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)： 22/44頁(yè)
文件大?。?/td> 342K
代理商： MC68HC708MP16
Application Note
AN1712
22
MOTOROLA
look-up table in the processor's memory and spooling data out of this
wave table to the PWM generator to create different frequency sine
waves, as illustrated in
Figure 10
. For low-cost, open-loop applications,
the input variables to the PWM routine are simply the desired voltage
and frequency to be applied to the motor. The functions shown would
typically exist as an interrupt service routine initiated by a periodic
interrupt from the PWM module. In fact, the PWM module can be
programmed to provide this interrupt at a rate of every one, two, four, or
eight PWM cycles to accommodate the time required to execute the
interrupt routine.
To generate a 3-phase output, the data for phase one is fetched from the
wave table at a location corresponding to the pointer position calculated
by the integrator. A value is then added to the pointer, resulting in a shift
of 120 degrees (85.33 points for a single-cycle table of 256 points), and
the data for phase two is indexed. If the pointer is incremented to an
Figure 10. PWM Generation Technique
1000
1050
F
θ
INTEGRATOR
SINE TABLE POINTER
X
X
X
WAVEFORMTABLE
V
INPUTS
TO
ISR
PWM1 VALUE REGISTER
PWM5 VALUE REGISTER
PWM3 VALUE REGISTER
0
50
100
150
200
250
0
200
400
600
800
–26
S4
WAVE (
θ
)
WAVE (
θ
+ 2
π
/3)
WAVE (
θ
+ 4
π
/3)
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MC68HC708MP16CFU 制造商:MAJOR 功能描述:
MC68HC711D3CFBE2 制造商:Freescale Semiconductor 功能描述:
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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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