Zilog Z80180 Manual do Utilizador Página 87

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Z8018x
Family MPU User Manual
72
UM005003-0703
Figure 33. TRAP Timing - 3rd Op Code Undefined
External Interrupts
The Z8X180 features four external hardware interrupt inputs:
NMI–Non-maskable interrupt
INT0–Maskable Interrupt Level 0
INT1–Maskable Interrupt Level 1
INT2–Maskable Interrupt Level 2
NMI
, INT1, and INT2 feature fixed interrupt response modes. INT0 has 3
different software programmable interrupt response modes—Mode 0,
Mode 1 and Mode 2.
NMI
- Non-Maskable Interrupt
The
NMI interrupt input is edge-sensitive and cannot be masked by
software. When
NMI is detected, the Z8X180 operates as follows:
Phi
A0
A19
WR
RD
MREQ
D0
D7
MI
TiT1 TiTiT1 T2 T3 T2T3 T1 T3T1 T2T3T1 T2 TTP T1 T2 T3
Memory
PC stacking
Restart from 0000H
Op Code
fetch cycle
0000H
SP-1
SP-2
PCLPCH
IX+d, IY+d
PC
3rd Op Code
Fetch Cycle
Undefined
Op Code
Read Cycle
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