NEC uPD78P078 - Manual (Page 535)

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