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| 型號： | 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） |
| 文件頁數(shù)： | 20/44頁 |
| 文件大?。?/td> | 342K |
| 代理商： | MC68HC708MP16 |
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Application Note
AN1712
20
MOTOROLA
Load ’Em and Leave ’Em
The 'MP16 relies heavily on "write-once" registers as the cornerstone to
its output protection strategy. Many programmable features such as the
PWM output polarities are actually fixed system parameters that should
not require changing once they are specified. Without such protection, if
the polarities are changed inadvertently by a software bug or runaway
code after being correctly loaded, the software engineer could be forced
into the awkward position of having to inform the hardware engineer that
his or her board has blown up.
In the spirit of increasing motor drive longevity, Motorola has designated
as write-once registers some of these registers that could affect the
protection integrity. For instance, the software may write to them only
one time after each reset.
These registers and their addresses are:
Configuration Register
Dead-Time Register
PWM Disable Mapping Register
(CONFIG)
(DEADTM)
(DISMAP)
$001F
$0036
$0037
Application Examples
Despite the wide diversity of motor types available today, it may come
as quite a surprise to realize that most motors work pretty much the
same way. For example, torque is developed in an AC induction motor
the same way it is in a DC motor. This realization led Felix Blaschke, a
researcher at Siemens, in 1968 to pioneer the concept of field orientation
with induction motors
[2]
. Even the stepper motor (which is often
inappropriately described as a "digital" motor) is really an analog motor
that develops torque the same way as other motors.
The design of the 'MP16 PWM module capitalizes on these similarities,
which allows it to control many different types of motors. A few examples
illustrating this point are given here.
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