7733 datasheet(689/940 Pages) RENESAS

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CONNECTING EXTERNAL DEVICES

7735 Group User’s Manual

12–13

Data (even)

Data (odd)

Address

RDE

ALE

CS0 to CS4

A16, A17

WEH

WEL

“H”

Address

A0/D0 to

A7/D7

A8/D8 to

A15/D15

Address

(Note 3)

RDE

ALE

CS0 to CS4

A16, A17

WEH

WEL

“H”

Address

(Note 3)

Address

A0/D0 to

A7/D7

A8/D8 to

A15/D15

Address

RDE

ALE

CS0 to CS4

A16, A17

WEH

WEL

“H”

Address

(Note 2)

Address

A0/D0 to

A7/D7

A8/D8 to

A15/D15

“H”

(Note 1)

(Note 2)

(Note 1)

RDE

(a) Read starting from even address

ALE

CS0 to CS4

A0/D0 to

A7/D7

A16, A17

Address

A8/D8 to

A15/D15

Address

WEH

WEL

“H”

Address

(Note 1)

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

fetched into the data buffer of the BIU.

3: Invalid data (Undefined value)

“H”

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

<16-bit data access>

(b) Write starting from even address

(d) Write starting from odd address

(Note 1)

Data (even)

Data (odd)

Fig. 12.1.7 Operating waveform example of signals which are input to or output from the external (1)

12.1 Signals required for accessing external devices

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