UPD784020 Datasheet, PDF (73/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCOMPUTER

mPD784020, 784021
Timing Waveform
(1) Read operation
ASTB
A8-A19
tWSTH
tSAST
tHSTLA
tDSTID
tDAID
AD0-AD7
RD
tDSTR
tDAR
tFRA
tDRID
tWRL
(2) Write operation
ASTB
A8-A19
tWSTH
tSAST
tHSTLA
tDSTOD
AD0-AD7
WR
tDSTW
tDAW
tDWOD
tDSODW
tWWL
tDRST
tHRA
tHRID
tDRA
tDWST
tHWA
tHWOD
73