Datasheet

14
1919C–MICRO–3/05
AT89S52
Figure 10-2. Timer 2 Auto Reload Mode (DCEN = 0)
Figure 10-3. Timer 2 Auto Reload Mode (DCEN = 1)
OSC
EXF2
TF2
T2EX PIN
T2 PIN
TR2
EXEN2
C/T2 = 0
C/T2 = 1
CONTR OL
RELOAD
CONTROL
TRANSITION
DETECTOR
TIMER 2
INTERRUPT
÷12
RCAP2LRCAP2H
TH2 TL2
OVERFLOW
OSC
EXF2
TF2
T2EX PIN
COUNT
DIRECTION
1=UP
0=DOWN
T2 PIN
TR2
CONTROL
OVERFLOW
TOGGLE
TIMER 2
INTERRUPT
12
RCAP2LRCAP2H
0FFH0FFH
TH2 TL2
C/T2 = 0
C/T2 = 1
÷
(DOWN COUNTING RELOAD VALUE)
(UP COUNTING RELOAD VALUE)