UPD78320 Datasheet, PDF (68/88 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78320, 78322
AC CHARACTERISTICS (TA = –10 to +70 °C, VDD = +5 V ±10 %, VSS = 0 V)
Non-consecutive read/write operation (with general-purpose memory connected)
Parameter
System clock cycle time
Address setup time (vs. ASTB↓)
Address hold time (vs. ASTB↓)
RD↓ delay time from address
Address float time from RD↓
Data input time from address
Data input time from RD↓
RD↓ delay time from ASTB↓
Data hold time (vs. RD↑)
Address active time from RD↑
RD low-level width
ASTB high-level width
WR↓ delay time from address
Data output time from ASTB↓
Data output time from WR↓
WR↓ delay time from ASTB↓
Data setup time (vs. WR↑)
Data hold time (vs. WR↑)
ASTB↑ delay time from WR↑
WR low-level width
Symbol
tCYK
tSAST
tHSTA
tDAR
tFRA
tDAID
tDRID
tDSTR
tHRID
tDRA
tWRL
tWSTH
tDAW
tDSTOD
tDWOD
tDSTW
tSODW
tHWOD
tDWST
tWWL
Test Conditions
MIN.
MAX.
Unit
125
250
ns
32
ns
32
ns
85
ns
0
ns
222
ns
112
ns
42
ns
0
ns
50
ns
157
ns
37
ns
85
ns
102
ns
40
ns
42
ns
147
ns
32
ns
42
ns
157
ns
68