AT89C55WD Atmel Corporation, AT89C55WD Datasheet - Page 13

• Manufacturer Part Number: AT89C55WD
• Manufacturer: Atmel Corporation

Specifications of AT89C55WD

• Flash (kbytes): 20 Kbytes
• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Uart: 1
• Sram (kbytes): 0.25
• Operating Voltage (vcc): 4.0 to 6.0
• Timers: 3
• Watchdog: Yes

Table 12-2.
Figure 12-3. Timer 2 Auto Reload Mode (DCEN = 1)
1921D–MICRO–6/08
Symbol
–
T2OE
DCEN
T2MOD Address = 0C9H
Not Bit Addressable
Bit
OSC
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
–
7
T2 PIN
÷
12
–
6
C/T2 = 0
C/T2 = 1
–
5
TR2
CONTROL
(DOWN COUNTING RELOAD VALUE)
(UP COUNTING RELOAD VALUE)
–
4
RCAP2H
0FFH
TH2
–
3
RCAP2L
0FFH
TL2
OVERFLOW
–
2
Reset Value = XXXX XX00B
T2EX PIN
T2OE
COUNT
DIRECTION
1=UP
0=DO
1
TOGGLE
AT89C55WD
INTERRUPT
DCEN
TIMER 2
0
TF2
EXF2
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