IA186ES/IA188ES
Data Sheet
8-Bit/16-Bit Microcontrollers
November 15, 2011
With the exception of int0, the seven external maskable interrupt request pins are
multifunctional. One function is for direct-interrupt requests. The int6 and int5 are edge-
triggered. The int4–int0 may be either level- or edge-triggered.
When configured in cascade mode, int1 and int0 interface with an external 82C59A-type
interrupt controller. When int0 is configured for cascade mode, the function of int2 is
automatically switched to its inta0_n role. Similarly, when int1 is configured for cascade mode,
int3 is switched to its inta1_n role. An external 82C59A-compatible interrupt controller may be
used as the system master by programming the internal interrupt controller to slave mode, but
int6–int4 cannot be used.
Although other interrupts are disabled when another is accepted, these may be re-enabled by
setting the Interrupt Enable Flag (IF) in the Processor Status Flags register during the Interrupt
Service Routine (ISR). Setting IF permits interrupts of equal or greater priority to interrupt the
currently running ISR.
Further interrupts from the same source will be blocked until the corresponding bit in the In-
Service (INSERV) register is cleared. When set to 1, the Special Fully Nested mode (SFNM) is
invoked for int0 and int1 in the INT0 and INT1 Control registers, respectively. In this mode, a
new interrupt may be generated by these sources regardless of the in-service bit. The following
table shows the priorities of the interrupts at POR.
4.17 Interrupt Types
Table 14 presents interrupt names, types, vector table address, End-of-Interrupt (EOI) type,
overall priority, and related instructions.
Table 14. Interrupt Types
Vector
Interrupt
Type
Table
Address
EOI
Type
Overall
Priority
Related
Instructions
Interrupt Name
a
00h
01h
02h
03h
04h
05h
06h
00h
04h
08h
0ch
10h
14h
18h
NA
NA
NA
NA
NA
NA
NA
1
1A
1B
1
DIV, IDIV
All
Divide Error Exception
b
Trace Interrupt
Non-maskable Interrupt (NMI)
–
a
INT3
INT0
BOUND
Breakpoint Interrupt
b
1
INT0 Detected Overflow Exception
a
1
Array Bounds Exception
a
1
Undefined
Opcodes
Unused Opcode Exception
a,b
07h
08h
12h
1ch
20h
48h
NA
08h
08h
1
ESC Opcodes
ESC Opcode Exception
d,e
–
2A
2B
Timer0 Interrupt
d,e
–
Timer1 Interrupt
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