INTERRUPT STRUCTURE

S3C84E5/C84E9/P84E9

 

 

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.

EI

nRESET

IRQ0-IRQ7 Interrupts

SQ

R

Interrupt Priority

Register

Interrupt Request Register

(Read-only)

Interrupt Mask

Register

Polling

Cycle

Vector

Interrupt

Cycle

Global Interrupt Control (EI,

DI or SYM.0 manipulation)

Figure 5-4. Interrupt Function Diagram

5-8

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Samsung S3C84E5 user manual Interrupt Processing Control Points, Interrupt Function Diagram