M30620ECFS datasheet(523/621 Pages) RENESAS

No. de pieza	M30620ECFS

Descripción Electrónicos	16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY

PDF	621 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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External Buses

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

508

5.1 Overview of External Buses

Memory and I/O external expansion can be attained in either the memory expansion mode or the micro-

processor mode. When accessing an external area in either mode, 8-bit data bus width or 16-bit data bus

width can be selected, based on the BYTE pin level. 16-bit width is used to access an internal area,

regardless of the level of the BYTE pin.

Fix the BYTE pin either to “H” or “L” level. 8-bit and 16-bit data bus widths cannot be used together in an

external area.

Addresses (A0 through A19) for accessing a memory space of up to 1M bytes, as well as chip selects

_______

(CS0 through CS3) which indicate areas resulting from dividing a 1M bytes space into four, can be output

in both the memory expansion mode and microprocessor mode.

Table 5.1.1. Memory space expansion mode and memory spaces

Expansion mode

Normal mode

Expansion mode 1

Expansion mode 2

Accesible memory space

Up to 1M byte

Up to 1.2M byte

Up to 4M byte

M30620ECFS Datasheet(PDF) 523 Page - Renesas Technology Corp