Zilog Z80180 Manual de usuario Pagina 95

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Z8018x
Family MPU User Manual
80
UM005003-0703
Figure 40. INT0
Interrupt Mode 2 Timing Diagram
INT1, INT2
The operation of external interrupts INT1 and INT2 is a vector mode
similar to INT0
Mode 2. The difference is that INT1 and INT2 generate
the low-order byte of vector table address using the IL (Interrupt Vector
Low) register rather than fetching it from the data bus. This difference is
A0
A19
WR
RD
MREQ
D0
D7
M1
PC
SP-1
SP-2
INT0
T1
T3
TW*
T2TiT2 T1
T3
T1
T2
T3
TW*
*Two Wait States are automatically inserted
ST
IORQ
Vector
Vector+1
Vector Lower
Address Read
PC is pushed onto stack
Interrupt
Op Code
T1
T1
T1
T2 T3
T2
T2
T3
Starting address
PCH
PCL
Starting Address
Starting Address
(Upper Address)
(Lower Address)
Lower Vector
Phi
Manipulation
Cycle
Fetch Cycle
INT0
Acknowledge Cycle
Last MC
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