SIM225 Technical Reference Manual
16
© Serious Integrated, Inc.
SIM225_TRM_A1ENUS
Revision A1
HARDWARE OVERVIEW
SIM225 Hardware Block Diagram
*options depend on family member
Not all features are available on all SIM225 family members.
HIGH PERFORMANCE RENESAS RX MCU
The heart of the SIM225 is the 32-bit Renesas
RX63N/RX631
microcontroller (MCU) with up to 2MB of
zero wait state FLASH, 128KB RAM, and FPU. This powerful MCU is equipped with extensive analog and
digital peripherals and, with software, can deliver an excellent user interface experience. On the SIM225,
the MCU should be operated at 96MHz to ensure usable timing sources for peripherals such as USB.
GRAPHIC COLOR LCD DISPLAY WITH DIRECT DRIVE AND TOUCH OPTION
The SIM225’s Liquid Crystal Display (“LCD” or “glass”) has an on-glass row-column driver chip for
illuminating pixels but has no on-glass frame buffer or memory. The pixel data must be delivered at
approximately 60Hz per complete frame by the MCU, and stored and managed in the SDRAM attached to
the MCU. The RX631/63N MCU family has no hardware graphics engine, but rather implements a “Direct
Drive” architecture whereby the MCU’s DMA, timers, and other peripherals are used to deliver pixel data
directly from SDRAM to the LCD at the specific timing required by the LCD. The performance of the RX
MCU can enable surprising GUI performance and the Direct Drive architecture on the RX requires few
external components. This combination can yield a modern-looking GUI, including alpha blending effects,
with low system cost.
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