C515 Datasheet, PDF (54/55 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C515
V_CC -0.5 V
0.2 V_CC+0.9
Test Points
0.45 V
0.2 V_CC -0.1
MCT00039
AC Inputs during testing are driven at V_CC - 0.5 V for a logic ’1’ and 0.45 V for a logic ’0’.
Timing measurements are made at V_IHmin for a logic ’1’ and V_ILmax for a logic ’0’.
Figure 26
AC Testing: Input, Output Waveforms
V_Load
V_Load +0.1 V
Timing Reference
Points
V_OH ^{-0.1 V}
V_Load ^{-0.1 V}
V_OL +0.1 V
MCT00038
For timing purposes a port pin is no longer floating when a 100 mV
change from load voltage occurs and begins to float when a 100 mV change from the loaded
V_OH/V_OL level occurs.
Figure 27
AC Testing : Float Waveforms
Crystal Oscillator Mode
C
1-24 MHz
C
XTAL1
XTAL2
Driving from External Source
N.C.
XTAL1
External Oscillator
Signal
XTAL2
Crystal Mode : C = 20 pF±10 pF (incl. stray capacitance)
MCS03204
Figure 28
Recommended Oscillator Circuits for Crystal Oscillator
Semiconductor Group
54
1997-08-01