H8SLASH3028F datasheet(599/923 Pages) RENESAS

Part #	H8/3028F

Description	Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

PDF	923 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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599 / 923 page

Rev. 2.00, 09/03, page 569 of 890

Section 17 RAM

17.1

Overview

The H8/3028 Group has 16 kbytes RAM. The RAM is connected to the CPU by a 16-bit data bus.

The CPU accesses both byte data and word data in two states, making the RAM useful for rapid

data transfer.

The on-chip RAM of the H8/3028 Group is assigned to addresses H'FBF20 to H'FFF1F in modes

1, 2, and 7, and to addresses H'FFBF20 to H'FFFF1F in modes 3, 4, and 5,and to addresses H'E720

to H'FF1F in mode 6. The RAM enable bit (RAME) in the system control register (SYSCR) can

enable or disable the on-chip RAM.

17.1.1

Block Diagram

Figure 17.1 shows a block diagram of the on-chip RAM.

H'FBF20*

H'FBF22*

H'FFF1E*

H'FBF21*

H'FBF23*

H'FFF1F*

On-chip data bus (upper 8 bits)

On-chip data bus (lower 8 bits)

Bus interface

SYSCR

On-chip RAM

Even addresses

Odd addresses

Legend

SYSCR: System control register

Note: * Lower 20 bits of the address in mode 7.

Figure 17.1 RAM Block Diagram

H8/3028F Datasheet(PDF) 599 Page - Renesas Technology Corp