Renesas devices offer up to 1Mb of on-chip SRAM

The SH7264 and the SH7262 have been designed for visualisation and graphical-user-interface (GUI) applications and offer up to 1Mb of on-chip SRAM.

This allows video display capabilities to be implemented without the need for external RAM, thereby offering significant reductions in overall system costs and power consumption.

The company claims that, as integrated solutions, the SH7262 and the SH7264 offer many advantages over traditional two-chip (RAM and MPU) solutions, including printed-circuit-board (PCB) space saving, EMC improvement and yield enhancement.

They also remove the need for an external SRAM.

The devices can boot directly from serial flash, which means that the total BOM cost can be cut by switching from a standard NOR flash on an external bus controller to a simple serial flash device on an SPI, with the program code being loaded onto the internal SRAM.

The SH7262 and the SH7264 include a 144MHz superscalar central-processing-unit (CPU) core, achieving more than 345DMIPS, and a floating point unit (FPU).

In addition to the 1Mb of internal SRAM, the device also contains 64Kb of user RAM for data manipulation and 16Kb of cache memory to ensure optimum performance.

The video display controller (VDC) includes hardware support for alpha blending, chroma-keying and driving a TFT screen, up to VGA size (480 x 420 pixels).

The SRAM capacity makes it possible to use displays without the need for external SDRAM as video memory, making this a suitable solution for mid-range displays.

To aid with communication, the SH7264 and the SH7262 include eight channels of UART, three IIC channels, two CAN*2 channels and a high-speed USB peripheral supporting both Host and Function modes.

Supporting the idea of low cost, enabling system designers to use a PCB without many layers, the SH7262 comes in a 176-pin QFP with a 0.5mm pitch and the SH7264 comes in a 208-pin QFP also with a 0.5mm pitch.