NRF52811-QCAA-R datasheet(15/444 Pages) NORDIC

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4 Core components

4.1 CPU

The ARM® Cortex®-M4 processor has a 32-bit instruction set (Thumb®-2 technology) that implements a

superset of 16- and 32-bit instructions to maximize code density and performance.

This processor implements several features that enable energy-efficient arithmetic and high-performance

signal processing including:

• Digital signal processing (DSP) instructions

• Single-cycle multiply and accumulate (MAC) instructions

• Hardware divide

• 8 and 16-bit single instruction multiple data (SIMD) instructions

The ARM Cortex Microcontroller Software Interface Standard (CMSIS) hardware abstraction layer for the

ARM Cortex processor series is implemented and available for the M4 CPU.

Real-time execution is highly deterministic in thread mode, to and from sleep modes, and when handling

events at configurable priority levels via the nested vectored interrupt controller (NVIC).

Executing code from flash will have a wait state penalty on the nRF52 Series. The section Electrical

specification on page 15 shows CPU performance parameters including wait states in different modes,

CPU current and efficiency, and processing power and efficiency based on the CoreMark® benchmark.

The ARM System Timer (SysTick) is present on the device. The SysTick's clock will only tick when the CPU is

running or when the system is in debug interface mode.

4.1.1 Electrical specification

4.1.1.1 CPU performance

The CPU clock speed is 64 MHz. Current and efficiency data is taken when in System ON and the CPU is

executing the CoreMark® benchmark. It includes power regulator and clock base currents. All other blocks

are IDLE.

Symbol

Description

Min.

Typ.

Max.

Units

WFLASH

CPU wait states, running from flash

WRAM

CPU wait states, running from RAM

CMFLASH

CoreMark1, running from flash

144

CoreMark

CMFLASH/MHz

CoreMark per MHz, running from flash

2.25

CoreMark/

MHz

CMFLASH/mA

CoreMark per mA, running from flash, DCDC 3V

CoreMark/

4.1.2 CPU and support module configuration

The ARM® Cortex®-M4 processor has a number of CPU options and support modules implemented on the

device.

1 Using IAR v6.50.1.4452 with flags --endian=little --cpu=Cortex-M4 -e --fpu=VFPv4_sp –Ohs --

no_size_constraints

4454_140 v1.0

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