7733 datasheet(410/940 Pages) RENESAS

410 / 940 page

APPLICATIONS

7733 Group User’s Manual

17–3

Table 17.1.1 Memory expansion models

g For functions and operations of pins used in memory expansion, refer to chapter “12. CONNECTING

EXTERNAL DEVICES.”

For timing characteristics, refer to chapter“15. ELECTRICAL CHARACTERISTICS.”

g In memory expansion, the address bus can be expanded up to 24 bits wide. Accordingly, be sure to

strengthen the 7733 Group’s Vss line on the system. (Refer t

o section “Appendix 8.Countermeasure

examples against noise.”)

Accessible area

Memory expansion model

64 Kbytes (Max.)

16 Mbytes (Max.)

External data

bus

BYTE

7733 Group

BYTE

7733 Group

BYTE

7733 Group

8 bits wide

BYTE = “H”

16 bits wide

BYTE = “L”

Minimum model

Medium model A

Maximum model

Memory expansion model

Medium model B

Memory expansion model

A0 to A15

D0 to D7

A0 to A15

Latch

D0 to D15

A0 to A15+n

D0 to D7

16+n

Latch

A0 to A15+n

D0 to D15

16+n

ALE

BHE

7733 Group

ALE

BHE

17.1 Memory expansion

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