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ST7MC1K2 数据表(PDF) 254 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 254 Page - STMicroelectronics |
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254 / 371 page  Obsolete Product(s) - Obsolete Product(s) On-chip peripherals ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto 254/371 PWM operating mode The PWM generator can work in center-aligned or edge-aligned mode depending on the CMS bit setting in the MPCR register. Figure 119 shows the corresponding counting sequence. It offers also an 8-bit mode to get a full 8-bit range with a single compare register write access by setting the PMS bit in MPCR register. The comparisons described here are performed between the PWM counter value extended to 13 bits and the 13-bit compare register. Having a compare range greater than the counter range is mandatory to get a full PWM range (that is, up to 100% modulation). This principle is maintained for 8-bit PWM operations. Center-aligned mode (CMS bit = 1) In this operating mode, the PWM counter counts up to the value loaded in the 12-bit compare 0 register then counts down until it reaches zero and restarts counting up. The PWM signals are set to ‘0’ when the PWM counter reaches, in up-counting, the corresponding 13-bit compare register value and they are set to ‘1’ when the PWM counter reaches the 13-bit compare value again in down-counting. Figure 119. Counting sequence in center-aligned and edge-aligned mode If the 13-bit compare register value is greater than the extended compare 0 register (the 13th bit is set to ‘0’), the corresponding PWM output signal is held at ‘1’. If the 13-bit compare register value is 0, the corresponding PWM output signal is held at ‘0’. Figure 120 shows some center-aligned PWM waveforms in an example where the compare 0 register value = 8. Center-aligned mode 0 1 2 .... 15 16 15 .... 2 1 0 1 T Edge-aligned mode 0 1 2 ..... 15 16 0 1 ..... 16 0 1 T T = PWM period, value of 12-bit compare 0 register = 16 Obsolete Product(s) - Obsolete Product(s) |
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