External Memory Read Modify Write Timing In Multiplexed Bus Mode - NEC PD78076 User Manual

CHAPTER 23 EXTERNAL DEVICE EXPANSION FUNCTION
Figure 23-8. External Memory Read Modify Write Timing in Multiplexed Bus Mode
(a) No wait (PW1, PW0 = 0, 0) setting
ASTB
RD
WR
Hi-Z
AD0 to AD7 Lower Address Read Data Write Data
A8 to A15 Higher Address
(b) Wait (PW1, PW0 = 0, 1) setting
ASTB
RD
WR
Hi-Z
Read Data Write Data
Lower Address
AD0 to AD7
Higher Address
A8 to A15
Internal Wait Signal
(1-clock wait)
(c) External wait (PW1, PW0 = 1, 1) setting
ASTB
RD
WR
Hi-Z
AD0 to AD7 Read Data Write Data
Lower Address
Higher Address
A8 to A15
WAIT
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