Processor

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A processor or central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logical, control and input/output (I/O) operations specified by the instructions.

See also:

Trezor ONE

ARM Cortex-M3 processor @ 120 MHz

The Cortex-M3 processor is used for high-performance platforms for a broad range of devices including microcontrollers, automotive body systems, industrial control systems and wireless networking and sensors.

See also this GitHub page.

Trezor T

ARM Cortex-M4 processor @ 168 Mhz

The Cortex-M4 processor main advantage is the combination of high-efficiency signal processing functionality with the low-power, low cost and ease-of-use. It is mainly used in automotive, power management, embedded audio and industrial automation markets.

See also this GitHub page.