Linked by David Adams on Tue 13th Mar 2012 16:17 UTC
Hardware, Embedded Systems The Cortex -M0+ architecture is designed to provide chip-makers with the means to build microcontrollers that require "ultra low power" but are capable of 32-bit processing. Arm says it went back to the drawing board to create the new processor cores which measure 1mm by 1mm in size. It says the microcontrollers should draw around a third less energy than their predecessors, which only offered 8 and 16-bit capabilities.
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Indeed - most modern chips are pad-limited not logic-limited. With the current standard BGA fine pitch (0.4 mm) you would have at most 9 bumps on 1x1mm which is hardly useful for a 32 bit uC.

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