NEC uPD78056Y User Manual

Page 519

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519

CHAPTER 22 EXTERNAL DEVICE EXPANSION FUNCTION

Figure 22-4. Instruction Fetch from External Memory

(a) No wait (PW1, PW0 = 0, 0) setting

(b) Wait (PW1, PW0 = 0, 1) setting

(c) External wait (PW1, PW0 = 1, 1) setting

ASTB

RD

Lower Address

Operation Code

AD0-AD7

A8-A15

Higher Address

WAIT

ASTB

RD

AD0-AD7

A8-A15

Lower Address

Operation Code

Higher Address

Internal Wait Signal

(1-clock wait)

ASTB

RD

AD0-AD7

A8-A15

Lower Address

Operation Code

Higher Address

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This manual is related to the following products:

PD78056Y, PD78055Y, PD78058, PD78052Y, PD78P058Y, PD78P054, PD78054Y, uPD78054Y, PD78056, PD78058Y, uPD78058Y, uPD78052, uPD78055Y, PD78053Y, uPD78052Y, uPD78054, uPD78P058, uPD78053, PD78052(A), uPD78053Y, uPD78056, PD78055, uPD78058, uPD78P054, PD78052, PD78053(A), PD78053, PD78054(A)

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