Chapter 8 Intc; Features - Renesas NU85E Preliminary User's Manual

The interrupt control unit (INTC), which can process interrupt requests generated for a total of 67 sources,
processes various types of interrupt requests from external sources. In addition, exception processing can be started
(exception trap) due to a TRAP instruction (software exception) or due to the generation of an exception event
(fetching of an illegal opcode).
An interrupt is an event that is generated independently of program execution, and an exception is an event that is
generated dependent on program execution. Generally, the processing of an exception takes precedence over the
processing of an interrupt.

8.1 Features

• Interrupt
Non-maskable interrupt: 3 sources
Maskable interrupt: 64 sources
8 levels programmable priorities (maskable interrupt)
Multiple interrupt control according to priority
Mask specification to each maskable interrupt request
• Exception
Software exception: 32 sources
Exception trap: 1 source (illegal opcode exception)
These interrupt/exception sources are listed in Table 8-1.
Type Classifi-
cation
Reset Interrupt
Non-maskable Interrupt
Interrupt
Interrupt
Software Exception TRAP0n
exception
Exception TRAP1n
Exception trap Exception ILGOP
Maskable Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
Note n: value of 0 to FH
206

CHAPTER 8 INTC

Table 8-1. Interrupt/Exception List (1/3)
Interrupt/Exception Source
Name Control Register Generating Source
−
RESET
−
NMI0
−
NMI1
−
NMI2
−
Note
−
Note
−
INT0 PIC0
INT1 PIC1
INT2 PIC2
INT3 PIC3
INT4 PIC4
INT5 PIC5
INT6 PIC6
Preliminary User's Manual A14874EJ3V0UM
Default
Priority
−
DCRESZ input
−
DCNMI0 input
−
DCNMI1 input
−
DCNMI2 input
TRAP instruction −
TRAP instruction −
−
Illegal opcode
INT0 input 0
INT1 input 1
INT2 input 2
INT3 input 3
INT4 input 4
INT5 input 5
INT6 input 6
Exception Handler Restored
Code Address
0000H 00000000H Undefined
0010H 00000010H nextPC
0020H 00000020H nextPC
0030H 00000030H nextPC
004nH 00000040H nextPC
005nH 00000050H nextPC
0060H 00000060H nextPC
0080H 00000080H nextPC
0090H 00000090H nextPC
00A0H 000000A0H nextPC
00B0H 000000B0H nextPC
00C0H 000000C0H nextPC
00D0H 000000D0H nextPC
00E0H 000000E0H nextPC
PC