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C868_02 Datasheet, PDF (75/244 Pages) Infineon Technologies AG – 8 - Bit CMOS Microcontroller | |||
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C868
On-Chip Peripheral Components
4.7
Capture/Compare Unit (CCU6)
The CCU6 provides two independent timers (T12, T13), which can be used for PWM
generation, especially for AC-motor control. Additionally, special control modes for block
commutation and multi-phase machines are supported.
Timer 12 Features
⢠Three capture/compare channels, each channel can be used either as capture or as
compare channel.
⢠Generation of a three-phase PWM supported (six outputs, individual signals for
highside and lowside switches)
⢠16 bit resolution, maximum count frequency = system clock
⢠Dead-time control for each channel to avoid short-circuits in the power stage
⢠Concurrent update of the required T12/13 registers
⢠Center-aligned and edge-aligned PWM can be generated
⢠Single-shot mode supported
⢠Many interrupt request sources
⢠Hysteresis-like control mode
Timer 13 Features
⢠One independent compare channel with one output
⢠16 bit resolution, maximum count frequency = system clock
⢠Can be synchronized to T12
⢠Interrupt generation at period-match and compare-match
⢠Single-shot mode supported
Additional Features
⢠Block commutation for Brushless DC-drives implemented
⢠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
⢠Capture/compare unit can be powerdown in normal, idle and slow-down modes
The timer T12 can work in capture and/or compare mode for its three channels. The
modes can also be combined. 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 (refer to figure âModulation
Selection, Passive Level and Alternate Output Enable of T12â) for the signal modulation.
Userâs Manual
4-31
V 0.4, 2002-01
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