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ST7MC1K2 数据表(PDF) 214 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 214 Page - STMicroelectronics |
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214 / 371 page  Obsolete Product(s) - Obsolete Product(s) On-chip peripherals ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto 214/371 In switched mode the user must process the step duration and commutation time by software. In autoswitched mode the commutation action is performed automatically depending on the rotor position information and register contents. This is called the hardware commutation event CH. When enabled by the SC bit in the MCRC register, commutation can also be simulated by writing a value directly in the MCOMP register that is compared with the MTIM value. This is called simulated commutation CS (Built-in checks and controls for simulated events on page 221). Both in switched mode and autoswitched mode, if the SC bit in the MCRC register is set (software commutation enabled), no comparison between the MCOMP and MTIM register is enabled before a write access in the MCOMP register. This means that if the SC bit is set and no write access is done after in the MCOMP register, no CS commutation event occurs. In speed measurement mode, when using encoder or tachogenerator speed sensors (that is, both TES[1:0] bits in the MPAR register are not reset and the input detection block is set- up to process sensor signals), motor speed can be measured but it is not possible drive a motor in six-step mode, either sensored or sensorless. Speed measurement mode is useful for motors supplied with 3-phase sinewave-modulated PWM signals: ● AC induction motors, ● Permanent magnet AC (PMAC) motors (although it needs three position sensors, they can be handled just like tachogenerator signals). This mode uses only part of the delay manager’s resources. For more details refer to Speed measurement mode on page 227. Switched mode This feature allows the motor to be run step-by-step. This is useful when the rotor speed is still too low to generate a BEMF. It can also run other kinds of motor without BEMF generation such as induction motors or switch reluctance motors. This mode can also be used for autoswitching with all computation for the next commutation time done by software (hardware multiplier not used) and using the powerful interrupt set of the peripheral. In this mode, the step time is directly written by software in the commutation compare register MCOMP. When the MTIM timer reaches this value a commutation occurs (C event) and the MTIM timer is reset. At this time all registers with a preload function are loaded (see Section 10.6.13: MTC registers on page 260). The CI bit of MISR is set and if the CIM bit in the MIMR register is set an interrupt is generated. The MTIM timer prescaler (step ratio bits ST[3:0] in the MPRSR register) is user programmable. Access to this register is not allowed while the MTIM timer is running (access is possible only before the starting the timer by means of the CKE bit) but the Table 95. Switched and autoswitched modes SWA bit Commutation type MCOMP user access 0 Switched mode Read/Write 1 Autoswitched mode Obsolete Product(s) - Obsolete Product(s) |
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