7733 datasheet(678/940 Pages) RENESAS

Part #	7733

Description	16-BIT SINGLE-CHIP MICROCOMPUTER

PDF	940 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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CONNECTING EXTERNAL DEVICES

7735 Group User’s Manual

12–2

Functions for connecting external devices are described in this chapter.

Reading or writing data from or to external devices are performed by the bus interface unit (BIU). (Refer to

section “2.2 Bus interface unit.”) The BIU operates on the basis of internal enable signal E (usually,

internal clock

φ divided by 2) but does not output internal enable signal E to the external. The BIU outputs

____

signals RDE, WEL, and WEH.

____

Signals RDE, WEL, and WEH are generated from internal enable signal E and are output at the same timing

as that of internal enable signal E. When external devices are accessed, the BIU outputs some of these

signals, in other words, outputs only signals which are required for the access at that time.

12.1 Signals required for accessing external devices

7733 Datasheet(PDF) 678 Page - Renesas Technology Corp