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530
IER—IRQ Enable Register
H'EE015
Interrupt Controller
Bit
Initial value
Read/Write
0
R/W
7
0
R/W
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
IRQ
5
to IRQ
0
enable
0
1
IRQ
5
to IRQ
0
interrupts are disabled
IRQ
5
to IRQ
0
interrupts are enabled
ISR—IRQ Status Register
H'EE016
Interrupt Controller
Bit
Initial value
Read/Write
0
7
0
6
0
R/(W)*
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
IRQ5 to IRQ0 flags
0
Note: * Only 0 can be written to clear the flag.
Bits 5 to 0
IRQ5F to IRQ0F
Setting and Clearing Conditions
1
(n = 5 to 0)
[Clearing conditions]
• Read IRQnF when IRQnF = 1, then write 0 in IRQnF.
• IRQnSC = 0,
IRQn
input is high, and interrupt exception
handling is being carried out.
• IRQnSC = 1 and IRQn interrupt exception handling is being
carried out.
[Setting conditions]
• IRQnSC = 0 and
IRQn
input is low.
• IRQnSC = 1 and
IRQn
input changes from high to low.
Содержание H8/3008
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