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Interrupt Control Unit
8-7
8.1.4.4 Breakpoint Interrupt (Interrupt Type 03h)
An interrupt caused by the 1-byte version of the INT instruction (INT3).
8.1.4.5 INTO Detected Overflow Exception (Interrupt Type 04h)
Generated by an INTO instruction if the OF bit is set in the Processor Status Flags (FLAGS)
Register.
8.1.4.6 Array BOUNDS Exception (Interrupt Type 05h)
Generated by a BOUND instruction if the array index is outside the array bounds. The array
bounds are located in memory at a location indicated by one of the instruction operands.
The other operand indicates the value of the index to be checked.
8.1.4.7 Unused Opcode Exception (Interrupt Type 06h)
Generated if execution is attempted on undefined opcodes.
8.1.4.8 ESC Opcode Exception (Interrupt Type 07h)
Generated if execution of ESC opcodes (D8h–DFh) is attempted. The microcontrollers do
not check the escape opcode trap bit. The return address of this exception points to the
ESC instruction that caused the exception. If a segment override prefix preceded the ESC
instruction, the return address points to the segment override prefix.
Note: All numeric coprocessor opcodes cause a trap. The Am186ER and Am188ER
microcontrollers do not support the numeric coprocessor interface.