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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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PC87570-ICC/VUL 数据表(PDF) 108 Page - National Semiconductor (TI) |
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PC87570-ICC/VUL 数据表(HTML) 108 Page - National Semiconductor (TI) |
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108 / 168 page  Multi-Function 16-Bit Timer (MFT16) 108 www.national.com 14.3.5 Counter Clock Source Select The clock source unit contains two clock source selectors which allow you to independently select the clock source for each of the two 16-bit counters from one of the following sources: • No clock, in which case the counter is stopped • Prescaled system clock • External Event count based on TB • Pulse Accumulate mode based on TB • Slow Speed Clock i.e., 32.768 KHz 14.4 TIMER/COUNTER AND ACTION UNIT The timer/counter and action unit consists of two 16-bit counters, TCNT1 and TCNT2, plus two 16-bit reload/cap- ture registers, TCRA and TCRB. The timers are down counters capable of triggering events on underflow detec- tion (count from 0000h to FFFFh). In addition, it contains the mode control logic which allows the timer to operate in any of four operation modes described below. Different interrupts can be triggered on certain conditions and the functionality of the I/O pins change depending of the mode of operation. Therefore the interrupt control and I/O control are an integral part of the timer/counter unit. 14.4.1 Operation Modes You can configure the MFT16 to operate in any one of four modes, as summarized in Table 14-1 and described in this section. Table 14-1. Operation Modes Mode Description Timer/Counter 1 ( TCNT1) Reload/Capture A ( TCRA) Reload/Capture B ( TCRB) Timer/Counter 2 ( TCNT2) 1 PWM and system timer or external event counter Counter for PWM Auto Reload A = PWM time I Auto reload = PWM time II System Timer or external event counter 2 Dual input capture and system timer Capture A and B time base Capture counter 1 value on TA event Capture counter 1 value on TB event System Timer 3 Dual independent timer Time base for first timer Reload register for timer/counter I Reload register for timer/counter II Time base for second timer 4 Input capture and timer Time base for first timer Reload register for timer/counter I Capture counter 1 value on TB event Capture B time base |
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