HD6432142 datasheet(203/1177 Pages) RENESAS

Il numero della parte	HD6432142

Spiegazioni elettronici	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

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Section 6 Bus Controller

Rev. 4.00 Sep 27, 2006 page 159 of 1130

REJ09B0327-0400

6.3.4

I/O Select Signal

In this LSI, an I/O select signal (

IOS) can be output, with the signal output going low when the

designated external space is accessed.

Figure 6.2 shows an example of

IOS signal output timing.

Address bus

IOS

Bus cycle

External address in IOS set range

Figure 6.2

IOS

IOS Signal Output Timing

Enabling or disabling of

IOS signal output is controlled by the setting of the IOSE bit in SYSCR.

In expanded mode, this pin operates as the

AS output pin after a reset, and therefore the IOSE bit

in SYSCR must be set to 1 in order to use this pin as the

IOS signal output. See section 8, I/O

Ports, for details.

The range of addresses for which the

IOS signal is output can be set with bits IOS1 and IOS0 in

BCR. The

IOS signal address ranges are shown in table 6.4.

Table 6.4

IOS

IOS Signal Output Range Settings

IOS1

IOS0

IOS

IOS Signal Output Range

H'(FF)F000 to H'(FF)F03F

H'(FF)F000 to H'(FF)F0FF

H'(FF)F000 to H'(FF)F3FF

H'(FF)F000 to H'(FF)FE4F*

(Initial value)

Note:

In the H8S/2148 and H8S/2147 F-ZTAT A-mask version, the address range is from

H'(FF)F000 to H'(FF)F7FF.

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