Cypress Semiconductor's PSoC (Programmable System on Chip) microcontrollers have been around for a long time using propriatery 8-bit cores (PSoC 1) or 8051 cores (PSoC 2). More recently Cypress has extended the range with PSoC 4 and PSoC 5 based respectively on 32-Bit ARM Cortex M0 and Cortex M3 cores.
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