Rev. 1.0, 02/00, page 104 of 1141
6.2.5
IRQ Status Register (IRQR)
0
0
1
0
R/(W)*
2
0
R/(W)*
3
0
4
0
R/(W)*
5
0
0
7
R/(W)*
R/(W)*
R/(W)*
IRQ5F
IRQ4F
IRQ3F
IRQ2F
IRQ1F
IRQ0F
0
6
—
—
—
—
Note: * Only 0 can be written, to clear the flag.
Bit :
Initial value :
R/W :
IRQR is an 8-bit readable/writable register that indicates the status of
IRQ 5 to IRQ 0 interrupt
requests.
IRQR is initialized to H'00 by a reset.
Bits 7 and 6
Reserved: These bits are always read as 0. Do not write 1 to them.
Bits 5 to 0
IR Q 5 to IR Q 0
Flags: These bits indicate the
status of IRQ 5 to IRQ 0 interrupt
requests.
Bit n
IRQnF
Description
0
[Clearing conditions]
(Initial value)
Cleared by reading IRQnF set to 1, then writing 0 in IRQnF
When IRQn interrupt exception handling is executed
1
[Setting conditions]
•
When a falling edge occurs in
,54Q
input while falling edge detection is set
(IRQnEG = 0)
•
When a rising edge occurs in
,54Q
input while rising edge detection is set
(IRQnEG = 0)
•
When a falling or rising edge occurs in
,54
3
input while both-edge detection is
set (IRQ0EG1 = 1)
(n = 5 to 0)