參數(shù)資料
型號(hào)： MC68HC708MP16
廠商： Motorola, Inc.
英文描述： 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述： 8位微控制器單元（MCU）。（8位微控制器）
文件頁(yè)數(shù)： 36/44頁(yè)
文件大?。?/td> 342K
代理商： MC68HC708MP16
Application Note
AN1712
36
MOTOROLA
Brushless DC Motor Controller
Figure 21
illustrates an example of how the 'MP16 can be used to
control a brushless DC motor. By connecting the Hall effect signals to
the 'MP16 timer inputs, some interesting control schemes become
possible. TCH0B through TCH2B are each programmed to perform an
input capture function on any edge for the three Hall sensor signals that
define the commutation intervals. When an edge is detected, an interrupt
is generated informing the CPU to change the waveforms to the motor.
In the interrupt service routine, the rotor position is determined by
examining the state of the TCH0B through TCH2B inputs. This is done
by reading the port E data register, which reflects the state of the input
pins even when they are being used by the timer. Once the rotor position
is determined, the 'MP16 can combine this knowledge with the desired
rotation direction information and apply the appropriate motor drive
signals, as illustrated in the example in
Figure 22
.
When a transition occurs on one of the Hall sensor signals, a time stamp
of the event is recorded in the appropriate channel register. This
information can be used to calculate accurately the speed of the motor
shaft. Recall that the speed of a rotating body is defined as:
ω
(t) =d
θ
(t)
dt
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參數(shù)描述
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