at89c51rc-33pc ATMEL Corporation, at89c51rc-33pc Datasheet - Page 15

• Manufacturer Part Number: at89c51rc-33pc
• Description: 8-bit Microcontroller With 32k Bytes Flash
• Manufacturer: ATMEL Corporation

Figure 13-2. Timer 2 Auto Reload Mode (DCEN = 0)
Table 13-2.
Figure 13-3. Timer 2 Auto Reload Mode (DCEN = 1)
1920C–MICRO–03/05
Symbol
–
T2OE
DCEN
T2MOD Address = 0C9H
Not Bit Addressable
Bit
T2EX PIN
Function
Not implemented, reserved for future
Timer 2 Output Enable bit
When set, this bit allows Timer 2 to be configured as an up/down counter
T2MOD—Timer 2 Mode Control Register
OSC
–
7
OSC
T2 PIN
T2 PIN
12
12
–
6
TRANSITION
DETECTOR
C/T2 = 0
C/T2 = 1
C/T2 = 0
C/T2 = 1
–
5
TR2
EXEN2
CONTROL
(DOWN COUNTING RELOAD VALUE)
(UP COUNTING RELOAD VALUE)
CONTROL
TR2
–
4
CONTR OL
RELO AD
RCAP2H
0FFH
TH2
RCAP2L
–
3
0FFH
RCAP2H
TL2
TH2
OVERFLOW
RCAP2L
TL2
–
2
T2EX PIN
Reset Value = XXXX XX00B
COUNT
DIRECTION
1=UP
0=DO
OVERFLOW
TOGGLE
T2OE
EXF2
TF2
1
INTERRUPT
TIMER 2
TF2
AT89C51RC
INTERRUPT
EXF2
DCEN
TIMER 2
0
15