
142
T89C51CC01
Rev. D – 17-Dec-01
Table 103. AC Parameters for a Variable Clock
19.4.8 Shift Register Timing
Waveforms
19.4.9 External Clock Drive
Characteristics (XTAL1)
Table 104. AC Parameters
19.4.10 External Clock Drive
Waveforms
Symbol Type
Standard
Clock X2 Clock
X parameter
for -M range Units
T
XLXL
Min 12T 6T ns
T
QVHX
Min 10T-x 5T-x 50 ns
T
XHQX
Min 2 T - x T - x 20 ns
T
XHDX
Min x x 0 ns
T
XHDV
Max 10 T - x 5 T- x 133 ns
VALID VALID VALID VALID
VALID
VALID
INPUT DATA
VALID
0123456 87
ALE
CLOCK
OUTPUT DATA
WRITE to SBUF
CLEAR RI
T
XLXL
T
QVXH
T
XHQX
T
XHDV
T
XHDX
SET TI
SET RI
INSTRUCTION
01234567
VALID
Symbol Parameter Min Max Units
T
CLCL
Oscillator Period 25 ns
T
CHCX
High Time 5 ns
T
CLCX
Low Time 5 ns
T
CLCH
Rise Time 5 ns
T
CHCL
Fall Time 5 ns
T
CHCX
/T
CLCX
CyclicratioinX2mode 40 60 %
V
CC
-0.5V
0.45V
0.7V
CC
0.2V
CC
-0.1
T
CHCL
T
CLCX
T
CLCL
T
CLCH
T
CHCX
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