AT89S52 Atmel Corporation, AT89S52 Datasheet - Page 14

• Manufacturer Part Number: AT89S52
• Manufacturer: Atmel Corporation

Specifications of AT89S52

• Flash (kbytes): 8 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 5.5
• Timers: 3
• Isp: SPI
• Watchdog: Yes

Figure 10-2. Timer 2 Auto Reload Mode (DCEN = 0)
Figure 10-3. Timer 2 Auto Reload Mode (DCEN = 1)
14
T2EX PIN
OSC
AT89S52
OSC
T2 PIN
T2 PIN
÷
12
÷12
TRANSITION
DETECTOR
C/T2 = 0
C/T2 = 1
C/T2 = 0
C/T2 = 1
TR2
CONTROL
EXEN2
(DOWN COUNTING RELOAD VALUE)
(UP COUNTING RELOAD VALUE)
CONTROL
TR2
CONTR OL
RELO AD
RCAP2H
0FFH
TH2
RCAP2L
0FFH
RCAP2H
TL2
TH2
OVERFLOW
RCAP2L
TL2
T2EX PIN
COUNT
DIRECTION
1=UP
0=DOWN
OVERFLOW
EXF2
TF2
TOGGLE
INTERRUPT
TIMER 2
TF2
INTERRUPT
TIMER 2
1919D–MICRO–6/08
EXF2