Section 5 Interrupt Controller
Rev. 3.00 Mar. 14, 2006 Page 87 of 804
REJ09B0104-0300
Section 5 Interrupt Controller
5.1 Features
•
Two interrupt control modes
Any of two interrupt control modes can be set by means of bits INTM1 and INTM0 in the
interrupt control register (INTCR).
•
Priority can be assigned by the interrupt priority register (IPR)
IPR provides for setting interrupt priory. Eight levels can be set for each module for all
interrupts except for the interrupt requests listed below. The following six interrupt requests
are given priority of 8, therefore they are accepted at all times.
NMI
General illegal instructions
Trace
Trap instructions
CPU address error
DMA address error*
•
Independent vector addresses
All interrupt sources are assigned independent vector addresses, making it unnecessary for the
source to be identified in the interrupt handling routine.
•
16 external interrupts
NMI is the highest-priority interrupt, and is accepted at all times. Rising edge or falling edge
detection can be selected for NMI. Falling edge, rising edge, or both edge detection, or level
sensing, can be selected for
IRQ14
to
IRQ0
.
•
DMAC control
DMAC can be activated by means of interrupts.
•
CPU priority control function
The priority levels can be assigned to the CPU and DMAC. The priority level of the CPU can
be automatically assigned on an exception generation. Priority can be given to the CPU
interrupt exception handling over that of the DMAC transfer.
Note: * A DMA address error is generated within the DMAC.
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