Interrupt Processing Control Points - Samsung S3F80P5X User Manual

S3F80P5_UM_ REV1.00

INTERRUPT PROCESSING CONTROL POINTS

Interrupt processing can therefore be controlled in two ways: globally or by a specific interrupt level and source.
The system-level control points in the interrupt structure are, therefore:
•
Global interrupt enable and disable (by EI and DI instructions or by a 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 the part of your application program that handles the 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