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)： 6/44頁(yè)
文件大小： 342K
代理商： MC68HC708MP16
Application Note
AN1712
6
MOTOROLA
Figure 3. PWM Waveform Types
The counter in the PWM module counts from $000 hex to the value
specified in the PWM counter modulo register (up to $FFF maximum),
where each counter "tick" can be as fine as 125 ns for an 8-MHz bus.
The PWM x VALUE registers each hold a 16-bit value partitioned as an
upper byte and lower byte. As long as bit 15 of this value is clear
(indicating a positive number), the number is compared to the counter
value to generate the desired pulse width. Any value greater than or
equal to the counter modulus will result in a PWM signal with a full 100%
duty cycle. However, if bit 15 is set (indicating a negative number), the
value will instead be treated as 0, resulting in a duty cycle of 0%. That's
right. Zero. Zip. Nada! This automatic "saturation mode" of operation
permits overmodulation of the motor waveform which might result from
small finite word length errors, guaranteeing rail-to-rail operation without
having to deal with modulo wraparound at 0. Otherwise, the software
would have to check each PWM value and branch if it was less than 0 to
load a 0 value instead. This mode of operation can be compared to the
way an op-amp output works when you overdrive its input. It just
saturates instead of driving to the other rail.
EDGE ALIGNED
CENTER ALIGNED
ALIGNMENT
REFERENCE
MODULUS = 16
MODULUS = 8
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