Instruction Fetch From External Memory - NEC PD78052 User Manual

CHAPTER 22 EXTERNAL DEVICE EXPANSION FUNCTION
Figure 22-4. Instruction Fetch from External Memory
(a) No wait (PW1, PW0 = 0, 0) setting
ASTB
RD
AD0-AD7
Lower Address Operation Code
A8-A15
Higher Address
(b) Wait (PW1, PW0 = 0, 1) setting
ASTB
RD
AD0-AD7
Lower Address Operation Code
A8-A15
Higher Address
Internal Wait Signal
(1-clock wait)
(c) External wait (PW1, PW0 = 1, 1) setting
ASTB
RD
AD0-AD7 Lower Address Operation Code
A8-A15 Higher Address
WAIT
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