UPD784031 Datasheet, PDF (73/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD784031
REFRESH TIMING WAVEFORM
(1) Random read/write cycle
tRC
ASTB
WR
RD
tRC
tRC
tRC
tRC
(2) When refresh memory is accessed for a read and write at the same time
ASTB
RD, WR
REFRQ
(3) Refresh after a read
tDSTRFQ
tWRFQL
ASTB
RD
REFRQ
(4) Refresh after a write
ASTB
WR
REFRQ
tDRFQST
tWRFQH
tDRRFQ
tDRFQST
tWRFQL
tDWRFQ
tDRFQST
tWRFQL
73