Laptop User Manual

S3C2440A RISC MICROPROCESSOR INTERRUPT CONTROLLER

14-9

INTERRUPT MODE (INTMOD) REGISTER

This register is composed of 32 bits each of which is related to an interrupt source. If a specific bit is set to 1, the

corresponding interrupt is processed in the FIQ (fast interrupt) mode. Otherwise, it is processed in the IRQ mode

(normal interrupt).

Please note that only one interrupt source can be serviced in the FIQ mode in the interrupt controller (you should

use the FIQ mode only for the urgent interrupt). Thus, only one bit of INTMOD can be set to 1.

INTMOD 0X4A000004 R/W Interrupt mode regiseter.

0 = IRQ mode 1 = FIQ mode

0x00000000

Note

If an interrupt mode is set to FIQ mode in the INTMOD register, FIQ interrupt will not affect both INTPND and

INTOFFSET registers. In this case, the two registers are valid only for IRQ mode interrupt source.