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MCUs offer USB host/function, OTG support

Posted: 10 Dec 2010 ?? ?Print Version ?Bookmark and Share

Keywords:R8C? microcontroller? MCU?

R8C MCUsRenesas Electronics Corp. has introduced its first low-end flash microcontrollers with a built-in USB 2.0 host/function controller, designed for consumer electronics, such as PC peripherals, mobile devices, and healthcare equipment. The MCUs 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 group, the USB peripheral can be configured for OTG functionality. The devices offer variants ranging from 32KB to 128KB with up to 10KB of SRAM, and 4KB of data Flash for data storage.

The USB controller conforms to the USB 2.0 full speed (12Mbit/s) specifications. Furthermore, the controller consists of five high-performance and flexible communication pipes, and each pipe includes its own FIFO memory (for a total of 448B). 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 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 this 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 this USB controller includes a USB

power supply regulator, a single-voltage power supply (3V to 5.5V) provided by the USB cable can be utilized.

The R8C/34K group products allow the USB host and USB function operations to be switched with register settings and can also support USB OTG.

The new MCUs provide both wait mode and stop mode, which significantly reduce power consumption. Furthermore, the internal PLL circuit for the USB clock can be disabled when the USB is not required to reduce the power consumption.

The R8C/34K and R8C/34U group devices, and the R8C/3MK and R8C/3MU

group MCUs come in a 7mm-by-7mm 48-pin LQFP package and a 6mm-by-6mm 40-pin QFN package,


The sample prices vary depending on memory capacity and package. For instance, the R5F2134CKNFP MCU with 128KB of Flash memory and 10KB of RAM in a 48-pin LQFP package is priced at $6 per unit. Mass production is scheduled in March 2011 and is expected to reach a combined volume of 500,000 units per month by March 2012.

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