H8SX1663 datasheet(231/1158 Pages) RENESAS

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Section 6 Bus Controller (BSC)

Rev.1.00 Jun. 07, 2006 Page 179 of 1102

REJ09B0294-0100

Output waveform

Area 5 access

CS6

CS5

Area 6 access

Area 5 access

Area 6 access

Address bus

Figure 6.10 Timing When

CS Signal is Output to the Same Pin

6.5.4

External Bus Interface

The type of the external bus interfaces, bus width, endian format, number of access cycles, and

strobe assert/negate timings can be set for each area in the external address space. The bus width

and the number of access cycles for both on-chip memory and internal I/O registers are fixed, and

are not affected by the external bus settings.

(1) Type of External Bus Interface

Four types of external bus interfaces are provided and can be selected in area units. Table 6.4

shows each interface name, description, area name to be set for each interface. Table 6.5 shows the

areas that can be specified for each interface. The initial state of each area is a basic bus interface.

Table 6.4

Interface Names and Area Names

Interface

Description

Area Name

Basic interface

Directly connected to ROM and

RAM

Basic bus space

Byte control SRAM interface

Directly connected to byte

SRAM with byte control pin

Byte control SRAM space

Burst ROM interface

Directly connected to the ROM

that allows page access

Burst ROM space

Address/data multiplexed I/O

interface

Directly connected to the

peripheral LSI that requires

address and data multiplexing

Address/data multiplexed I/O

space

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