ASTB
RD
AD0-AD7
A8-A15
ASTB
RD
AD0-AD7
A8-A15
Internal Wait Signal
(1-clock wait)
ASTB
RD
AD0-AD7
A8-A15
WAIT
520
CHAPTER 22 EXTERNAL DEVICE EXPANSION FUNCTION
Figure 22-5. External Memory Read Timing
(a) No wait (PW1, PW0 = 0, 0) setting
Lower Address
(b) Wait (PW1, PW0 = 0, 1) setting
Lower Address
(c) External wait (PW1, PW0 = 1, 1) setting
Lower Address
Read Data
Higher Address
Read Data
Higher Address
Read Data
Higher Address