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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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AT89LP428 数据表(PDF) 79 Page - ATMEL Corporation |
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AT89LP428 数据表(HTML) 79 Page - ATMEL Corporation |
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79 / 149 page  79 3654A–MICRO–8/09 AT89LP428/828 16.2 Baud Rates The baud rate in Mode 0 depends on the value of the SMOD1 bit in Special Function Register PCON.7. If SMOD1 = 0 (the value on reset) and TB8 = 0, the baud rate is 1/4 of the oscillator frequency. If SMOD1 = 1 and TB8 = 0, the baud rate is 1/2 of the oscillator frequency, as shown in the following equation: The baud rate in Mode 2 also depends on the value of the SMOD1 bit. If SMOD1 = 0, the baud rate is 1/32 of the oscillator frequency. If SMOD1 = 1, the baud rate is 1/16 of the oscillator fre- quency, as shown in the following equation: 16.2.1 Using Timer 1 to Generate Baud Rates Setting TB8 = 1 in Mode 0 enables Timer 1 as the baud rate generator. When Timer 1 is the baud rate generator for Mode 0, the baud rates are determined by the Timer 1 overflow rate and the value of SMOD1 according to the following equation: The Timer 1 overflow rate normally determines the baud rates in Modes 1 and 3. When Timer 1 is the baud rate generator, the baud rates are determined by the Timer 1 overflow rate and the value of SMOD1 according to the following equation: The Timer 1 interrupt should be disabled in this application. The Timer itself can be configured for either timer or counter operation in any of its 3 running modes. In the most typical applica- tions, it is configured for timer operation in auto-reload mode (high nibble of TMOD = 0010B). In this case, the baud rate is given by the following formula: Mode 0 Baud Rate TB8 = 0 2 SMOD1 4 -------------------- Oscillator Frequency × = Mode 2 Baud Rate 2 SMOD1 32 -------------------- Oscillator Frequency × = Mode 0 Baud Rate TB8 = 1 2 SMOD1 4 -------------------- (Timer 1 Overflow Rate) × = Modes 1, 3 Baud Rate 2 SMOD1 32 -------------------- (Timer 1 Overflow Rate) × = Modes 1, 3 Baud Rate 2 SMOD1 32 -------------------- Oscillator Frequency 256 TH1 () – [] ------------------------------------------------------- 1 TPS 1 + --------------------- × × = |
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