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FAQ / Is the NuMicro® family chip provided with an internal LDO (Low Dropout Regulator) to supply 3.3V to a USB transceiver?
https://www.nuvoton.com.cn/support/technical-support/faq/d5b2ddcd-04f1-11ea-b113-05daf7eedf03/
Is the NuMicro® family chip provided with an internal LDO (Low Dropout Regulator) to supply 3.3V to a USB transceiver? 1441790979574 Some NuMicro® family series that support USB function are provided with the internal LDO which can convert 5V input voltage of VBUS into 3.3V output voltage and supply the 3.3V to a USB transceiver. When the USB function is used, the LDO output pin VDD33 needs to connect to the LDO output voltage having a stable capacitor. Also, the capacitor needs to be close to the VDD33 pin. According to different NuMicro® Family series, the value of an external capacitor for VDD33 may be different. Please refer to the following table: NuMicro® Family Series Minimum Value of an External Capacitor NUC120 Series 1 uF NUC140 Series 1 uF NUC122 Series 1 uF NUC123 Series 1 uF NUC220 Series 1 uF NUC240 Series 1 uF Nano120/130 Series 1 uF NUC442/472 Series 10 uF M452/453 Series 1 uF NUC505 Series Do not have LDO for USB. In consideration of chip operational stability, it is
FAQ / What is the advantage of Hardware divider (HDIV)? Which series in the NuMicro® Family can support HDIV?
https://www.nuvoton.com.cn/support/technical-support/faq/d5bc53b0-04f1-11ea-b113-05daf7eedf03/
Hardware Divider, HDIV What is the advantage of Hardware divider (HDIV)? Which series in the NuMicro® Family can support HDIV? 1439458380000 The hardware divider (HDIV) can use hardware circuit to perform division operation directly. Software is not required to translate division instructions into a large number of alternative operation instructions. In the applications requiring high degree of numerical computation, such as sensor value reading/writing and analysis, the HDIV can increase the computing capacity of the CPU and reduce the operation time. In the NuMicro® Family, the series embedded with Cortex®-M4 core are equipped with Arithmetic Logic Unit (ALU) that supports hardware division, which supports SDIV and UDIV instructions for 32-bit Signed and Unsigned division operation. Depending on the numeral of the dividend and the divisor, the operation can be completed in 2 to 12 HCLK cycles. Since the Arithmetic Logic Unit (ALU) in the Cortex®-M0 core does not support hardware
FAQ / What is the Bit-banding feature? How to use it?
https://www.nuvoton.com.cn/support/technical-support/faq/d5ecb298-04f1-11ea-b113-05daf7eedf03/
What is the Bit-banding feature? How to use it? 1446449640000 Bit-banding is a feature supported by the Cortex®-M4 core. The NuMicro® family M4 series, such as M451 series, NUC442/472 series, and NUC505 series, all support the bit-Banding feature. The Bit-banding feature allows a bit in a bit-band region mapped to a word in an alias region, as shown below. If there is a need to modify a bit, the user only needs to modify the corresponding word to complete the bit setting. With the bit-banding feature, SRAM or peripheral registers can be mapped to the respective alias region. Through the modification of words in the alias region, the user will be able to complete bit setting for SRAM or peripheral registers without complicated setup process, thereby increasing the efficiency of bit setting. Bit-banding address is calculated as follows: bit_word_addr = bit_band_base + (byte_offset x 32) + (bit_number × 4) bit_band_base is a starting address of the alias region, byte_offset is a word
트레이드 쇼 / Nuvoton to Unveil Latest Cortex™- M NuMicro™ Family @ Embedded World 2015 in Germany
https://www.nuvoton.com.cn/news/events/tradeshow/TSNuvotonEvent-000108/
SalesSupport@nuvoton.com
Nuvoton to Unveil Latest Cortex™- M NuMicro™ Family @ Embedded World 2015 in Germany
4A-527
Nuvoton
트레이드 쇼 / Nuvoton is sharing the Joy of Innovation at Embedded World 2016 in Germany
https://www.nuvoton.com.cn/news/events/tradeshow/TSNuvotonEvent-000123/
SalesSupport@nuvoton.com
Nuvoton is sharing the Joy of Innovation at Embedded World 2016 in Germany
4A-527
Nuvoton
NUC505 시리즈 / Example Code
https://www.nuvoton.com.cn/products/microcontrollers/arm-cortex-m4-mcus/nuc505-series/?tab=2&group=Software&rt=Example Code
/resource-files/EC_NUC505_WavPlayerSPIFlash_V1.00.zip SPI_NUC505_Wav Player SPI Flash EC0120180913134708
FAQ / How much capacitor can VBUS use when using the USB function?
https://www.nuvoton.com.cn/support/technical-support/faq/d79b4cf1-04f1-11ea-b113-05daf7eedf03/
How much capacitor can VBUS use when using the USB function? 1493184411318 The VBUS capacitors need to comply with the USB-IF specification inrush current. For USB 2.0, the USB-IF defined that inrush current could not exceed 50 uC. Therefore, if the VBUS normal voltage is 5.0V (Q = CV), the VBUS capacitor shall not exceed 10 uF. Users need to design their own circuit, and adjust the VBUS capacitor. With the USB analysis tool USBET20 provided by USB-IF, user can see if the VBUS capacitor conforms to the USB-IF specification.
FAQ / What to pay attention to when operating the M451 full-duplex SPI?
https://www.nuvoton.com.cn/support/technical-support/faq/d8253da4-04f1-11ea-b113-05daf7eedf03/
SPI, full duplex, half duplex What to pay attention to when operating the M451 full-duplex SPI? 1516005881242 The NuMicro® M451 SPI supports full-duplex mode, which transmits (receives) data as well as receives (transmits) data, thus improving the SPI transmission efficiency. Therefore, before receiving data, user must first empty the SPI RX FIFO to avoid receiving unexpected data. In the code, user must first call SPI_ClearRxFIFO (SPIn), and then receive SPI RX data. The reference code is located in the following path: M451SeriesBSP_v3.01.001\SampleCode\NuEdu\ Smpl_Basic01_SPI_Flash_w_PDMA In the sample code of the NuEdu-Basic01_SPI_Flash_w_PDMA.c, user first clears the RX FIFO data in the 330th row and then triggers the RX receive data, as shown below.
FAQ / How to increase the number of devices supported when connecting to an external USB hub?
https://www.nuvoton.com.cn/support/technical-support/faq/d82a94d7-04f1-11ea-b113-05daf7eedf03/
Endpoint, USB, Hub How to increase the number of devices supported when connecting to an external USB hub? 1516007096437 Please increase the values of the DEV_MAX_NUM, ED_MAX_NUM and MAX_HUB_DEVICE in usbh_config.h, as shown below.
FAQ / Can USB clock source be used for the internal high-speed RC oscillator (HIRC)?
https://www.nuvoton.com.cn/support/technical-support/faq/d437afa5-04f1-11ea-b113-05daf7eedf03/
Can USB clock source be used for the internal high-speed RC oscillator (HIRC)? 1423564121487 The NuMicro® Nano120 /130 series can use an external low-speed oscillator (LXT) to ensure the accuracy HIRC of to 0.25%, which is compliant with the USB specification. The other NuMicro® series need to use an external oscillator as the USB clock source.
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