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ST92185B2 Datasheet(PDF) 161 Page - STMicroelectronics |
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ST92185B2 Datasheet(HTML) 161 Page - STMicroelectronics |
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161 / 178 page  161/178 ST92185B - PWM GENERATOR 7.9 PWM GENERATOR 7.9.1 Introduction The PWM (Pulse Width Modulated) signal genera- tor allows the digital generation of up to 8 analog outputs when used with an external filtering net- work. The unit is based around an 8-bit counter which is driven by a programmable 4-bit prescaler, with an input clock signal equal to the internal clock INTCLK divided by 2. For example, with a 12 MHz Internal clock, using the full 8-bit resolution, a fre- quency range from 1465 Hz up to 23437 Hz can be achieved. Higher frequencies, with lower resolution, can be achieved by using the autoclear register. As an ex- ample, with a 12 MHz Internal clock, a maximum PWM repetition rate of 93750 Hz can be reached with 6-bit resolution. Note: The number of output pins is device de- pendant. Refer to the device pinout description. Figure 102. PWM Block Diagram. Autoclear Compare 7 Compare 6 Compare 5 Compare 4 Compare 3 Compare 2 Compare 1 Compare 0 VR01765 PWM7 PWM0 8 Bit Counter 4 Bit Presc. Control Logic INTCLK/2 |
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