Datasheet

13
1921D–MICRO–6/08
AT89C55WD
Figure 12-3. Timer 2 Auto Reload Mode (DCEN = 1)
Table 12-2. T2MOD – Timer 2 Mode Control Register
T2MOD Address = 0C9H Reset Value = XXXX XX00B
Not Bit Addressable
––––––T2OEDCEN
Bit76543210
Symbol Function
– Not implemented, reserved for future
T2OE Timer 2 Output Enable bit
DCEN When set, this bit allows Timer 2 to be configured as an up/down counter
OSC
EXF2
TF2
T2EX PIN
COUNT
DIRECTION
1=UP
0=DO
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)