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AT89S8252 Datasheet(PDF) 15 Page - ATMEL Corporation |
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AT89S8252 Datasheet(HTML) 15 Page - ATMEL Corporation |
15 / 41 page 15 AT89S8252 0401G–MICRO–3/06 Figure 4. Timer 2 in Baud Rate Generator Mode Baud Rate Generator Timer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON (Table 2). Note that the baud rates for transmit and receive can be different if Timer 2 is used for the receiver or transmitter and Timer 1 is used for the other function. Setting RCLK and/or TCLK puts Timer 2 into its baud rate generator mode, as shown in Figure 4. The baud rate generator mode is similar to the auto-reload mode, in that a rollover in TH2 causes the Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2H and RCAP2L, which are preset by software. The baud rates in Modes 1 and 3 are determined by Timer 2’s overflow rate according to the following equation. The Timer can be configured for either timer or counter operation. In most applications, it is configured for timer operation (CP/T2 = 0). The timer operation is different for Timer 2 when it is used as a baud rate generator. Normally, as a timer, it increments every machine cycle (at 1/12 the oscillator frequency). As a baud rate generator, however, it increments every state time (at 1/2 the oscillator frequency). The baud rate formula is given below. where (RCAP2H, RCAP2L) is the content of RCAP2H and RCAP2L taken as a 16-bit unsigned integer. 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 ÷ ÷ ÷ ÷ Modes 1 and 3 Baud Rates Timer 2 Overflow Rate 16 ------------------------------------------------------------ = Modes 1 and 3 Baud Rate --------------------------------------- Oscillator Frequency 32 65536 RCAP2H,RCAP2L () – [] × ---------------------------------------------------------------------------------------------- = |
Similar Part No. - AT89S8252_06 |
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Similar Description - AT89S8252_06 |
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