H8SXSLASH1663R datasheet(385/1504 Pages) RENESAS

Teilenummer	H8SX/1663R

Bauteilbeschribung	Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

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Section 9 Bus Controller (BSC)

Rev. 2.00 Sep. 24, 2008 Page 353 of 1468

REJ09B0412-0200

(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 9.97 shows an example of external NOP and idle cycle insertion.

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

CS (area B)

CS (area A)

Figure 9.97 Idle Cycle Insertion Example

H8SX/1663R Datenblatt(PDF) 385 Page - Renesas Technology Corp