SH7055S Datasheet, PDF (133/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Section 7 Interrupt Controller (INTC)
7.1 Overview
The interrupt controller (INTC) ascertains the priority of interrupt sources and controls interrupt
requests to the CPU. The INTC has registers for setting the priority of each interrupt which can be
used by the user to order the priorities in which the interrupt requests are processed.
7.1.1 Features
The INTC has the following features:
• 16 levels of interrupt priority
By setting the twelve interrupt-priority level registers, the priorities of IRQ interrupts and on-
chip peripheral module interrupts can be set in 16 levels for different request sources.
• NMI noise canceler function
NMI input level bits indicate the NMI pin status. By reading these bits with the interrupt
exception service routine, the pin status can be confirmed, enabling it to be used as a noise
canceler.
• Notification of interrupt occurrence can be reported externally (IRQOUT pin)
For example, it is possible to request the bus if an external bus master is informed that a
peripheral module interrupt has occurred when the chip has released the bus.
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