AT89C55WD-24AU Atmel, AT89C55WD-24AU Datasheet - Page 13

• Manufacturer Part Number: AT89C55WD-24AU
• Description: IC 8051 MCU FLASH 20K 44TQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C55WD-24AU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: UART/USART
• Peripherals: WDT
• Number Of I /o: 32
• Program Memory Size: 20KB (20K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: UART
• Maximum Clock Frequency: 33 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 4 V to 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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
13