ST10F268 datasheet(57/74 Pages) STMICROELECTRONICS

57 / 74 page

ST10F168

57/74

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 Q3 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

ALE Extension

TCL x <ALECTL>

Memory Cycle Time wait states

2TCL x (15 - <MCTC>)

Memory Tristate Time

2TCL x (1 - <MTTC>)

Table 24 : Multiplexed bus characteristics

Symbol

Parameter

Maximum CPU Clock

25MHz

Variable CPU Clock

1/2 TCL = 1 to 25MHz

Unit

Minimum

Maximum

Minimum

Maximum

CC ALE high time

10 + tA

–

TCL - 10 + tA

–ns

CC Address setup to ALE

4 + tA

–

TCL - 16+ tA

–ns

CC Address hold after ALE

10 + tA

–

TCL - 10 + tA

–ns

CC ALE falling edge to RD, WR

(with RW-delay)

10 + tA

–

TCL - 10 + tA

–ns

CC ALE falling edge to RD, WR

(no RW-delay)

-10 + tA

–

-10 + tA

–ns

t10 CC Address float after RD, WR

(with RW-delay)

–6

–

t11 CC Address float after RD, WR

(no RW-delay)

–

TCL + 6

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

t15 SR RD to valid data in (no RW-delay)

–

40 + tC

–

3TCL - 20+ tC

t16 SR ALE low to valid data in

–

40 + tA + tC

–

3TCL - 20

+ tA + tC

t17 SR Address / Unlatched CS to valid

data in

–

50 + 2tA + tC

–

4TCL - 30

+ 2tA + tC

t18 SR Data hold after RD rising edge

–

t19 SR Data float after RD

–26 + tF

–

2TCL - 14 + tF

t22 CC Data valid to WR

20 + tC

–

2TCL - 20 + tC

–ns

ST10F268 数据表(PDF) 57 Page - STMicroelectronics

ST10F268 数据表(HTML) 57 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

数据表下载

链接网址

ST10F268 数据表(PDF) 57 Page - STMicroelectronics

ST10F268 数据表(HTML) 57 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

数据表 下载

链接网址

数据表下载