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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



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