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ST10F269 Datasheet, PDF (147/160 Pages) STMicroelectronics – 16-BIT MCU WITH MAC UNIT, 256K BYTE FLASH MEMORY AND 12K BYTE RAM
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ST10F269
21.4.11 - Demultiplexed Bus
VDD = 5V ± 10%, VSS = 0V, TA = -40 to +125°C, CL = 50pF,
ALE cycle time = 4 TCL + 2tA + tC + tF (50ns at 40MHz CPU clock without wait states).
Table 36 : Demultiplexed Bus Characteristics
Symbol
Parameter
Maximum CPU Clock
= 40MHz
Minimum Maximum
Variable CPU Clock
1/2 TCL = 1 to 40MHz
Minimum
Maximum
t5 CC ALE high time
4 + tA
–
TCL - 8.5 + tA
–
ns
t6 CC Address setup to ALE
2 + tA
–
TCL - 10.5 + tA
–
ns
t80 CC Address/Unlatched CS setup to 16.5 + 2tA
–
2 TCL - 8.5 + 2tA
–
ns
RD, WR
(with RW-delay)
t81 CC Address/Unlatched CS setup to 4 + 2tA
–
TCL - 8.5 + 2tA
–
ns
RD, WR
(no RW-delay)
t12 CC RD, WR low time
(with RW-delay)
15.5 + tC
–
2 TCL - 9.5 + tC
–
ns
t13 CC RD, WR low time
(no RW-delay)
28 + tC
–
3 TCL - 9.5 + tC
–
ns
t14 SR RD to valid data in
(with RW-delay)
–
6 + tC
–
2 TCL - 19 + tC ns
t15 SR RD to valid data in
(no RW-delay)
–
18.5 + tC
–
3 TCL - 19 + tC ns
t16 SR ALE low to valid data in
–
18.5 + tA +
–
tC
3 TCL - 19
ns
+ tA + tC
t17 SR Address/Unlatched CS to valid
–
22 + 2tA +
–
data in
tC
4 TCL - 28
ns
+ 2tA + tC
t18 SR Data hold after RD
rising edge
0
–
0
–
ns
t20 SR Data float after RD rising edge
–
16.5 + tF
–
(with RW-delay)
13
2 TCL - 8.5
ns
+ tF + 2tA 1
t21 SR Data float after RD rising edge
–
(no RW-delay)
13
4 + tF
–
TCL - 8.5
ns
+ tF + 2tA 1
t22 CC Data valid to WR
10 + tC
–
2 TCL - 15 + tC
–
ns
t24 CC Data hold after WR
4 + tF
–
TCL - 8.5 + tF
–
ns
t26 CC ALE rising edge after RD, WR
-10 + tF
–
-10 + tF
–
ns
t28 CC Address/Unlatched CS hold
0 (no tF)
–
after RD, WR
2
-5 + tF
(tF > 0)
0 (no tF)
-5 + tF
(tF > 0)
–
ns
t28h CC Address/Unlatched CS hold
-5 + tF
–
after WRH
-5 + tF
–
ns
t38 CC ALE falling edge to Latched CS
-4 - tA
6 - tA
-4 - tA
6 - tA
ns
t39 SR Latched CS low to Valid Data In
–
18.5
–
+ tC + 2tA
3 TCL - 19
ns
+ tC + 2tA
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