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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） |
| 文件頁數(shù)： | 40/44頁 |
| 文件大小： | 342K |
| 代理商： | MC68HC708MP16 |
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Application Note
AN1712
40
MOTOROLA
new one. This delay causes a shift in the rotor angle over which the
windings are energized. At slow speeds, the shift is minimal and typically
is ignored. At high speeds, by the time the field becomes established in
the winding, the rotor already has moved past the point where optimal
torque can be developed. The result is a second order reduction in motor
torque at higher speeds.
To compensate for this effect, the "on-time" angles of the windings can
be advanced in exactly the same way and for the same reason as a
spark advance on a gasoline engine. Assume that the desired
commutation advance (
ψ
) is specified as a fraction of the commutation
interval (for instance, 0
≤ ψ ≤
1). If count
1
and count
2
are the timer values
corresponding to the last two Hall signal transitions, the timer value
corresponding to the desired commutation angle can be estimated as:
count
c
= (count
2
– count
1
) (1 –
ψ
) + count
2
When the free-running timer value equals count
c
, the timer hardware
informs the CPU that it is time to change the waveforms to the motor.
HC08MP16 as a Smart Peripheral for Motor Control
A few applications may require more calculating power than the CPU08
is capable of (for instance, sensorless vector control). However, the
PWM module on the 'MP16 still can be used by programming the 'MP16
to act as a "smart" peripheral, as shown in
Figure 23
. In this case, the
program in the 'MP16 has a single function, that being to parse and
execute the commands sent to it from the host processor via its SPI
interface, which can clock data at a rate of 8 million bits per second.
These commands could be anything from generating a PWM output to
reporting an A/D input value. Incidentally, the SPI module is also useful
in stand-alone applications by using it in master mode to communicate
to off-chip peripherals that support the SPI interface standard.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC708MP16CFU | 制造商:MAJOR 功能描述: |
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| MC68HC711D3CFNE2 | 功能描述:8位微控制器 -MCU 8B OTP 192RAM 2 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC68HC711D3CFNE3 | 功能描述:8位微控制器 -MCU 8B OTP 192RAM 2 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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