Zilog Z80180 Manual de usuario Pagina 96

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Z8018x
Family MPU User Manual
UM005003-0703
81
also the interrupt response sequence used for all internal interrupts
(except TRAP).
As depicted in Figure 41, the low-order byte of the vector table address
has the most significant three bits of the software programmable IL
register while the least significant five bits are a unique fixed value for
each interrupt (INT1
, INT2 and internal) source:
Figure 41. INT1, INT2 Vector Acquisition
INT1 and INT2 are globally masked by IEF1 is 0. Each is also
individually maskable by respectively clearing the ITE1 and ITE2 (bits
1,2) of the INT/TRAP control register to
0.
During RESET, IEF1, ITE1 and ITE2 bits are reset to
0.
Internal Interrupts
Internal interrupts (except TRAP) use the same vectored response mode
as INT1 and INT2. Internal interrupts are globally masked by IEF1 is 0.
Individual internal interrupts are enabled/disabled by programming each
Vector + 1
Vector
32 Bytes
Vector
Table
16-bit Vector
High-order 8 bits
Low-order 8 bits
of starting address
of starting address
IIL
Fixed Code
(5 bits)
Memory
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