NEC uPD78P078 User Manual
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535
CHAPTER 23 EXTERNAL DEVICE EXPANSION FUNCTION
Figure 23-5. Instruction Fetch from External Memory in Multiplexed Bus Mode
(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
AD0 to AD7
A8 to A15
Lower Address
Operation
Code
Higher Address
ASTB
RD
AD0 to AD7
A8 to A15
Lower Address
Operation Code
Higher Address
Internal Wait Signal
(1-clock wait)
ASTB
RD
Lower Address
Operation Code
AD0 to AD7
A8 to A15
Higher Address
WAIT