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AT89C52-24AI Datasheet(PDF) 9 Page - ATMEL Corporation |
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AT89C52-24AI Datasheet(HTML) 9 Page - ATMEL Corporation |
9 / 24 page AT89C52 9 Figure 3. Timer 2 Auto Reload Mode (DCEN = 1) Figure 4. Timer 2 in Baud Rate Generator Mode OSC EXF2 TF2 T2EX PIN COUNT DIRECTION 1=UP 0=DOWN T2 PIN TR2 CONTROL OVERFLOW (DOWN COUNTING RELOAD VALUE) (UP COUNTING RELOAD VALUE) TOGGLE TIMER 2 INTERRUPT 12 RCAP2L RCAP2H 0FFH 0FFH TH2 TL2 C/T2 = 0 C/T2 = 1 ÷ OSC SMOD1 RCLK TCLK Rx CLOCK Tx CLOCK T2EX PIN T2 PIN TR2 CONTROL "1" "1" "1" "0" "0" "0" TIMER 1 OVERFLOW NOTE: OSC. FREQ. IS DIVIDED BY 2, NOT 12 TIMER 2 INTERRUPT 2 2 16 16 RCAP2L RCAP2H TH2 TL2 C/T2 = 0 C/T2 = 1 EXF2 CONTROL TRANSITION DETECTOR EXEN2 ÷ ÷ ÷ ÷ |
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