AT89S52-33AC ATMEL Corporation, AT89S52-33AC Datasheet - Page 12

• Manufacturer Part Number: AT89S52-33AC
• Description: 8-bit Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

Figure 7. Timer 2 Auto Reload Mode (DCEN = 1)
Figure 8. Timer 2 in Baud Rate Generator Mode
12
T2EX PIN
OSC
OSC
T2 PIN
T2 PIN
÷
÷
12
2
TRANSITION
DETECTOR
AT89S52
NOTE: OSC. FREQ. IS DIVIDED BY 2, NOT 12
C/T2 = 0
C/T2 = 1
C/T2 = 0
C/T2 = 1
TR2
EXEN2
TR2
CONTROL
(DOWN COUNTING RELOAD VALUE)
CONTROL
CONTROL
(UP COUNTING RELOAD VALUE)
RCAP2H
0FFH
TH2
RCAP2H
TH2
EXF2
RCAP2L
0FFH
TL2
RCAP2L
TL2
OVERFLOW
INTERRUPT
TIMER 2
T2EX PIN
÷
2
"1"
"1"
COUNT
DIRECTION
1=UP
0=DOWN
TIMER 1 OVERFLOW
"0"
"0"
"0"
TOGGLE
INTERRUPT
"1"
TIMER 2
TF2
÷
÷
SMOD1
RCLK
TCLK
16
16
EXF2
CLOCK
CLOCK
Rx
Tx