M38005S2-XXXSP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38005S2-XXXSP

8-BIT SINGLE-CHIP MICROCOMPUTER

MITSUBISHI ELECTRIC  

APPLICATION

2.4 Processor mode

2.4.3 Processor mode application examples

(1) Application example of memory expansion in the case where the ONW (One-Wait)

function is not used

Outline : The external memory is accessed in the microprocessor mode.

At f(XIN) = 8 MHz, an available RAM is given by the following :

• OE access time : ta (OE) ≤ 50 ns

• Setup time for writing data : tsu (D) ≤ 65 ns

For example, the M5M5256BP-10 whose address access is 100 ns is available.

Figure 2.4.3 shows an expansion example of a 32K byte ROM and a 32K byte RAM.

3800 group

CNVSS

AD15

ONW

M5M27C256AK-10 M5M5256BP-10

2 P30 , P31

CE

8 P4

AD14

AD0

74F04

15

A0–A14

EPROM

S

A0–A14

SRAM

8 P5

8 P6

2 P7

DB0

DB7

RD

WR

8

D0–D7

OE

8MHz VCC = 5.0V ± 10 %

DQ1–DQ8

OE W

Memory map

000016 External RAM area

(M5M5256BP)

000816 SFR area

004016 Internal RAM area

044016 External RAM area

(M5M5256BP)

800016

External ROM area

(M5M27C256AK)

FFFF16

Fig. 2.4.3 Expansion example of ROM and RAM

2-50

3800 GROUP USER’S MANUAL

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