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參數(shù)資料
型號(hào)： MC68HC11K4VFU3
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： Technical Summary 8-Bit Microcontroller
中文描述： 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQFP80
封裝： QFP-80
文件頁(yè)數(shù)： 74/80頁(yè)
文件大?。?/td> 420K
代理商： MC68HC11K4VFU3
MOTOROLA
74
M68HC11 K Series
MC68HC11TS/D
12 Pulse-Width Modulation Timer
M68HC11 K-series MCUs contains a PWM timer that is composed of a four-channel 8-bit modulator.
Each of the modulators can create independent continuous waveforms with software-selectable duty
rates from 0% to 100%.
The PWM provides up to four pulse-width modulated waveforms on port H pins. Each channel has its
own counter. Pairs of counters can be concatenated to create 16-bit PWM outputs based on 16-bit
counts. Three clock sources (A, B, and S) and a flexible clock select scheme give the PWM system a
wide range of frequencies.
Four control registers configure the PWM outputs —PWCLK, PWPOL, PWSCAL, and PWEN. The PW-
CLK register selects the prescale value for the PWM clock sources and enables the 16-bit PWM func-
tions. The PWPOL register determines each channel's polarity and selects the clock source for each
channel. The PWSCAL register derives a user-scaled clock based on the A clock source, and the
PWEN register enables the PWM channels.
Each channel has a separate 8-bit counter, period register, and duty cycle register. The period and duty
cycle registers are double buffered so that if they are changed while the channel is enabled, the change
does not take effect until the counter rolls over or the channel is disabled. A new period or duty cycle
can be forced into effect immediately by writing to the period or duty cycle register and then writing to
the counter.
With channels configured for 8-bit mode and E = 4 MHz, PWM signals of 40 kHz (1% duty cycle reso-
lution) to less than 10 Hz (approximately 0.4% duty cycle resolution) can be produced. By configuring
the channels for 16-bit mode with E = 4 MHz, PWM periods greater than one minute are possible.
In 16-bit mode, duty cycle resolution of almost 15 parts per million can be achieved (at a PWM frequen-
cy of about 60 Hz). In the same system, a PWM frequency of 1 kHz corresponds to a duty cycle reso-
lution of 0.025%.
相關(guān)PDF資料
PDF描述
MC68HC11K1VFU4 8-BIT MICROCONTROLLER
MC68HC11K4VFU4 Technical Summary 8-Bit Microcontroller
MC68HC11K4VFN2 Technical Summary 8-Bit Microcontroller
MC68HC11K1CFN2 8-BIT MICROCONTROLLER
MC68HC11K1MFN2 8-BIT MICROCONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC11K4VFU4 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT
MC68HC11KA0 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:CONFIG Register Programming for EEPROM-based M68HC11 Microcontrollers
MC68HC11KA0CFN2 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
MC68HC11KA0CFN3 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
MC68HC11KA0CFN4 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
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