HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 163

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

5.2.1
The NMI interrupt has priority 16 and is always accepted. Input at the NMI pin is detected by
edge. Use the NMI edge select bit (NMIE) in the interrupt control register (ICR) to select either
the rising or falling edge. NMI interrupt exception handling sets the interrupt mask level bits (I3–
I0) in the status register (SR) to level 15.
5.2.2
A user break interrupt has priority level 15 and occurs when the break condition set in the user
break controller (UBC) is satisfied. User break interrupt exception handling sets the interrupt mask
level bits (I3–I0) in the status register (SR) to level 15. For more information about the user break
interrupt, see section 6, User Break Controller.
5.2.3
The H-UDI interrupt has a priority level of 15, and is generated when an H-UDI interrupt
instruction is serially input. H-UDI interrupt exception processing sets the interrupt mask bits (I3–
I0) in the status register (SR) to level 15. See section 17, Hitachi User Debug Interface, for details
of the H-UDI interrupt.
5.2.4
IRL interrupts are requested by input from pins IRL3–IRL0. Fifteen interrupts, IRL15–IRL1, can
be input externally via pins IRL3–IRL0. The priority levels of interrupts IRL15–IRL0 are 15–1,
respectively, and their vector numbers are 71–64. Set the vector numbers with the interrupt vector
mode select (VECMD) bit of the interrupt control register (ICR) to enable external input. External
input of vector numbers consists of vector numbers 0–127 from the external vector input pins
(D7–D0). When an external vector is used, 0 is input to D7. Internal vectors are called auto-
vectors and vectors input externally are called external vectors. Table 5.3 lists IRL priority levels
and auto vector numbers.
When an IRL interrupt is accepted in external vector mode, the IRL interrupt level is output from
the interrupt acceptance level output pins (A3–A0). The external vector fetch pin (IVECF) is also
asserted. The external vector number is read from pins D7–D0 at this time.
IRL interrupt exception processing sets the interrupt mask level bits (I3 to I0) in the status register
(SR) to the priority level value of the IRL interrupt that was accepted.
NMI Interrupt
User Break Interrupt
H-UDI Interrupt
IRL Interrupts
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