INTERRUPT CONTROLLER
S3C2416X RISC MICROPROCESSOR
10-10
2.1 SOURCE PENDING (SRCPND) REGISTER
The SRCPND register is composed of 32 bits each of which is related to an interrupt source. Each bit is set to 1 if
the corresponding interrupt source generates the interrupt request and waits for the interrupt to be serviced.
Accordingly, this register indicates which interrupt source is waiting for the request to be serviced. Note that each
bit of the SRCPND register is automatically set by the interrupt sources regardless of the masking bits in the
INTMASK register. In addition, the SRCPND register is not affected by the priority logic of interrupt controller.
In the interrupt service routine for a specific interrupt source, the corresponding bit of the SRCPND register has to
be cleared to get the interrupt request from the same source correctly. If you return from the ISR without clearing
the bit, the interrupt controller operates as if another interrupt request came in from the same source. In other
words, if a specific bit of the SRCPND register is set to 1, it is always considered as a valid interrupt request
waiting to be serviced.
The time to clear the corresponding bit depends on the user's requirement. If you want to receive another valid
request from the same source, you should clear the corresponding bit first, and then enable the interrupt.
You can clear a specific bit of the SRCPND register by writing a data to this register. It clears only the bit positions
of the SRCPND corresponding to those set to one in the data. The bit positions corresponding to those that are
set to 0 in the data remains as they are.
SOURCE PENDING (SRCPND 1) REGISTER FOR GROUP 1
Register
Address
R/W
Description
Reset Value
SRCPND 1
0X4A000000 R/W Indicate the interrupt request status for group 1.
0 = The interrupt has not been requested.
1 = The interrupt source has asserted the interrupt
request.
0x00000000
SRCPND 2
0X4A000040 R/W Indicate the interrupt request status for group 2..
0 = The interrupt has not been requested.
1 = The interrupt source has asserted the interrupt
request.
0x00000000
SRCPND 1
Bit
Description
Initial State
INT_ADC
[31]
0 = Not requested, 1 = Requested
0
INT_RTC
[30]
0 = Not requested, 1 = Requested
0
Reserved
[29]
0 = Not requested, 1 = Requested
0
INT_UART0
[28]
0 = Not requested, 1 = Requested
0
INT_IIC0
[27]
0 = Not requested, 1 = Requested
0
INT_USBH
[26]
0 = Not requested, 1 = Requested
0
INT_USBD
[25]
0 = Not requested, 1 = Requested
0
INT_NAND
[24]
0 = Not requested, 1 = Requested
0
INT_UART1
[23]
0 = Not requested, 1 = Requested
0
INT_SPI0
[22]
0 = Not requested, 1 = Requested
0
INT_SDI0
[21]
0 = Not requested, 1 = Requested
0
INT_SDI1
[20]
0 = Not requested, 1 = Requested
0
Reserved
[19]
0 = Not requested, 1 = Requested
0
Summary of Contents for S3C2416
Page 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Page 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Page 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Page 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Page 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Page 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Page 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Page 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Page 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Page 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Page 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...