FPB-R9A02G021 RISC-V MCUファストプロトタイピングボード

AI生成コンテンツ: The RISC-V A/D converter operates in scan mode to convert analog signals from pins ANI2, ANI3, ANI4, and ANI5 into 12-bit digital values stored in on-chip RAM. It uses sequential conversion triggered by software without wait, with a conversion time of 5.375 µs. The converter runs at 48 MHz on a 3.3 V supply and supports voltage references from Vcc to Vss. Sample code and hardware configuration details enable practical implementation and testing on RISC-V microcontrollers, specifically the R9A02G021 device and the RISC-V-48p Fast Prototyping Board. Development uses e2studio with LLVM compiler and Smart Configurator tools.

AI生成コンテンツ: Flash read protection disables read access to specified code flash areas while allowing CPU instruction fetch. Setting protection involves configuring start and end addresses in flash read protection registers, which are option-setting memory within code flash. Reading from protected areas returns 00H. Protection can be released by erasing the code flash. Debugging is disabled in protected areas unless protection is disabled. Programs can be placed in protected areas via linker script section settings, and functions within these areas can be called normally.

AI生成コンテンツ: The document explains how to use the fixed-cycle interrupt and alarm interrupt functions of a realtime clock (RTC) on a RISC-V microcontroller. It details setting the RTC time, configuring interrupts to toggle output ports and control LEDs, and displaying the clock on an LCD via I2C communication. The fixed-cycle interrupt toggles an output every 0.5 seconds, while the alarm interrupt triggers an LED five seconds after the set alarm time. Initialization steps for the RTC, I/O ports, serial interface, and LCD module are provided along with sample code and flowcharts for implementation.

AI生成コンテンツ: Frequency detection compares the high-speed on-chip oscillator clock (HOCO) and the low-speed on-chip oscillator clock (32.768 kHz) to detect abnormal clock frequencies. It measures pulse intervals using timer array unit 0 (TAU0), with HOCO as the count clock and the low-speed clock as the timer input. If the measured pulse interval falls outside a defined range, an LED blinks to indicate abnormal frequency; otherwise, the LED remains off. The count clock frequency can be switched dynamically via an external interrupt, with LED indicators reflecting the current clock state. The process involves initializing TAU0, measuring pulse intervals, entering Sleep mode, and handling interrupts to evaluate frequency status and switch clock settings as needed.

AI生成コンテンツ: The document explains methods to protect third-party software IP on RISC-V MCUs using memory protection and startup control functions. It details flash read protection to prevent unauthorized reading or copying of software stored in designated memory areas. Unique ID and User ID mechanisms restrict software execution to authorized devices by linking software licenses to specific MCU IDs. These security features help prevent unauthorized use, duplication, and analysis of valuable software IP. The document also covers practical setup procedures for these protections.

AI生成コンテンツ: The document explains the operation and setup of three voltage detection circuits (LVD0, LVD1, and LVD2) integrated into the RISC-V microcontroller. LVD0 monitors supply voltage against a set threshold to generate internal resets during voltage fluctuations, ensuring stable operation. LVD1 and LVD2 provide reset or interrupt signals based on voltage detection, with configurable detection voltages and modes. The note details register settings, activation procedures, and timing requirements to maintain microcontroller stability during power supply changes, emphasizing proper reset handling during voltage rise and fall.