3886 datasheet(276/380 Pages) RENESAS

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3886 Group User’s Manual

APPLICATION

2-159

2.14 Processor mode

(3)

External memory connection example at f(XIN) = 8 MHz or more

Outline: When the access time of an external memory is fast, it is possible to use at f(XIN) = 8 MHz

or more. The RAM which meets the following conditions can be used at f(XIN) = 9 MHz:

•OE access time: ta(OE)

≤ 35 ns

•Data set up time at write: tsu(D)

≤ 50 ns.

For example, the M5M5256BP-70, whose address access time is 70 ns, can be used.

Figure 2.14.8 shows the expansion example of 32-Kbytes ROM and RAM.

Fig. 2.14.8 Expansion example of 32-Kbytes ROM and RAM at f(XIN) = 8 MHz or more

3886 group

CNVSS

ONW

AD15

8P5

AD14

AD0

DB0

DB7

M5M27C256AK-85

M5M5256BP-70

A0 to A14

D0 to D7

A0 to A14

DQ1 to DQ8

9MHz

VCC = 5.0 V

±10 %

External RAM area

(M5M5256BP)

SFR area

Internal RAM area

External RAM area

(M5M5256BP)

External ROM area

(M5M27C256AK)

000016

800016

044016

004016

000816

FFFF16

Memory map

74F04

P30, P31

EPROM

SRAM

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