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STA321 数据表(PDF) 53 Page - STMicroelectronics |
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STA321 数据表(HTML) 53 Page - STMicroelectronics |
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53 / 157 page  STA321 FFX Doc ID 15351 Rev 3 53/157 PWM output B can be similarly modulated via bits PM_nB: with the wave starting from level 1 at the beginning of the period, and falling to level 0 when the audio signal intersects the down-carrier; with the wave starting from level 0 at the beginning of the period, and rising to level 1 when the audio signal intersects the up-carrier; The hybrid mode is the toggling between the two methods of modulation for each PWM period. Figure 30. PWM modes for outputs A and B The various single output modulation schemes can be combined together on the two outputs to get the desired differential modulation schemes. PWM mode for output A dn dn up up PWM mode for output B 00: dn -> rising 01: up -> falling 10: hybrid 1 11: hybrid 2 00: dn -> falling 01: up -> rising 10: hybrid 1 11: hybrid 2 |
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