SH7770
A mysterious SH-4A subtype (one of the first), not intended for mass production. It has an on-chip 2D/3D PowerVR accelerator (MBX), is clocked at 400MHz, has 4-way caches, a 7-stage pipeline, a GPS baseband, and a pair of 32 channel DMA controllers.
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Systems using this CPU subtype
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R77703DRP-1 (SH7770 Highlander CPU module/Izanagi)
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Additional Information
Further information and a brief overview is presented by Renesas here.