User's Manual

INTERRUPT CONTROLLER S3C2450X RISC MICROPROCESSOR
10-12
2.2 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).
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.
Register Address R/W Description Reset Value
INTMOD 1 0X4A000004 R/W Interrupt mode regiseter for group 1.
0 = IRQ mode
1 = FIQ mode
0x00000000
INTMOD 2 0X4A000044 R/W Interrupt mode regiseter for group 2.
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.
INTMOD1 Bit Description Initial State
INT_ADC [31] 0 = IRQ, 1 = FIQ 0
INT_RTC [30] 0 = IRQ, 1 = FIQ 0
INT_SPI1 [29] 0 = IRQ, 1 = FIQ 0
INT_UART0 [28] 0 = IRQ, 1 = FIQ 0
INT_IIC0 [27] 0 = IRQ, 1 = FIQ 0
INT_USBH [26] 0 = IRQ, 1 = FIQ 0
INT_USBD [25] 0 = IRQ, 1 = FIQ 0
INT_NAND [24] 0 = IRQ, 1 = FIQ 0
INT_UART1 [23] 0 = IRQ, 1 = FIQ 0
INT_SPI0 [22] 0 = IRQ, 1 = FIQ 0
INT_SDI0 [21] 0 = IRQ, 1 = FIQ 0
INT_SDI1 [20] 0 = IRQ, 1 = FIQ 0
INT_CFCON [19] 0 = IRQ, 1 = FIQ 0
INT_UART3 [18] 0 = IRQ, 1 = FIQ 0
INT_DMA [17] 0 = IRQ, 1 = FIQ 0
INT_LCD [16] 0 = IRQ, 1 = FIQ 0
INT_UART2 [15] 0 = IRQ, 1 = FIQ 0
INT_TIMER4 [14] 0 = IRQ, 1 = FIQ 0
INT_TIMER3 [13] 0 = IRQ, 1 = FIQ 0
INT_TIMER2 [12] 0 = IRQ, 1 = FIQ 0
INT_TIMER1 [11] 0 = IRQ, 1 = FIQ 0
INT_TIMER0 [10] 0 = IRQ, 1 = FIQ 0