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INTERRUPT STRUCTURE S3C9228/P9228
5-2
INTERRUPT PENDING FUNCTION TYPES
When the interrupt service routine has executed, the application program's service routine must clear the
appropriate pending bit before the return from interrupt subroutine (IRET) occurs.
INTERRUPT PRIORITY
Because there is not a interrupt priority register in SAM87RCRI, the order of service is determined by a sequence
of source which is executed in interrupt service routine.
S
R
Q
Interrupt Pending
Register
Global Interrupt
Control (EI, Di instruction)
Vector
Interrupt
Cycle
Interrpt priority
is determind by
software polling
method
"EI" Instruction
Execution
RESET
Source
Interrupts
Source
Interrupt
Enable
Figure 5-2. Interrupt Function Diagram