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CHAPTER 18 EXTERNAL DEVICE EXPANSION FUNCTION
Preliminary User’s Manual U13420EJ2V0UM00
Figure 18-7. External Memory Read Modify Write Timing
(a) No wait (PW1, PW0 = 0, 0) setting
(b) Wait (PW1, PW0 = 0, 1) setting
(c) External wait (PW1, PW0 = 1, 1) setting
Read data
Write data
Higher address
Hi-Z
Lower
address
RD
ASTB
AD0 to AD7
A8 to A15
WR
RD
ASTB
AD0 to AD7
A8 to A15
Hi-Z
WR
Write data
Higher address
Internal wait signal
(1-clock wait)
Read data
Lower
address
WAIT
Hi-Z
RD
ASTB
AD0 to AD7
A8 to A15
WR
Write data
Higher address
Read data
Lower
address
Summary of Contents for mPD780065 Series
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