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LPC5411x
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© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 2.1 — 9 May 2018
31 of 105
NXP Semiconductors
LPC5411x
32-bit ARM Cortex-M4/M0+ microcontroller
4. In addition to the three CRP levels, sampling of the ISP entry pin for valid user code
can be disabled (No_ISP mode). For details, see the LPC5411x user manual.
7.15 Power control
The LPC5411x support a variety of power control features. In Active mode, when the chip
is running, power and clocks to selected peripherals can be adjusted for power
consumption. In addition, there are four special modes of processor power reduction with
different peripherals running: sleep mode, deep-sleep mode, and deep power-down
mode, activated by the power mode configure API.
7.15.1 Sleep mode
In sleep mode, the system clock to the CPU is stopped and execution of instructions is
suspended until either a reset or an interrupt occurs. Peripheral functions, if selected to be
clocked can continue operation during Sleep mode and may generate interrupts to cause
the processor to resume execution. Sleep mode eliminates dynamic power used by the
processor itself, memory systems and related controllers, internal buses, and unused
peripherals. The processor state and registers, peripheral registers, and internal SRAM
values are maintained, and the logic levels of the pins remain static.
7.15.2 Deep-sleep mode
In deep-sleep mode, the system clock to the processor is disabled as in sleep mode. All
analog blocks are powered down by default but can be selected to keep running through
the power API if needed as wake-up sources. The main clock and all peripheral clocks are
disabled. The FRO is disabled. The flash memory is put in standby mode.
Deep-sleep mode eliminates all power used by analog peripherals and all dynamic power
used by the processor itself, memory systems and related controllers, and internal buses.
The processor state and registers, peripheral registers, and internal SRAM values are
maintained, and the logic levels of the pins remain static.
GPIO Pin Interrupts, GPIO Group Interrupts, and selected peripherals such as USB,
DMIC, SPI, I2C, USART, WWDT, RTC, Micro-tick Timer, and BOD can be left running in
deep sleep mode The FRO, RTC oscillator, and the watchdog oscillator can be left
running. In some cases, DMA can operate in deep-sleep mode. For more details, see
LPC5411x user manual.
7.15.3 Deep power-down mode
In deep power-down mode, power is shut off to the entire chip except for the RTC power
domain and the RESET pin. The LPC5411x can wake up from deep power-down mode
via the RESET pin and the RTC alarm. The ALARM1HZ flag in RTC control register
CAUTION
If level three Code Read Protection (CRP3) is selected, no future factory testing can be
performed on the device.