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ST7MC1K2 数据表(PDF) 204 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 204 Page - STMicroelectronics |
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204 / 371 page  Obsolete Product(s) - Obsolete Product(s) On-chip peripherals ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto 204/371 Specific applications can require sampling for the Z event detection only during the ON time of the PWM signal. This can happen when the PWM signal is applied only on the low side switches for Z event detection. In this case, during the OFF time of the PWM signal, the phase voltage is tied to the application voltage V and no back-EMF signal can be seen. During the ON time of the PWM signal, the phase voltage can be compared to the neutral point voltage and the Z event can be detected. Therefore, it is possible to add a programmable delay before sampling (which is normally done when the PWM signal is switched ON) to perform the sampling during the ON time of the PWM signal. This delay is set with the DS [3:0] bits in the MCONF register. As soon as a delay is set in the DS[3:0] bits, the minimum OFF time for the PWM signal is no longer required and it is automatically set to 0µs in current mode in the internal sampling clock and a true 100% duty cycle can be set in the 12-bit PWM generator compare U register if needed. Depending on the frequency and the duty cycle of the PWM signal, the delay inserted before sampling could cause it sample the signal OFF time instead of the ON time. In this case an interrupt can be generated and the sample is not taken into account. When a sample occurs outside the PWM signal ON time, the SOI bit in the MCONF register is set and an interrupt request is generated if the SOM bit is set in the MCONF register. This interrupt is enabled only if a delay value has been set in the DS[3:0] bits. In this case, the sampling is done at the PWM frequency but only during the ON time of the PWM signal. Figure 85 and Figure 86 show in detail the generation of the sampling order when the delay is added. Table 91. Delay length before sampling(1) 1. Times are indicated for 4 MHz fPERIPH. DS3 DS2 DS1 DS0 Delay added to sample at TON 0 0 0 0 No delay added. Sample during TOFF 000 1 2.5 µs 001 0 5 µs 001 1 7.5 µs 0 1 0 0 10 µs 0 1 0 1 12.5 µs 0 1 1 0 15 µs 0 1 1 1 17.5 µs 1 0 0 0 20 µs 1 0 0 1 22.5 µs 1 0 1 0 25 µs 1 0 1 1 27.5 µs 1 1 0 0 30 µs 1 1 0 1 32.5 µs 1 1 1 0 35 µs 1 1 1 1 37.5 µs Obsolete Product(s) - Obsolete Product(s) |
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