NEC 78014Y Series User Manual page 478

CHAPTER 19 EXTERNAL DEVICE EXPANSION FUNCTION
Figure 19-3. Instruction Fetch from External Memory
(a) When without Wait (PW1, PW0 = 0, 0) Setup
ASTB
RD
Low-order
AD0 to AD7
Instruction code
address
A8 to A15 High-order address
(b) When with Wait (PW1, PW0 = 0, 1) Setup
ASTB
RD
Low-order
AD0 to AD7 Instruction code
address
High-order address
A8 to A15
Internal wait signal
(1-clock wait)
(c) When External Wait (PW1, PW0 = 1, 1) Setup
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ASTB
RD
Low-order
AD0 to AD7 Instruction code
address
A8 to A15
High-order address
WAIT
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