Z8L180 ZILOG [Zilog, Inc.], Z8L180 Datasheet - Page 102
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Z8L180
Manufacturer Part Number
Z8L180
Description
Z8018x Family MPU
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.Z8L180.pdf
(326 pages)
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Z 8018x Fam il y
M PU Us e r M anual
87
Refresh cycles may be programmed to be either two or three clock cycles
in duration by programming the REFW (Refresh Wait) bit in the Refresh
Control Register (RCR). The external WAIT input and the internal Wait
State generator are not effective during refresh.
Figure 44 depicts the timing of a refresh cycle with a refresh wait (TRW)
cycle.
MCi
Refresh cycle
MCi+1
TR1
TRW* TR2
Refresh signal
(Internal signal)
Refresh address
A0 — A7
MREQ
RFSH
NOTE: * If three refresh cycles are specified, TRW is inserted.
Otherwise, TRW is not inserted
MC: Machine Cycle
Figure 44.
Refresh Cycle Timing Diagram
UM005001-ZMP0400
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