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MCUs enable VGA display without external SDRAM

Posted: 10 Nov 2009     Print Version  Bookmark and Share

Keywords:microcontroller  32bit MCU  SRAM  NAND flash 

Ensuring compatibility
The SH7266 and SH7267 are built around the SH2A-FPU CPU core (which incorporates an FPU), have a maximum operating frequency of 144MHz, and deliver excellent processing performance. The instruction set of the SH2A-FPU is backward compatible with the SH-2A and SH-2 CPU cores, allowing developers to reuse program code created for earlier products. In addition, ROM code efficiency has been improved approximately 75 percent in comparison with the SH-2. As a result, the object code for the same program can be compressed to about three-quarters the previous size, conserving the memory capacity available for storing programs.

In addition to NOR flash memory, the SH7266 and SH7267 allow connection of other external flash memory types such as NAND flash memory and serial flash memory. The device can be booted from a program read in from the external flash memory. These microcontrollers are thus excellent solutions for systems employing many different types of flash memory.

Hi-Speed USB2.0 (host and function modes) is implemented on-chip. When host mode is selected the device can connect to and communicate with multiple peripheral devices via a hub. Switching between the host and function modes is easily accomplished by register settings. The USB has a built-in USB transceiver that supports all data transfer types defined in the USB standard.

A CD-ROM decoder and a sampling rate converter for converting the sampling frequency for audio data are implemented on-chip. These functions are required by digital audio devices. Other on-chip peripheral functions suitable for a variety of applications include a Renesas SPDIF interface, a direct memory access controller, and a SD memory card interface.

These many on-chip peripheral functions enable developers to build systems delivering advanced functionality with a smaller number of total components. This contributes to reduced overall system cost.

The SH7266 and SH7267 are each available in four product versions with different combinations of CAN interface and IEBus interface availability, for a total of eight product versions. Additionally, each product version is available with an operating temperature range of either -40°C to 85°C or -20°C to 85°C, resulting in a total lineup of 16 product numbers. Customers can select the product version that best meets their requirements.

The SH7266 comes in a lead-free 144-pin QFP package and the SH7267 in a Pb-free 176-pin QFP package. Both have an on-chip debugging function that enables real-time debugging at the maximum operating frequency. The E10A-USB emulator, which uses USB bus power and requires no external power supply, is available as a development environment.

Renesas also supplies middleware with support for digital audio compression standards such as MP3, WMA and AAC. In addition, software is available that provides support for the ISO 9660 file system used by CD-ROM drives, the FAT32 file system used by hard disk drives, USB mass storage class drivers, and others. The available software libraries support devices requiring storage and communication capabilities, such as USB functionality for digital audio devices or embedded applications.

Sample shipments of the SH7266 and SH7267 will begin in February 2010 in Japan.

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