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AT89S52-24AC Scheda tecnica(PDF) 16 Page - ATMEL Corporation |
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AT89S52-24AC Scheda tecnica(HTML) 16 Page - ATMEL Corporation |
16 / 39 page 16 1919C–MICRO–3/05 AT89S52 Figure 11-1. Timer 2 in Baud Rate Generator Mode 12. Programmable Clock Out A 50% duty cycle clock can be programmed to come out on P1.0, as shown in Figure 12-1. This pin, besides being a regular I/O pin, has two alternate functions. It can be programmed to input the external clock for Timer/Counter 2 or to output a 50% duty cycle clock ranging from 61 Hz to 4 MHz (for a 16-MHz operating frequency). To configure the Timer/Counter 2 as a clock generator, bit C/T2 (T2CON.1) must be cleared and bit T2OE (T2MOD.1) must be set. Bit TR2 (T2CON.2) starts and stops the timer. The clock-out frequency depends on the oscillator frequency and the reload value of Timer 2 capture registers (RCAP2H, RCAP2L), as shown in the following equation. In the clock-out mode, Timer 2 roll-overs will not generate an interrupt. This behavior is similar to when Timer 2 is used as a baud-rate generator. It is possible to use Timer 2 as a baud-rate gen- erator and a clock generator simultaneously. Note, however, that the baud-rate and clock-out frequencies cannot be determined independently from one another since they both use RCAP2H and RCAP2L. 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 ÷ ÷ ÷ ÷ Clock-Out Frequency Oscillator Frequency 4 x [65536-(RCAP2H,RCAP2L)] ------------------------------------------------------------------------------------- = |
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