Section 10 Interrupt Controller (INTC)
Rev.1.00 Dec. 13, 2005 Page 297 of 1286
REJ09B0158-0100
upward compatibility with the “level-sense IRQ mode” of current SH-4 products (here, too, the
detection of high or low levels is selectable).
Note: When high-or low-level detection is selected, once the interrupt request has been detected,
the INTC holds the interrupt request as an interrupt source in INTREQ even if the level on
the IRQ interrupt pin has been changed and canceled. The interrupt source is held until the
CPU accepts any interrupt request (IRQ or not) or the corresponding interrupt mask bit is
set to 1. Moreover, when the holding function is selected by clearing the LSH bit in ICR0
to 0, the interrupt request is held in the detection circuit. In this case, clearing of the
interrupt request in the exception handling routine must be followed by clearing of the
interrupt source setting being held in INTREQ. For details, see section 10.7 Usage Notes.
When the INTMU bit in CPUOPM is set to 1, the interrupt mask level (IMASK) in SR is
automatically modified to the level of an accepted interrupt. When the INTMU bit is cleared to 0,
the IMASK value in SR is not affected by the acceptance of an interrupt.
10.4.3 IRL
Interrupts
IRL interrupts are input as combinations of levels on pins IRQ/
IRL7
to IRQ/
IRL4
or IRQ/
IRL3
to
IRQ/
IRL0
. The priority level is the value indicated by the levels (active low) on pins IRQ/
IRL7
to
IRQ/
IRL4
or IRQ/
IRL3
to IRQ/
IRL0
. The low level on all pins from IRQ/
IRL7
to IRQ/
IRL4
or
IRQ/
IRL3
to IRQ/
IRL0
corresponds to the highest-level interrupt request (interrupt priority level
15), and the high level on all pins corresponds to no interrupt request (interrupt priority level 0).
Figure 10.2 shows an example of IRL interrupt connection, and table 10.11 shows the
correspondence between the combinations of levels on the IRL pins and priority.
Priority
encoder
Interrupt
requests
SH7780
IRQ/
IRL3
to
IRQ/
IRL0
IRQ/
IRL7
to
IRQ/
IRL4
IRL7
to
IRL4
IRL3
to
IRL0
Interrupt
requests
Priority
encoder
..
.
..
.
Figure 10.2 Example of IRL Interrupt Connection
Summary of Contents for SH7780 Series
Page 2: ...Rev 1 00 Dec 13 2005 Page ii of l ...
Page 28: ...Rev 1 00 Dec 13 2005 Page xxviii of l ...
Page 50: ...Rev 1 00 Dec 13 2005 Page l of l ...
Page 82: ...Section 1 Overview Rev 1 00 Dec 13 2005 Page 32 of 1286 REJ09B0158 0100 ...
Page 122: ...Section 3 Instruction Set Rev 1 00 Dec 13 2005 Page 72 of 1286 REJ09B0158 0100 ...
Page 146: ...Section 4 Pipelining Rev 1 00 Dec 13 2005 Page 96 of 1286 REJ09B0158 0100 ...
Page 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Page 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Page 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
Page 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Page 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Page 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Page 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Page 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Page 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Page 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Page 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
Page 1336: ...Rev 1 00 Dec 13 2005 Page 1286 of 1286 REJ09B0158 0100 ...
Page 1339: ......
Page 1340: ...SH7780 Hardware Manual ...