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80C32E_07 Datasheet, PDF (15/20 Pages) ATMEL Corporation – Rad. Tolerant 8-bit ROMless Microcontroller | |||
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80C32E
Table 7. External Clock Drive Characteristics (XTAL1)
Symbol
Parameter
Min
Max
Unit
TCLCL
TCHCX
TCLCX
TCLCH
TCHCL
Oscillator Period
High Time
Low Time
Rise Time
Fall Time
33.33
ns
5
ns
5
ns
5
ns
5
ns
Figure 11. External Clock Drive Waveforms
VCC-0.5 V
0.45 V
0.7VCC
0.2VCC-0.1V
TCHCL
TCLCX
TCHCX
TCLCH
TCLCL
Figure 12. AC Testing Input/Output Waveforms
INPUT/OUTPUT
VCC-0.5V
0.45V
0.2VCC+0.9
0.2VCC-0.1
Figure 13. Float Waveforms
AC inputs during testing are driven at VCC - 0.5 for a logic â1â and 0.45V for a logic â0â.
Timing measurement are made at VIH min for a logic â1â and VIL max for a logic â0â.
FLOAT
VOH-0.1V VLOAD
VOL+0.1V
VLOAD+0.1V
VLOAD-0.1V
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 VOH/VOL level
occurs. IOL/IOH ⥠± 20 mA.
15
4149NâAEROâ04/07
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