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XC888LM Datasheet(PDF) 102 Page - Infineon Technologies AG |
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XC888LM Datasheet(HTML) 102 Page - Infineon Technologies AG |
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102 / 144 page  XC886/888CLM Functional Description Data Sheet 95 V0.9, 2006-12 3.19 Capture/Compare Unit 6 The Capture/Compare Unit 6 (CCU6) provides two independent timers (T12, T13), which can be used for Pulse Width Modulation (PWM) generation, especially for AC-motor control. The CCU6 also supports special control modes for block commutation and multi-phase machines. The timer T12 can function in capture and/or compare mode for its three channels. The timer T13 can work in compare mode only. The multi-channel control unit generates output patterns, which can be modulated by T12 and/or T13. The modulation sources can be selected and combined for the signal modulation. Timer T12 Features • Three capture/compare channels, each channel can be used either as a capture or as a compare channel • Supports generation of a three-phase PWM (six outputs, individual signals for highside and lowside switches) • 16-bit resolution, maximum count frequency = peripheral clock frequency • Dead-time control for each channel to avoid short-circuits in the power stage • Concurrent update of the required T12/13 registers • Generation of center-aligned and edge-aligned PWM • Supports single-shot mode • Supports many interrupt request sources • Hysteresis-like control mode Timer T13 Features • One independent compare channel with one output • 16-bit resolution, maximum count frequency = peripheral clock frequency • Can be synchronized to T12 • Interrupt generation at period-match and compare-match • Supports single-shot mode Additional Features • Implements block commutation for Brushless DC-drives • Position detection via Hall-sensor pattern • Automatic rotational speed measurement for block commutation • Integrated error handling • Fast emergency stop without CPU load via external signal (CTRAP) • Control modes for multi-channel AC-drives • Output levels can be selected and adapted to the power stage The block diagram of the CCU6 module is shown in Figure 33. |
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