AT89C51RC Atmel Corporation, AT89C51RC Datasheet - Page 15

• Manufacturer Part Number: AT89C51RC
• Manufacturer: Atmel Corporation

Specifications of AT89C51RC

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Uart: 1
• Sram (kbytes): 0.5
• Operating Voltage (vcc): 4.0 to 6.0
• Timers: 3
• Watchdog: Yes

Figure 13-2. Timer 2 Auto Reload Mode (DCEN = 0)
Table 13-2.
Figure 13-3. Timer 2 Auto Reload Mode (DCEN = 1)
1920D–MICRO–6/08
Symbol
–
T2OE
DCEN
T2MOD Address = 0C9H
Not Bit Addressable
Bit
T2EX PIN
Not implemented, reserved for future
When set, this bit allows Timer 2 to be configured as an up/down counter
Function
Timer 2 Output Enable bit
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
DCEN
EXF2
TIMER 2
0
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