Section 9 Interrupt Controller (INTC)
Rev. 1.00 Oct. 01, 2007 Page 309 of 1956
REJ09B0256-0100
9.7 Usage
Notes
9.7.1
Example of Interrupt Handling Routine for Level-Encoded IRL and Level-Sensed
IRQ
If an interrupt request is accepted when level-sensed IRQ or level-encoded IRL interrupt request is
selected, the held request must be cleared in the interrupt handling routine. Figure 9.5 shows an
example of clearing the interrupt request held in the detection circuit.
Interrupt handing
Clear the level-encoded IRL or level-sensed IRQ interrupt
request source.
Notify acceptance of the interrupt to external devices by
using GPIO output or local bus space.
Wait for the level-encoded IRL or level-sensed IRQ
interrupt request to be cleared.
An appropriate time is necessary for the interrupt request
input to the IRQ/IRL pin to be cancelled and for the INTC
to detect the cancellation (more than 8 bus clock cycles).
Clear the interrupt request held in the detection circuit.
Set the corresponding mask bit to 1 to clear the interrupt
request held in the detection circuit.
1. Write to the GPIO register or
local bus space.
2. Read the address to which
writing has been made.
1. Set the corresponding bit in
INTMSK0/INTMSK1.
2. Set the corresponding bit in
INTMSKCLR0/INTMSKCLR1.
3. Read INTMSK0/INTMSK1.
Start of level-encoded IRL or level-sensed IRQ interrupt
handing
End of level-encoded IRL or level-sensed IRQ interrupt
handing
Figure 9.5 Example of Interrupt Handling Routine
After the CPU accepts an interrupt request, acceptance of the request should be notified to the
external devices and the request should be cancelled. For example, acceptance can be notified by
outputting the accepted level and pin-related information via the GPIO (general I/O port) and
writing the acceptance information to a specific address in the local bus space. Here, writing to the
GPIO register or local bus space and reading from the location should be consecutively executed.
When clearing the interrupt requests held in the detection circuit, adequate time is necessary for
the CPU to detect the cancellation of the interrupt request. To secure the time, writing to
Содержание SH7763
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Страница 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Страница 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
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Страница 686: ...Section 14 Direct Memory Access Controller DMAC Rev 1 00 Oct 01 2007 Page 620 of 1956 REJ09B0256 0100 ...
Страница 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Страница 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
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Страница 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Страница 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Страница 1060: ...Section 23 Gigabit Ethernet Controller GETHER Rev 1 00 Oct 01 2007 Page 994 of 1956 REJ09B0256 0100 ...
Страница 1062: ...Section 24 IP Security Accelerator SECURITY Rev 1 00 Oct 01 2007 Page 996 of 1956 REJ09B0256 0100 ...
Страница 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Страница 1184: ...Section 27 Serial Communication Interface with FIFO SCIF Rev 1 00 Oct 01 2007 Page 1118 of 1956 REJ09B0256 0100 ...
Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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