HD6432351 datasheet(99/1025 Pages) RENESAS

Teilenummer	HD6432351

Bauteilbeschribung	16-Bit Single-Chip Microcomputer

PDF	1025 Pages

Scroll/Zoom	100%

Hersteller	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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99 / 1025 page

Section 2 CPU

Rev. 3.00 Sep 15, 2006 page 65 of 988

REJ09B0330-0300

2.9

Basic Timing

2.9.1

Overview

The CPU is driven by a system clock, denoted by the symbol

φ. The period from one rising edge

φ to the next is referred to as a “state.” The memory cycle or bus cycle consists of one, two, or

three states. Different methods are used to access on-chip memory, on-chip supporting modules,

and the external address space.

2.9.2

On-Chip Memory (ROM, RAM)

On-chip memory is accessed in one state. The data bus is 16 bits wide, permitting both byte and

word transfer instruction. Figure 2.17 shows the on-chip memory access cycle. Figure 2.18 shows

the pin states.

Internal address bus

Internal read signal

Internal data bus

Internal write signal

Internal data bus

Bus cycle

Address

Read data

Write data

Read

access

Write

access

Figure 2.17 On-Chip Memory Access Cycle

HD6432351 Datenblatt(PDF) 99 Page - Renesas Technology Corp