DS87C550 datasheet(39/50 Pages) DALLAS

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DS87C550

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MOVX CHARACTERISTICS CONT’D

Data Hold

after Write

tWHQX

0.25tMCS-5

0.5tMCS-5

1.5tMCS-10

CST=0

1<=CST<=3

4<=CST<=7

Low to

Address Float

tRLAZ

-((0.125 tMCS)-5)

or WR High

to ALE High

tWHLH

0.25tMCS-5

1.25tMCS-10

0.25tMCS+5

1.25tMCS+10

CST=0

1<=CST<=3

4<=CST<=7

NOTES FOR MOVX CHARACTERISTICS USING STRETCH MEMORY

CYCLES

§ t

MCS is a time period related to the Stretch memory cycle selection. The following table shows the

value of tMCS for each Stretch selection.

§ C

ST is the stretch cycle value as determined by the MD2, MD1, & MD0 bits of the CKCON register.

tMCS TIME PERIODS

System Clock Selection

tMCS

4X/ 2X , CD1, CD0 = 100

0.5 tCLCL

4X/ 2X , CD1, CD0 = 000

1 tCLCL

4X/ 2X , CD1, CD0 = x10

4 tCLCL

4X/ 2X , CD1, CD0 = x11

1024 tCLCL

, WR PULSE WIDTH WITH STRETCH CYCLES

, WR Pulse Width (in oscillator clocks)

MD2

MD1

MD0

MOVX

Machine

Cycles

4X/ 2X =1

CD1:0=00

4X/ 2X =0

CD1:0=00

4X/ 2X =x

CD1:0=10

4X/ 2X =x

CD1:0=11

0.5 tCLCL

1 tCLCL

2 tCLCL

2048 tCLCL

tCLCL

2 tCLCL

4 tCLCL

4096 tCLCL

2 tCLCL

4 tCLCL

8 tCLCL

8192 tCLCL

3 tCLCL

6 tCLCL

12 tCLCL

12288 tCLCL

4 tCLCL

8 tCLCL

16 tCLCL

16384 tCLCL

5 tCLCL

10 tCLCL

20 tCLCL

20480 tCLCL

6 tCLCL

12 tCLCL

24 tCLCL

24576 tCLCL

7 tCLCL

14 tCLCL

28 tCLCL

28672 tCLCL

EXTERNAL CLOCK CHARACTERISTICS

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Clock High Time

tCHCX

Clock Low Time

tCLCX

Clock Rise Time

tCLCL

Clock Fall Time

tCHCL

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