Interrupt Request Register (Irq) - Samsung S3F80P5X User Manual

S3F80P5_UM_ REV1.00

INTERRUPT REQUEST REGISTER (IRQ)

You can poll bit values in the interrupt request register, IRQ (DCH, Set 1, Bank0), to monitor interrupt request
status for all levels in the microcontroller's interrupt structure. Each bit corresponds to the interrupt level of the
same number: bit 0 to IRQ0, bit 1 to IRQ1, and so on. A "0" indicates that no interrupt request is currently being
issued for that level; a "1" indicates that an interrupt request has been generated for that level.
IRQ bit values are read-only addressable using Register addressing mode. You can read (test) the contents of
the IRQ register at any time using bit or byte addressing to determine the current interrupt request status of
specific interrupt levels. After a reset, all IRQ status bits are cleared to "0."
You can poll IRQ register values even if a DI instruction has been executed (that is, if global interrupt processing
is disabled). If an interrupt occurs while the interrupt structure is disabled, the CPU will not service it. You can,
however, still detect the interrupt request by polling the IRQ register. In this way, you can determine which events
occurred while the interrupt structure was globally disabled.
MSB
Interrupt Request Register (IRQ)
DCH, Set 1, Bank 0 , Read-only
.7 .6 .5
Not
IRQ6
used
IRQ7
Interrupt Level Request Enable Bits:
0 = Interrupt level is not pending
1 = Interrupt level is pending
Figure 5-9. Interrupt Request Register (IRQ)
.4 .3 .2
IRQ2
IRQ3
IRQ4
INTERRUPT STRUCTURE
.1 .0 LSB
IRQ0
IRQ1
5-13