Rev. 1.0, 09/02, page 70 of 568
5.3.4
IRQ Status Register (ISR)
ISR is an 8-bit readable/writable register that indicates the status of IRQ0 to IRQ5 interrupt
requests.
Bit
Bit Name
Initial Value
R/W
Description
7,
6
All
0
R/W
Reserved
Only 0 should be written to these bits.
5
4
3
2
1
0
IRQ5F
IRQ4F
IRQ3F
IRQ2F
IRQ1F
IRQ0F
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
[Setting conditions]
When the interrupt source selected by the ISCR
registers occurs
[Clearing conditions]
•
Cleared by reading IRQnF flag when IRQnF
= 1, then writing 0 to IRQnF flag
•
When interrupt exception handling is
executed when low-level detection is set
and
IRQn
input is high
•
When IRQn interrupt exception handling is
executed when falling, rising, or both-edge
detection is set
•
When the DTC is activated by an IRQn
interrupt, and the DISEL bit in MRB of the
DTC is cleared to 0
Содержание H8S/2627
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