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FAQ / 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.)
FAQ / 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.
FAQ / 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.
FAQ / 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.
FAQ / 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.
FAQ / 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.
FAQ / What is the pull-up resistor value for I2C bus?
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What is the pull-up resistor value for I2C bus? 1429753560000 For the standard-mode I2C-bus system, the resistor value Rp in the figure above is determined by the following parameters: I2C speed; Supply voltage; Bus capacitance; The number of connected devices (input current + leakage current). The supply voltage (VDD) and the maximum output LOW level determine the minimum value of pull-up resistor Rp. For example, a supply voltage of 4.5V, VOL= 0.4 V and Rp is 4.7 kΩ. ( 4.5 - 0.45 ) / 4700 = 8.617 mA < Sink current. The maximum bus capacitance of the value Rp limits is approximately 400 pf (capacitive load), calculated by cut-off frequency (1/2 * pi * Rp * Cb), to meet the requirement that the maximum tr (SCL/SDA rising time) is 300 ns.
FAQ / What needs to be noted when using GPIO interrupt wake-up?
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What needs to be noted when using GPIO interrupt wake-up? 1427852760000 The user must confirm I/O state based on the pre-determined trigger condition before entering Idle or Power-down mode. For example, if the interrupt trigger condition is rising-edge or high level, the user must confirm if the I/O state before entering Idle or Power-down mode is low level. Conversely, if the interrupt trigger condition is falling-edge or low level, the user must confirm if the I/O state before entering Idle or Power-down mode is high level.
FAQ / What real-time operating systems (RTOS) do NuMicro™ Cortex-M series chips support?
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What real-time operating systems (RTOS) do NuMicro™ Cortex-M series chips support? 1427853480000 The real-time operating systems supported by the NuMicro™ Cortex-M series include FreeRTOS, uC/OS-II, Keil RTX and IAR PowerPAC RTOS.
FAQ / What interfaces does In System Programming (ISP) tool support for system upgrades?
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What interfaces does In System Programming (ISP) tool support for system upgrades? 1427853480000 The ISP tool supports many interfaces for system upgrades, including UART, USB, I2C, SPI, CAN, RS485, I/O and Ethernet, and provides open source code for users to modify to conform to their own system environment.
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