UPD784031 Datasheet, PDF (64/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD784031
(1) Read/write operation (2/2)
Parameter
Data setup time (to WR↑)
Symbol
Conditions
tSODW
VDD = +5.0 V ± 10 %
Data hold time (to WR↑)^Note tHWOD
VDD = +5.0 V ± 10 %
Delay from WR↑ to ASTB↑
WR low-level width
tDWST
tWWL
VDD = +5.0 V ± 10 %
MIN.
MAX.
Unit
(1.5 + n) T - 30
ns
(1.5 + n) T - 40
ns
0.5T - 5
ns
0.5T - 25
ns
0.5T - 12
ns
(1.5 + n) T - 30
ns
(1.5 + n) T - 40
ns
Note The hold time includes the time during which VOH1 and VOL1 are held under the load conditions of
CL = 50 pF and RL = 4.7 kΩ.
Remarks T: TCYK (system clock cycle time)
n: Number of wait states (n ≥ 0)
(2) Bus hold timing
Parameter
Symbol
Conditions
Delay from HLDRQ↑ to float tFHQC
Delay from HLDRQ↑ to HLDAK↑ tDHQHHAH VDD = +5.0 V ± 10 %
Delay from float to HLDAK↑ tDCFHA
Delay from HLDRQ↓ to HLDAK↓ tDHQLHAL
VDD = +5.0 V ± 10 %
Delay from HLDAK↓ to active tDHAC
VDD = +5.0 V ± 10 %
MIN.
1T - 20
1T - 30
MAX.
Unit
(6 + a + n) T + 50 ns
(7 + a + n) T + 30 ns
(7 + a + n) T + 40 ns
1T + 30
ns
2T + 40
ns
2T + 60
ns
ns
ns
Remarks T:
a:
n:
TCYK (system clock cycle time)
1 (during address wait), otherwise, 0
Number of wait states (n ≥ 0)
64