S3C2416X RISC MICROPROCESSOR
INTERRUPT CONTROLLER
10-3
1.1 INTERRUPT CONTROLLER OPERATION
1.1.1 F-bit and I-bit of Program Status Register (PSR)
If the F-bit of PSR in ARM926EJ CPU is set to 1, the CPU does not accept the Fast Interrupt Request (FIQ) from
the interrupt controller. Likewise, If I-bit of the PSR is set to 1, the CPU does not accept the Interrupt Request
(IRQ) from the interrupt controller. So, the interrupt controller can receive interrupts by clearing F-bit or I-bit of the
PSR to 0 and setting the corresponding bit of INTMSK to 0.
1.1.2 Interrupt
Mode
The ARM926EJ has two types of Interrupt mode: FIQ or IRQ. All the interrupt sources determine which mode is
used at interrupt request.
1.1.3 Interrupt Pending Register
The
S3C2416
has two interrupt pending resisters: source pending register (SRCPND) and interrupt pending
register (INTPND). These pending registers indicate whether or not an interrupt request is pending. When the
interrupt sources request interrupt service, the corresponding bits of SRCPND register are set to 1, and at the
same time, only one bit of the INTPND register is set to 1 automatically after arbitration procedure. If interrupts are
masked, the corresponding bits of the SRCPND register are set to 1. This does not cause the bit of INTPND
register changed. When a pending bit of the INTPND register is set, the interrupt service routine starts whenever
the I-flag or F-flag is cleared to 0. The SRCPND and INTPND registers can be read and written, so the service
routine must clear the pending condition by writing a 1 to the corresponding bit in the SRCPND register first and
then clear the pending condition in the INTPND registers by using the same method.
1.1.4 Interrupt Mask Register
This register indicates that an interrupt has been disabled if the corresponding mask bit is set to 1. If an interrupt
mask bit of INTMSK is 0, the interrupt will be serviced normally. If the corresponding mask bit is 1 and the
interrupt is generated, the source pending bit will be set.
Содержание S3C2416
Страница 33: ...S3C2416X RISC MICROPROCESSOR PRODUCT OVERVIEW 1 5 3 BLOCK DIAGRAM Figure 1 1 S3C2416X Block Diagram ...
Страница 38: ...PRODUCT OVERVIEW S3C2416X RISC MICROPROCESSOR 1 10 153 AIN 1 U14 195 EINT 10 GPG2 K15 237 SDATA 14 C18 ...
Страница 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Страница 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Страница 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Страница 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Страница 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Страница 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Страница 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Страница 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Страница 455: ...S3C2416X RISC MICROPROCESSOR HSMMC CONTROLLER 20 9 4 9 SD COMMAND ISSUE SEQUENCE Figure 20 9 Timeout Setting Sequence ...
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Страница 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Страница 653: ...S3C2416X RISC MICROPROCESSOR ELECTRICAL DATA 26 15 Figure 26 14 SDRAM READ WRITE Timing Trp 2 Trcd 2 Tcl 2 DW 16 bit ...
Страница 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...
Страница 672: ...MECHANICAL DATA S3C2416X RISC MICROPROCESSOR 30 2 Figure 27 2 330 FBGA 1414 Package Dimension 2 Bottom View ...