User Manual

104
T89C51AC2
Rev. B – 19-Dec-01
18.4.12 Float Waveforms
For timing purpos es as 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. I
OL
/I
OH
≥±20mA.
18.4.13 Clock Waveforms Valid i n normal clock mode. In X2 m ode XTA L2 must be changed to XTAL2/2.
FLOAT
V
OH
-0.1V
V
OL
+0.1V
V
LOAD
V
LOAD
+0.1V
V
LOAD
-0.1V