7733 datasheet(691/940 Pages) RENESAS

691 / 940 page

CONNECTING EXTERNAL DEVICES

7735 Group User’s Manual

12–15

Address

RDE

ALE

CS0 to CS4

A16, A17

WEH

WEL

“H”

A0/D0 to

A7/D7

A8 to A15

Address

Data (even)

Address

Data (odd)

Address

(i) Read starting from even or odd address

RDE

ALE

CS0 to CS4

A0/D0 to

A7/D7

A16, A17

Address

A8 to A15

Address

WEH

WEL

“H”

Address

(Note)

Address

RDE

ALE

CS0 to CS4

A16, A17

WEH

WEL

“H”

A0/D0 to

A7/D7

A8 to A15

Address

Data (odd)

Address

Data (even)

Address

q When external data bus is 8 bits wide (BYTE = “H” )

<8/16-bit data access>

g When 16-bit data is accessed, the low-order 8 bits of data

are accessed first, and then, the high-order 8 bits are accessed.

8-bit data access

16-bit data access

(j) Write starting from even address

(k) Write starting from odd address

8-bit data access

16-bit data access

8-bit data access

16-bit data access

Note: 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.

Fig. 12.1.9 Operating waveform example of signals which are input to or output from the external (3)

12.1 Signals required for accessing external devices

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