Intel MCS 51

i@.
8XC52/54/58
HARDWARE DESCRIPTION
----- -. .------ ...... . - ------ -------- ..-=-----
T2MODAddress= OC9H
ResetValue= )(XXXXXOOB
NotBitAddressable
—
— — — —
—
T20E DCEN
Bit 7
6
5
4 3 2
1
0
8ymbol
Function
Notimplemented,reservedforfutureuse.
T20E
Timer2 OutputEnablebit.
DCEN
Whenset,thisbitallowsTimer2 tobeconfiguredasanup/downcounter.
d
cm=
1
OVERFLOW
TR2
RELOAD
T2 PIN
TIMER2
INTERRUPT
TRANSMON
DEI’ECTION
T2EX PIN
I+q
I CONTROL
EXEN2
2707S2-2
Figure 2. Timer2 Auto Reload Mode (DCEN = O)
(DOWN COUNTINGRELOADVALUE)
TOGGLE
1
OFFH
1
OFFH
[
&f
cfi2=t #~NTROL
TIMER2
T2 PIN
INTERRUPT
(UP COUNTINGRELOADVALUE)
T2EX PIN
2707SS-3
Figure 3. Timer 2 Auto Reload Mode (DCEN = 1)
4-7