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H8SX1663 Fiches technique(PDF) 349 Page - Renesas Technology Corp

No de pièce H8SX1663
Description  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1158 Pages
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Fabricant  RENESAS [Renesas Technology Corp]
Site Internet  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8SX1663 Fiches technique(HTML) 349 Page - Renesas Technology Corp

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Section 6 Bus Controller (BSC)
Rev.1.00 Jun. 07, 2006 Page 297 of 1102
REJ09B0294-0100
(5) External NOP Cycles and Idle Cycles
A cycle in which an external space is not accessed due to internal operations is called an external
NOP cycle. Even when an external NOP cycle occurs between consecutive external bus cycles, an
idle cycle can be inserted. In this case, the number of external NOP cycles is included in the
number of idle cycles to be inserted.
Figure 6.94 shows an example of external NOP and idle cycle insertion.
T
1
T
2
T
3
T
pw
T
1
T
2
T
3
T
pw
T
i
T
i
Address bus
No external access
(NOP)
Specified number of idle cycles or more
including no external access cycles (NOP)
Idle cycle
(remaining)
Following bus cycle
Preceding bus cycle
(Condition: Number of idle cycles to be inserted when different reads continue: 4 cycles)
Data bus
B
φ
CS (area B)
CS (area A)
RD
Figure 6.94 Idle Cycle Insertion Example



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