13
0368G–MICRO–6/05
AT89C2051
18. External Clock Drive Waveforms
()
19. External Clock Drive
Symbol
Parameter
V
CC
= 2.7V to 6.0V
V
CC
= 4.0V to 6.0V
Units
Min
Max
Min
Max
1/t
CLCL
Oscillator Frequency
0
12
0
24
MHz
t
CLCL
Clock Period
83.3
41.6
ns
t
CHCX
High Time
30
15
ns
t
CLCX
Low Time
30
15
ns
t
CLCH
Rise Time
20
20
ns
t
CHCL
Fall Time
20
20
ns
20. Serial Port Timing: Shift Register Mode Test Conditions
V
CC
= 5.0V
±
20%; Load Capacitance = 80 pF
Symbol
Parameter
12 MHz Osc
Variable Oscillator
Units
Min
Max
Min
Max
t
XLXL
Serial Port Clock Cycle Time
1.0
12 t
CLCL
µs
t
QVXH
Output Data Setup to Clock Rising Edge
700
10 t
CLCL
-133
ns
t
XHQX
Output Data Hold after Clock Rising Edge
50
2 t
CLCL
-117
ns
t
XHDX
Input Data Hold after Clock Rising Edge
0
0
ns
t
XHDV
Clock Rising Edge to Input Data Valid
700
10 t
CLCL
-133
ns
Summary of Contents for AT89C2051
Page 19: ...19 0368G MICRO 6 05 AT89C2051...
