AUTOMOTIVE MICROCONTROLLER MCS 51
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SHIFT REGISTER TIMING WAVEFORMS
270499–10
EXTERNAL CLOCK DRIVE
Symbol
1/T
Parameter
Oscillator Frequency
High Time
Min
3.5
20
Max
Units
MHz
ns
12
CLCL
T
T
T
T
CHCX
Low Time
20
ns
CLCX
CLCH
CHCL
Rise Time
20
20
ns
Fall Time
ns
EXTERNAL CLOCK DRIVE WAVEFORMS
270499–11
AC TESTING INPUT, OUTPUT WAVEFORMS
270499–12
AC Testing: Inputs are driven at 2.4V for a Logic ‘‘1’’ and 0.45V
for a Logic ‘‘0’’. Timing measurements are made at 2.0V for a
Logic ‘‘1’’ and 0.8V for a Logic ‘‘0’’.
10