSC = 1 and
IRQn
input changes from high to low.
Note: n = 5 to 0
5.2.4
IRQ Enable Register (IER)
IER is an 8-bit readable/writable register that enables or disables IRQ
5
to IRQ
0
interrupt requests.
Bit
Initial value
Read/Write
7
—
0
R/W
These bits enable or disable IRQ to IRQ interrupts
6
—
0
R/W
5
IRQ5E
0
R/W
4
IRQ4E
0
R/W
3
IRQ3E
0
R/W
2
IRQ2E
0
R/W
1
IRQ1E
0
R/W
0
IRQ0E
0
R/W
5
0
IRQ to IRQ enable
5
0
Reserved bits
IER is initialized to H'00 by a reset and in hardware standby mode.
Содержание H8/3008
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