M16CSLASH62 datasheet(534/621 Pages) RENESAS

534 / 621 page

External Buses

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

519

(2)2-Mbyte ROM and 256-Kbyte SRAM Connection Example

Figure 5.3.8 shows how to connect 2-Mbyte ROM and 256-Kbyte SRAM in microprocessor mode. Locate

both the 2-Mbyte ROM and 256-Kbyte SRAM in the CS0 area that has been extended in memory space

extension mode 2.

Specifically, locate the 2-Mbyte ROM in the area comprised of banks 4 though 7 and the 256-Kbyte

SRAM in the area of bank 0.

_______

Enter the signal decoded from outputs CS0 and CS3 to the 2-Mbyte ROM’s chip enable pin. Connect CS1

_______

and CS2 to the address pins A19 and A20. Connect the M16C’s A19 to the 2-Mbyte ROM’s A18, leaving

the M16C’s A18 unused.

_______

Enter the signal decoded from outputs CS0 and CS3 to the 256-Kbyte SRAM’s chip enable pin.

Access areas in 2-Mbyte ROM and 256-Kbyte SRAM with regard to M16C settings are shown in Table

5.3.2.

Figure 5.3.8. 2-Mbyte ROM and 256-Kbyte SRAM Connection Example

CNVss

BYTE

M16C/62

A0 to A19

CS0

CS1

CS2

CS3

D0 to D7

CS0

CS3

CS2

CS1

A19

A17 to A0

2M bytes ROM

A20

A19

A18

A17 to A0

DQ0

DQ7

DQ1

DQ8

A16

CS3

CS0

256K bytes SRAM

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