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HC705V8GRS/D Datasheet(PDF) 97 Page - NXP Semiconductors |
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HC705V8GRS/D Datasheet(HTML) 97 Page - NXP Semiconductors |
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97 / 172 page  SECTION 13: PULSE WIDTH MODULATOR Page 86 MC68HC705V8 Specification Rev. 2.1 When the PWM subsystem is enabled, a write to the PWM Data Register will not become effective until the end of the current PWM period has occurred, at which time the new data value is loaded into the PWM Data Register. However, should a write to the registers be performed when the PWM subsystem is disabled, the data is transferred immediately. All Registers are updated after the PWM Data Register is written to and the end of a PWM cycle occurs. The PWM output can have an active high or an active low pulse under software control using the POL (polarity) bit as shown in Figure 13-2 and Figure 13-3. Figure 13-2: PWM Waveform Examples (POL = 1) Figure 13-3: PWM Waveform Examples (POL = 0) 13.2 REGISTERS Associated with the PWM system, there is a PWM data register and a control register. The following registers can be written to and read at any time. Data written to the data register is held in a buffer and transferred to the PWM Data Register at the end of a PWM cycle. $05 $3F $1F PWM register = $x0 T $05 $1F PWM register = $x0 T $3F Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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