AT89S8253_09 Datasheet, PDF (51/60 Pages) ATMEL Corporation – 8-bit Microcontroller with 12K Bytes Flash

AT89S8253
37. Serial Port Timing: Shift Register Mode Test Conditions
The values in this table are valid for V_CC = 2.7V to 5.5V and Load Capacitance = 80 pF.
Variable Oscillator
Symbol Parameter
Min
Max
t_XLXL
t_QVXH
t_XHQX
t_XHDX
t_XHDV
Serial Port Clock Cycle Time
Output Data Setup to Clock Rising Edge
Output Data Hold after Clock Rising Edge
Input Data Hold after Clock Rising Edge
Input Data Valid to Clock Rising Edge
12t_CLCL -15
10t_CLCL -15
2t_CLCL -15
t_CLCL
0
38. Shift Register Mode Timing Waveforms
Units
µs
ns
ns
ns
ns
39. AC Testing Input/Output Waveforms⁽¹⁾
Note: 1. AC Inputs during testing are driven at V_CC - 0.5V for a logic 1 and 0.45V for a logic 0. Timing measurements are made at V_IH
min. for a logic 1 and V_IL max. for a logic 0.
40. Float Waveforms⁽¹⁾
Note: 1. For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs. A port pin begins to
float when a 100 mV change from the loaded V_OH/V_OL level occurs.
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3286M–MICRO–10/09