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參數(shù)資料
| 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)： | 23/44頁 |
| 文件大?。?/td> | 342K |
| 代理商： | MC68HC708MP16 |
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Application Note
Application Examples
AN1712
MOTOROLA
23
address beyond the end of the table, take care to ensure that the pointer
wraps to the beginning of the table. This will be handled automatically by
the modulo arithmetic associated with the pointer increment if the
number of entries in the wave table is sized to match the pointer word
length. Phase three data is obtained by a further 120-degree increment
of the pointer.
This technique supports bidirectional motor operation by controlling the
sign of the frequency variable. Negative frequencies result in reverse
shaft rotation, and the pointer simply is decremented by the integrator
instead of incremented. Again, if the wave table is sized to match the
pointer wordlength, the modulo arithmetic automatically will handle the
required wrap-around when the pointer is decremented beyond the
beginning of the table.
Code has been written for the 'MP16 which executes the functions
shown in
Figure 10
in 33
μ
s for an 8-MHz bus. To put this in perspective,
the 'MP16 could generate 10-kHz PWMs for a 3-phase motor, updating
all the PWM values at the start of each new PWM cycle, and still have
66% CPU bandwidth remaining for other tasks.
Since AC motor control is the target application of the 'MP16, one can
reasonably expect that the part is ideally suited to this task. A typical
hardware configuration is shown in
Figure 11
. The DISMAP register
retains its default value of $FF, which allows a fault condition on any of
the fault inputs to disable all the PWM outputs. All fault inputs are
programmed to work in manual mode, and the current fault uses the
fault2 input, which means the software must acknowledge the fault and
it must go away before the PWMs can be reactivated. The temperature
and bus voltage faults are returned to the odd-numbered fault pins,
which implies that the fault still can be asserted when software
reactivates the PWMs. This permits these signals to have long time
constants and/or hysteresis.
Since each of the six inverter transistors is driven with a unique PWM
signal, the full advantages of center-aligned operation can be realized.
Also, complementary mode should be specified and a dead-time value
written to the dead-time register before the PWMs are enabled.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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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 |
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