7733 datasheet(690/940 Pages) RENESAS

690 / 940 page

CONNECTING EXTERNAL DEVICES

7735 Group User’s Manual

12–14

RDE

ALE

CS0 to CS4

A0/D0 to

A7/D7

A16, A17

Address

A8/D8 to

A15/D15

Address

WEH

WEL

“H”

Address

(Note 2)

(Note 1)

Address

(Note 3)

RDE

ALE

CS0 to CS4

A16, A17

WEH

WEL

“H”

Address

Data (even)

A0/D0 to

A7/D7

A8/D8 to

A15/D15

“H”

Address

(Note 3)

RDE

ALE

CS0 to CS4

A16, A17

WEH

WEL

“H”

Address

Data (odd)

A0/D0 to

A7/D7

A8/D8 to

A15/D15

“H”

RDE

ALE

CS0 to CS4

A0/D0 to

A7/D7

A16, A17

Address

A8/D8 to

A15/D15

Address

WEH

WEL

“H”

Address

(Note 1)

(Note 2)

(e) Read starting from even address

q When external data bus is 16 bits wide (BYTE = “L” )

<8-bit data access>

(f) Write starting from even address

(g) Read starting from odd address

(h) Write starting from odd address

Notes 1: These pins which function as the external bus enter the floating state. While these pins are

in the floating state, data on the data bus is fetched into the data buffer of the BIU.

2: These pins which function as the external bus enter the floating state. While these pins are

in the floating state, data on the data bus is not fetched into the data buffer of the BIU.

3: Invalid data (Undefined value)

Fig. 12.1.8 Operating waveform example of signals which are input to or output from the external (2)

12.1 Signals required for accessing external devices

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