M16CSLASH62 datasheet(532/621 Pages) RENESAS

532 / 621 page

External Buses

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

517

(1)4-Mbyte ROM and 128-Kbyte SRAM Connection Example

Figure 5.3.6 shows how to connect 4-Mbyte ROM and 128-Kbyte SRAM in microprocessor mode. Locate

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the 4-Mbyte ROM in the CS0 area that has been extended in memory space extension mode 2 and the

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128-Kbyte SRAM in the CS2 area.

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Connect CS0 to the 4-Mbyte ROM’s chip enable pin and CS1, CS2, and CS to the address pins A19, A20,

and A21, respectively. Connect the M16C’s A19 to the 4-Mbyte ROM’s A18, leaving the M16C’s A18

unused.

In the above diagram, an SRAM with two chip select signal inputs is used. When using memory with only

one chip select signal input, you need to have an external circuit to decode the address.

Addresses in 4-Mbyte ROM with regard to M16C settings are shown in Table 5.3.1.

Figure 5.3.6. 4-Mbyte ROM and 128-Kbyte SRAM Connection Example

CNVss

BYTE

M16C/62

A0 to A19

CS0

CS1

CS2

CS3

D0 to D7

CS3

CS2

CS1

A19

A17 to A0

4M bytes ROM

A21

A20

A19

A18

A17 to A0

DQ0 D0

CS0

128K bytes SRAM

DQ1

A16

CS2

CS0

A16

DQ8

DQ7

M16C/62 Datasheet(PDF) 532 Page - Renesas Technology Corp

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