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よくあるご質問 / How to generate a 9-bit data frame with the UART function?
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UART 9 Bit How to generate a 9-bit data frame with the UART function? 1423647253623 A 9-bit data frame in the UART application includes 8-bit data and parity bit (9th bit), and is normally used in the RS485 application to indicate the address or data byte. Refer to (follow) the table below to control SPE bit, EPE bit, and PBE bit of UA_LCR register for parity bit (9th bit) level first, and then write 8-bit data into the UA_THR register to generate a 9-bit data frame after UART is initiated. SPE EPE PBE Parity Bit Level 1 1 1 0 1 0 1 1
よくあるご質問 / How to configure the USB clock source?
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How to configure the USB clock source? 1423816920000 In the USB specification, the transmission rate of low-speed, full-speed and high-speed devices are 1.5 MB, 12 MB and 480 MB respectively. For the NuMicroTM series, some chips support full-speed device, full-speed host and high-speed device. In accordance with the signal sampling method, USB clock source must be set to a multiple of transmission rates. The full-speed device must be set to 4x frequency. Accordingly, the clock source of full-speed device and full-speed host device must be set to 48 MHz. For high-speed devices, the requirement is the frequency needs to be the same. Therefore, the clock source of the high-speed device must be set to 480 MHz. In the NUC123 series, for example, the maximum CPU frequency it can run is 72 MHz. In USB applications, the PLL frequency can be set to 144 MHz so that system can run the highest frequency. When PLL is divided by 2 through CPU and PLL is divided by 3 through USB, the highest system
よくあるご質問 / How to do overcurrent protection and Vbus voltage control in USB host applications?
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How to do overcurrent protection and Vbus voltage control in USB host applications? 1423041180000 In USB host applications, Nuvoton MCUs will not take the initiative to provide 5V voltage to Vbus. Additional 5V needs to be designed for system circuit to provide to USB devices required to be connected. In NuTiny-SDK-M451 development board, for example, 5V is provided by the Nu-Link-Me ICE Debugger end USB. When the USB interface is switched as Host in M451, the use of USB_VBUS_EN OTG pin enables NCT3520U (Nuvoton high-side current-limited switches) to output 5V voltage to Vbus. When the USB interface is switched as Device in M451, OTG will disable the NCT3520U. In addition, NCT3520U provides overcurrent detection. Once the USB_VBUS_ST OTG pin receives an overcurrent signal, the USB_VBUS_EN pin does not need to be set through software, and OTG hardware will take the initiative to set USB_VBUS_EN pin to prohibit 5V voltage output to protect the entire system.
よくあるご質問 / When and how to create a Nu-Link Certificate file (.ICT) with the NuMicro ICP tool?
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When and how to create a Nu-Link Certificate file (.ICT) with the NuMicro ICP tool? 1428572447331 Some customers may complete the production phase through a programming factory in a way of online ICP programming, but they may be unwilling to provide the original .bin or .hex file to the factory. As such, they can create a Nu-Link certificate file through Nuvoton ICP tool binding the exclusive Nu-Link while encrypting the .bin (.hex) file. Using the Nu-Link certificate file in the form of a “project” can avoid the outflow of any products with the same functionality by the programming factory. (Please refer to Chapter 5 in the NuMicro ICP Programmer User Guide for detailed steps.)
よくあるご質問 / In Debug mode under the Keil / IAR development environment, can the user add a new breakpoint immediately during free run of the program?
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Breakpoint In Debug mode under the Keil / IAR development environment, can the user add a new breakpoint immediately during free run of the program? 1426759740000 The Nu-Link driver may add the breakpoint information before full run of the program, and the breakpoints added during full run of the program will be added into the cache. Therefore, the newly added breakpoint can only be executed properly after the user stops and re-executes the program.
よくあるご質問 / What needs to be considered when soldering components in the production process?
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What needs to be considered when soldering components in the production process? 1426812840000 In general, it is suggested to use flux rather than solder paste when soldering components. After soldering is completed, alcohol or cleaning agent can be used to remove residual flux residues to avoid problems caused by a short circuit.
よくあるご質問 / How to not enter interrupt process in Power-down mode after wake-up?
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How to not enter interrupt process in Power-down mode after wake-up? 1427073120000 Before entering Power-down mode, the user can disable IRQ handling by calling the function__disable_irq ();which allows the system to continuously execute the next command when entering Power-down mode after wake-up without entering the interrupt process.In addition, the user also needs to consider the following points: Use the function __ISB (); after the function __WFI to clear commands fetched, so that the subsequent commands can be correctly fetched and executed; Write "1" to NVIC_ICPR to clear the corresponding pending IRQ handlers; Clear the interrupt flag.
よくあるご質問 / How to read ADC conversion results using PDMA?
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How to read ADC conversion results using PDMA? 1429751940000 When A/D conversion is finished, the converted result is loaded into ADDR register and the VALID bit is set to ‘1’. If the PTEN bit in ACDR is set to ‘1’, the ADC controller will generate PDMA request (P_nDRQ) for data transfer. Having the converted result read by PDMA in response to P_nDRQ enables continuous A/D conversion to be achieved without CPU intervention.
よくあるご質問 / How to handle I2C bus hang-up in slave mode?
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How to handle I2C bus hang-up in slave mode? 1426642020000 The I²C controller provides a 14-bit time-out counter to handle I2C bus hang-up. If the I2C bus is hung up, it causes I2CSTATUS and the flag SI not updated for a period, and the 14-bit time-out counter may overflow and acknowledge CPU the I2C interrupt. Refer to the following figure for the 14-bit time-out counter. User may write 1 to clear TIF to 0 and reset I²C. For example, if Pclk is 1 MHz, the time-out value is 1us*214= 16384us.
よくあるご質問 / What is band-gap voltage?
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What is band-gap voltage? 1427851680000 A band-gap internal voltage reference is an external voltage independent voltage reference circuit widely used in integrated circuits. Part Number Band-gap Voltage typical vale MINI51 Series 1. 24 V M051 Series 1.2 0 V NUC1 00/120 Series 1.2 0 V NUC130/140 Series 1.26V NUC230/240 Series 1.25V NUC131 Series 1.25V M0518 Series 1,25V NUC442/472 Series 1.25V M451 Series 1.25V The NANO series can use internal reference voltage 1.8V or 2.5V as band-gap voltage.
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