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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SN250 데이터시트(PDF) 89 Page - STMicroelectronics |
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SN250 데이터시트(HTML) 89 Page - STMicroelectronics |
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89 / 130 page  SN250 Functional description—application modules 89/130 7.4 General purpose timers The SN250 integrates two general-purpose, 16-bit timers—TMR1 and TMR2. Each of the two timers contains the following features: ● Configurable clock source ● Counter load ● Two output compare registers ● Two input capture registers ● Can be configured to do PWM ● Up/down counting (for PWM motor drive phase correction) ● Single shot operation mode (timer stops at zero or threshold) Figure 9 is a block diagram of the Timer TMR1 module. Timer TMR2 is identical. Figure 9. Timer TMR1 block diagram 7.4.1 Clock sources The clock source for each timer can be chosen from the main 12MHz clock, 32.768kHz clock, 1kHz RC-Clock, or from an external source (up to 100kHz) through TMR1CLK or TMR2CLK. After choosing the clock source (see Table 28), the frequency can be further divided to generate the final timer cycle provided to the timer controller (see Table 29). In addition, the clock edge (either rising or falling) for this timer clock can be selected (see Table 30). |
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