Z84C90_12 Datasheet, PDF (40/56 Pages) Zilog, Inc. – KIO Serial/Parallel Counter/Timer

Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
33
Figure 37 shows the timing for the RETI sequence.
ED
Op Code Fetch 1
4D
Op Code Fetch 2
T4
T1
T2
T3
T4
T1
T2
T3
T4
T1
Clock
74
M1
74
RD
12
DATA
73
IEI
22
71
IEO
Figure 37. RETI Timing Standard Function
Figure 38 shows the interrupt timing that occurs when a RETI sequence is pending.
PS011804-0612
DC Characteristics