AT89C55-24QI Atmel, AT89C55-24QI Datasheet - Page 9

• Manufacturer Part Number: AT89C55-24QI
• Description: Microcontrollers (MCU) Microcontroller
• Manufacturer: Atmel

Specifications of AT89C55-24QI

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 20 KB
• Data Ram Size: 256 B
• Interface Type: UART
• Maximum Clock Frequency: 24 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: PQFP-44
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: No

Figure 3. Timer 2 Auto Reload Mode (DCEN = 1)
Figure 4. Timer 2 in Baud Rate Generator Mode
OSC
÷
T2 PIN
12
C/T2 = 0
C/T2 = 1
TR2
CONTROL
(DOWN COUNTING RELOAD VALUE)
(UP COUNTING RELOAD VALUE)
RCAP2H
0FFH
TH2
RCAP2L
0FFH
TL2
OVERFLOW
T2EX PIN
COUNT
DIRECTION
1=UP
0=DOWN
TOGGLE
INTERRUPT
TIMER 2
TF2
EXF2
4-177