Renesas has introduced its first low-end Flash microcontrollers (MCUs) with a built-in Universal Serial Bus 2.0 (USB) host/function controller, designed for consumer electronics such as PC peripherals, mobile devices and healthcare equipment. The new MCU products are part of the R8C family, and include the R8C/34K and R8C/3MK groups, which incorporate a USB host/function controller, and the R8C/34U and R8C/3MU groups with a USB function-only controller.
In the R8C/34K, the USB peripheral can also be configured for On-the-Go (OTG) functionality to provide greater flexibility and simplify system design. The new devices offer variants ranging from 32 to 128 KB with up to 10 KB of SRAM, and 4 KB of data Flash for data storage, and are offered in a 7 x 7 mm or 6 x 6 mm package.
The USB controller conforms to the USB 2.0 Full-Speed (12 Mbps) specifications, and consists of five flexible communication pipes, each one including its own FIFO memory (for a total of 448 Bytes). Thus, applications can select double or single buffering and the communication direction according to the needs of the system application in software. When this USB controller is used as a host, it can achieve highly efficient USB communication by automatically repeating transfers using the free time in the USB frame. Also, since the transfer scheduling is performed in hardware, the CPU load is reduced.
When the USB controller is used as a USB function controller, it performs the state management required for USB communication and the control transfer stage management in hardware. This means that communication with a USB host can be implemented with even simpler software. Since the controller includes a USB power supply regulator, a single-voltage power supply (3,0 to 5,5 V) provided by the USB cable can be utilised.
The new MCUs provide both wait mode and stop mode to reduce power consumption. Furthermore, the internal PLL circuit for the USB clock can be disabled when the USB is not required, to reduce power consumption further.
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