For HT46 series MCUs, how to adjust the PWM frequency on port D?
Holtek Semiconductor - Cost-Effective A/D Type MCU SeriesFor HT46 series MCUs, the PWM frequency is derived by calculating fsys/256, in other words, once the system clock is selected, the PWM frequency is therefore fixed. Users can only adjust the PWM duty through the PWM register.
Can the I/O pins on the HT46 series of MCUs be used as LCD drive pins?
Holtek Semiconductor - Cost-Effective A/D Type MCU SeriesThe pins on the HT46 series can be setup as either CMOS outputs or Schmitt trigger inputs, therefore they can be setup in three conditions which are, a high level output, a low level and as an input. By using an externally connected resistor divider on an I/O pin, when setup as an input, a voltage of VDD/2 can be generated. In this way a 3 common LCD configuration can be generated.
What does PWM frequency mean?
Castle Creations - FAQsPWM stands for Pulse Width Modulation. The speed controller uses PWM to control the power going to the motor. The controller breaks the current going to the motor into separate pulses that occur about 13,000 times per second. The percentage of the pulse that is on power compared to the part of the pulse that is off power determines how much power the motor sees. An oversimplified example is that if 50% of the pulse is on and 50% is off, the motor sees 50% power.
What is the PWM frequency and max. Controller frequency ?
B L M C - SoftwareThe PWM has a period of 100?s that makes a frequency of 10kHz. The conroller runs with 8MHz. 100?s makes it all very easy: the rc-puls from 1100?s to 1900?s is evaluated and the range (800) than shifted right 3 times means divided by 8 - makes 100 and is directly used for PWM. Timer0 is set to 1?s and has only to generate the PWM and to evaluate the PWM state.
How is the HT46 MCU A/D Converter setup?
Holtek Semiconductor - Cost-Effective A/D Type MCU SeriesSelect the channel for A/D conversion by setting ACS2, ACS1 and ACS0. Note the channel selected should be configured in the previous step. Set ADCR.7=0 -->1-->0 to start the A/D conversion, EOCB=1 indicating A/D conversion is in process. Wait 76 TAD periods to complete the A/D conversion, EOCB=0 indicating the end of A/D conversion and interrupt request flag ADF=1
How can I adjust the frequency of breaks?
Using RSIGuard FAQTo adjust break frequency, click on the Setup menu, select Settings, and click on the BreakTimer tab. There are several settings that allow you to adjust break frequency. To get started, please see the BreakTimer settings documentation. Here are some additional tips: Adjust the top two sliders to adjust how often breaks occur. As you adjust the sliders, you can watch the effect it has on the "Average time between breaks" value.
What is Roboteq's controller PWM frequency?
Roboteq Frequently Asked QuestionsRoboteq's controller PWM frequency is 16 kHz This means that the variable on-off cycle will repeat every 64 microseconds. 16 kHz is a high frequency value for PWM control that will result in smoother and more energy efficient motor operation than at lower frequencies. The use of high PWM frequency will also result in silent motor operation.
What is PWM?
FAQsPWM stands for Pulse Width Modulation. Most modern power control is done using mosfets, which are high speed switches. PWM is a method for varying the output power by switching the output to full power for a very short period and then off. This is performed over and over at high frequency, usually from about 1 kHz (1000 times per second) up to around 100 kHz (100,000 time per second). The power is varied by changing the ratio of on time to off time.
What is the PWM frequency under (6+2) mode and (7+1) mode?
Holtek Semiconductor - Cost-Effective A/D Type MCU SeriesFor PWM (6+2) mode, the PWM cycle is divided into 4 modulation cycles. Each modulation cycle has 64 PWM input clock periods, and the PWM frequency will be fSYS/26. For PWM (7+1) mode, the PWM cycle is divided into 2 modulation cycles. Each modulation cycle has 128 PWM input clock periods, and the PWM frequency will be fSYS/27. In comparison with the 8-bit mode, the (6+2) Mode PWM frequency is 4 times higher and (7+1) mode is 2 times higher than that of the 8-bit mode.
What is the operating frequency of the HT48 I/O type MCUs?
Holtek Semiconductor - I/O Type MCU Series FAQsFor 5V/3.3V or 3-cell battery applications, the maximum operating frequency is 8MHz (3.3V). For 3V or 2-cell battery applications the maximum operating frequency is 4MHz (2.2V).
Can the HT48 series of MCUs be used to implement an LCD driver?
Holtek Semiconductor - I/O Type MCU Series FAQsYes they can, but the implementation will be limited to 1/2 bias with pull-high and pull low resistors connected to the I/O pin. Three different voltage levels can then be obtained by setting up the pin as an output and setting it high, setting up the pin as an input, and setting up the pin as an output and setting it low.
Are there are limitations on using the I/O pins of the HT48 series MCUs to drive an LCD?
Holtek Semiconductor - I/O Type MCU Series FAQsBecause the I/O pins can only generate three voltage levels, namely, VDD, VDD/2 and GND voltages, therefore only 1/2 bias LCD panels can be driven. For LCD panels that require other Bias types, it is not possible to use the I/Os.
How do I adjust the frequency for an external monitor (projector)?
Biology Computer ProjectorsSome people have had problems hooking up Mac laptops to projectors at other institutions (where, often, the support people know nothing about Macs). It is sometimes suggested to try reducing the frequency of the monitor output. If you just use the control strip widget, only the "Recommended" settings for an external monitor will be shown. You need to open the Monitors control panel while the external monitor or projector is attached.
Can I adjust myself?
Chiropractic Frequently Asked QuestionsNo. Since a chiropractic adjustment is a specific force, applied in a specific direction to a specific joint, it is virtually impossible to adjust oneself correctly and accurately. It is possible to turn or bend or twist in certain ways to create a "popping" sound that sometimes accompanies a chiropractic adjustment. Unfortunately, this type of joint manipulation is usually counterproductive, often making an already unstable spine even more unstable, and can sometimes be dangerous.
