Datasheet

Appendix B Internal I/O Registers
Rev. 4.00 Sep 27, 2006 page 1016 of 1130
REJ09B0327-0400
ISR—IRQ Status Register H'FEEB Interrupt Controller
7
IRQ7F
0
R/(W)
*
6
IRQ6F
0
R/(W)
*
5
IRQ5F
0
R/(W)
*
4
IRQ4F
0
R/(W)
*
3
IRQ3F
0
R/(W)
*
0
IRQ0F
0
R/(W)
*
2
IRQ2F
0
R/(W)
*
1
IRQ1F
0
R/(W)
*
Bit
Initial value
Read/Write
IRQ7 to IRQ0 flags
0 [Clearing conditions]
• Cleared by reading IRQnF when set to 1, then writing 0 in IRQnF
• When interrupt exception handling is executed while low-level detection
is set (IRQnSCB = IRQnSCA = 0) and IRQn input is high
*
• When IRQn interrupt exception handling is executed while falling, rising,
or both-edge detection is set (IRQnSCB = 1 or IRQnSCA = 1)
*
1 [Setting conditions]
• When IRQn input goes low when low-level detection is set
(IRQnSCB = IRQnSCA = 0)
• When a falling edge occurs in IRQn input while falling edge detection is
set (IRQnSCB = 0, IRQnSCA = 1)
• When a rising edge occurs in IRQn input while rising edge detection is
set (IRQnSCB = 1, IRQnSCA = 0)
• When a falling or rising edge occurs in IRQn input while both-edge
detection is set (IRQnSCB = IRQnSCA = 1)
Note: * Only 0 can be written, to clear the flag.
Notes: n = 7 to 0
* When a product, in which a DTC is incorporated, is used in the
following settings, the corresponding flag bit is not automatically
cleared even when exception handling, which is a clear condition, is
executed and the bit is held at 1.
(1) When DTCEA3 is set to 1 (ADI is set to an interrupt source),
IRQ4F flag is not automatically cleared.
(2) When DTCEA2 is set to 1 (ICIA is set to an interrupt source),
IRQ5F flag is not automatically cleared.
(3) When DTCEA1 is set to 1 (ICIB is set to an interrupt source),
IRQ6F flag is not automatically cleared.
(4) When DTCEA0 is set to 1 (OCIA is set to an interrupt souce),
IRQ7F flag is not automatically cleared.
When activation interrupt sources of DTC and IRQ interrupts are used
with the above combinations, clear the interrupt flag by software in the
interrupt handling routine of the corresponding IRQ.