UPD784218 Datasheet, PDF (76/92 Pages) NEC – 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS

Timing Waveforms
(1) Read operation
(CLK)
A0 to A7
(Output)
tCYK
Lower address
µPD784218, 784218Y
Lower address
A8 to A19
(Output)
AD0 to AD7
(Input/output)
ASTB
(Output)
RD
(Output)
WAIT
(Input)
Hi-Z
Higher address
tDAID
tDSTID
Lower address
Hi-Z
(Output)
tSAST
tHSTLA
tFRA
Data (Input)
tHRID
tWSTH
tDSTR
tDAR
tDAWT
tDRWTL
tDRID
tWRL
tDRWTH
tHRWT
tDWTR
tDWTID
Higher address
tHRA
tDRA
Hi-Z
Lower address
(Output)
tDRST
tDSTWT
tDSTWTH
tHSTWT
Remark Signals are output from A0 to A7 while ports 80 to 87 are not being used.
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Data Sheet U12304EJ2V0DS00