H8SX1663 datasheet(349/1158 Pages) RENESAS

Numer części	H8SX1663

Szczegółowy opis	Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

PDF	1158 Pages

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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.

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 6.94 Idle Cycle Insertion Example

H8SX1663 Arkusz danych(PDF) 349 Page - Renesas Technology Corp