DS80C310

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EXTERNAL CLOCK CHARACTERISTICS

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Clock High Time

10

ns

Clock Low Time

10

ns

Clock Rise Time

5

ns

Clock Fall Time

5

ns

SERIAL PORT MODE 0 TIMING CHARACTERISTICS

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Serial Port Clock Cycle Time

SM2=0, 12 clocks per cycle

SM2=1, 4 clocks per cycle

ns

ns

Output Data Setup to Clock

Rising

SM2=0, 12 clocks per cycle

SM2=1, 4 clocks per cycle

ns

ns

Output Data Hold from

Clock Rising

SM2=0, 12 clocks per cycle

SM2=1, 4 clocks per cycle

ns

ns

Input Data Hold after Clock

Rising

SM2=0, 12 clocks per cycle

SM2=1, 4 clocks per cycle

ns

ns

Clock Rising Edge to Input

Data Valid

SM2=0, 12 clocks per cycle

SM2=1, 4 clocks per cycle

ns

ns

EXPLANATION OF AC SYMBOLS

In an effort to remain compatible with the original 8051 family, this device specifies the same parameters

as such devices, using the same symbols. For completeness, the following is an explanation of the

symbols.

t

Time

A

Address

C

Clock

D

Input data

H

Logic level high

L

Logic level low

I

Instruction

P

PSEN

Q

Output data

R

RD

signal

V

Valid

W

WR

signal

X

No longer a valid logic level

Z

Tristate