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S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X INTERRUPT STRUCTURE
5-7
INTERRUPT PROCESSING CONTROL POINTS
Interrupt processing can therefore be controlled in two ways: globally or by specific interrupt level and source. The
system-level control points in the interrupt structure are:
— Global interrupt enable and disable (by EI and DI instructions or by direct manipulation of SYM.0 )
— Interrupt level enable/disable settings (IMR register)
— Interrupt level priority settings (IPR register)
— Interrupt source enable/disable settings in the corresponding peripheral control registers
NOTE
When writing an application program that handles interrupt processing, be sure to include the necessary
register file address (register pointer) information.
Interrupt Request Register
(Read-only)
IRQ0-IRQ7,
Interrupts
Interrupt Mask
Register
Polling
Cycle
Interrupt Priority
Register
Global Interrupt Control (EI,
DI or SYM.0 manipulation)
S
R
Q
nRESET
EI
Vector
Interrupt
Cycle
Figure 5-4. Interrupt Function Diagram