參數(shù)資料
型號： MC68HC705V8CFU
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP64
封裝： QFP-64
文件頁數(shù)： 170/172頁
文件大?。?/td> 890K
代理商： MC68HC705V8CFU
MOTOROLA
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
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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