
Z8018x
Family MPU User Manual
UM005003-0703
85
Z8X180. Figure 43 illustrates the INT1, INT2 and internal interrupts
timing.
Table 10. RETI Control Signal States
Machine
Cycle States Address Data
MI
RD WR MREQ IORQ M1E=1 M1E=0 HALT ST
1 T1-T3 1st
Op Code
EDH 0 1 0 1 0 1 1 0
2TI-T32nd
Op Code
4DH 0 1 0 1 0 1 1 1
3T1Don't
Care
3-state 1 1 1 1 1 1 1 1
4T1Don't
Care
3-state 1 1 1 1 1 1 1 1
5T1Don't
Care
3-state 1 1 1 1 1 1 1 1
6 T1-T3 1st
Op Code
EDH 0 1 0 1 0 0 1 1
7T1Don't
Care
3-state 1 1 1 1 1 1 1 1
8 T1-T3 2nd
Op Code
4DH 0 1 0 1 0 1 1 1
9T1-T3SPdata01011111
10 T1-T3 SP+1 data 0 1 0 1 1 1 1 1
IOC affects the IORQ/RD signals. M1E affects the assertion of M1. One state also reflects a 1 while
the other reflects a 0
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