Section 9 Interrupt Controller (INTC)
Rev. 1.00 Oct. 01, 2007 Page 305 of 1956
REJ09B0256-0100
9.5 Operation
9.5.1 Interrupt
Sequence
The sequence of interrupt operations is described below. Figure 9.4 is the flowchart of the
operations.
1. The interrupt request sources send interrupt request signals to the INTC.
2. The INTC selects the highest-priority interrupt from the interrupt requests sent, following the
priority levels set in INTPRI and INT2PRI0 to INT2PRI14. Lower-priority interrupts are held
pending. If two of these interrupts have the same priority level or if multiple interrupts occur
within a single module, the interrupt with the highest priority is selected according to table 9.7.
3. The priority level of the interrupt selected by the INTC is compared with the interrupt mask
level (IMASK) set in SR of the CPU. If the priority level is higher than the mask level, the
INTC accepts the interrupt and sends an interrupt request signal to the CPU.
4. The CPU accepts an interrupt at a break in instructions.
5. The interrupt source code is set in the interrupt event register (INTEVT).
6. SR and program counter (PC) are saved to SSR and SPC, respectively. R15 is saved to SGR at
this time.
7. The BL, MD, and RB bits in SR are set to 1.
8. Execution jumps to the start address of the interrupt exception handling routine (the sum of the
value set in the vector base register (VBR) and H'0000 0600).
In the exception handling routine, execution may branch with the INTEVT value used as its offset
in order to identify the interrupt source. This enables execution to branch to the handling routine
for the individual interrupt source.
Notes: 1. When the INTMU bit in the CPU operating mode register (CPUOPM) is set to 1, the
interrupt mask level (IMASK) in SR is automatically set to the level of the accepted
interrupt. When the INTMU bit is cleared to 0, the IMASK value in SR is not affected
by the accepted interrupt.
2. The interrupt source flag should be cleared in the interrupt handler. To ensure that an
interrupt source that should have been cleared is not inadvertently accepted again, read
the interrupt source flag after it has been cleared, wait for the time shown in table 9.8,
and then clear the BL bit or execute an RTE instruction.
3. For some interrupt sources, the interrupt mask setting (INTMSK) for each interrupt
source must be cleared by using INTMSKCLR.
Summary of Contents for SH7763
Page 2: ...Rev 1 00 Oct 01 2007 Page ii of lxvi ...
Page 122: ...Section 2 Programming Model Rev 1 00 Oct 01 2007 Page 56 of 1956 REJ09B0256 0100 ...
Page 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Page 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Page 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Page 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Page 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Page 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Page 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Page 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Page 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Page 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Page 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Page 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Page 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Page 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Page 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Page 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
Page 2025: ......
Page 2026: ...SH7763 Hardware Manual ...