Interrupt Processing Control Points; Interrupt Function Diagram - Samsung S3C8275X User Manual

S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X

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
When writing an application program that handles interrupt processing, be sure to include the necessary
register file address (register pointer) information.
EI
nRESET
IRQ0-IRQ7,
Interrupts
S Q
R
Interrupt Priority
Register
Figure 5-4. Interrupt Function Diagram
NOTE
Interrupt Request Register
(Read-only)
Interrupt Mask
Register
Global Interrupt Control (EI,
DI or SYM.0 manipulation)
INTERRUPT STRUCTURE
Polling
Cycle
Vector
Interrupt
Cycle
5-7