DS87C550 Datasheet, PDF (40/50 Pages) Dallas Semiconductor – EPROM High-Speed Micro with A/D and PWM

SERIAL PORT MODE 0 TIMING CHARACTERISTICS
PARAMETER
SYMBOL MIN TYP
Serial Port Clock Cycle Time
SM2=0, 12 clocks per cycle
SM2=1, 4 clocks per cycle
Output Data Setup to Clock Rising
SM2=0, 12 clocks per cycle
SM2=1, 4 clocks per cycle
Output Data Hold from Clock Rising
SM2=0, 12 clocks per cycle
SM2=1, 4 clocks per cycle
Input Data Hold from Clock Rising
SM2=0, 12 clocks per cycle
SM2=1, 4 clocks per cycle
Clock Rising Edge to Input Data Valid
SM2=0, 12 clocks per cycle
SM2=1, 4 clocks per cycle
t_XLXL
t_QVXH
t_XHQX
t_XHDX
t_XHDV
12t_CLCL
4t_CLCL
12t_CLCL
4t_CLCL
12t_CLCL
4t_CLCL
12t_CLCL
4t_CLCL
12t_CLCL
4t_CLCL
DS87C550
MAX UNITS NOTES
ns
ns
ns
ns
ns
ns
ns
ns
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
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