参数资料
型号: ST10F168-Q2
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP144
封装: 28 X 28 MM, PLASTIC, QFP-144
文件页数: 55/76页
文件大小: 483K
代理商: ST10F168-Q2
ST10F168
59/76
20.5.9 - Memory Cycle Variables
The tables below use three variables which are derived from the BUSCONx registers and which
represent the special characteristics of the programmed memory cycle. The following table describes
how these variables are computed.
20.5.10 - Multiplexed Bus
VDD =5V ±10%, VSS = 0V, for Q6 version : TA = -40, +85°C and for Q2 version TA = -40, +125°C, CL = 100pF,
ALE cycle time = 6 TCL + 2tA +tC +tF (120ns at 25MHz CPU clock without wait states),
unless otherwise specified.
Symbol
Description
Values
tA
ALE Extension
TCL x <ALECTL>
tC
Memory Cycle Time wait states
2TCL x (15 - <MCTC>)
tF
Memory Tristate Time
2TCL x (1 - <MTTC>)
Table 24 : Multiplexed bus characteristics
Symbol
Parameter
Max. CPU Clock
25MHz
Variable CPU Clock
1/2 TCL = 1 to 25MHz
Unit
Min.
Max.
Min.
Max.
t5
CC ALE high time
10 + tA
–TCL - 10 + tA
–ns
t6
CC Address setup to ALE
4 + tA
TCL - 16+ tA
–ns
t7
CC Address hold after ALE
10 + tA
–TCL - 10 + tA
–ns
t8
CC ALE falling edge to RD, WR
(with RW-delay)
10 + tA
–TCL - 10 + tA
–ns
t9
CC ALE falling edge to RD, WR
(no RW-delay)
-10 + tA
-10 + tA
–ns
t10 CC Address float after RD, WR 1
(with RW-delay)
–6
6
ns
t11 CC Address float after RD, WR 1
(no RW-delay)
26
TCL + 6
ns
t12 CC RD, WR low time (with RW-delay)
30 + tC
2TCL - 10 + tC
–ns
t13 CC RD, WR low time (no RW-delay)
50 + tC
3TCL - 10 + tC
–ns
t14 SR RD to valid data in (with RW-delay)
20 + tC
2TCL - 20+ tC
ns
t15 SR RD to valid data in (no RW-delay)
40 + tC
3TCL - 20+ tC
ns
t16 SR ALE low to valid data in
40 + tA +tC
3TCL - 20
+tA +tC
ns
t17 SR Address / Unlatched CS to valid data in
50 + 2tA +tC
4TCL - 30
+2tA +tC
ns
t18 SR Data hold after RD rising edge
0
0
ns
t19 SR Data float after RD 1
–26 + tF
2TCL - 14 + tF
ns
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