Section 10 Interrupt Controller (INTC)
Rev.1.00 Dec. 13, 2005 Page 243 of 1286
REJ09B0158-0100
Section 10 Interrupt Controller (INTC)
The interrupt controller (INTC) determines the priority of interrupt sources and controls the flow
of interrupt requests to the CPU (SH-4A). The INTC has registers for setting the priority of each
of the interrupts and processing of interrupt requests follows the priority order set in these registers
by the user.
10.1 Features
SH-4 compatible specifications
•
Fifteen levels of external interrupt priority can be set
By setting the interrupt priority registers, the priorities of external interrupts can be selected
from 15 levels for individual request sources.
•
NMI noise canceler function
An NMI input-level bit indicates the NMI pin state. The bit can be read within the interrupt
exception handling routine to confirm the pin state and thus achieve a form of noise
cancellation.
•
NMI request masking when the block bit (BL) in the status register (SR) is set to 1
Masking or non-masking of NMI requests when the BL bit in SR is set to 1 can be selected.
Extended functions for the SH-4A
•
Automatically updates the IMASK bit in SR according to the accepted interrupt level
•
Thirty priority levels for interrupts from on-chip modules
By setting the interrupt priority registers (INT2PRI0 to INT2PRI7) for the on-chip module
interrupts, any of 30 priority levels can be assigned to the individual requesting sources.
•
User-mode interrupt disabling function
An interrupt mask level in the user interrupt mask level register (USERIMASK) can be
specified to disable interrupts which do not have higher priority than the specified mask level.
This setting can be made in user mode.
Figure 10.1 shows a block diagram of the INTC.
Summary of Contents for SH7780 Series
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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 ...
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