LPC546xx
NXP Semiconductors
32-bit ARM Cortex-M4 microcontroller
GPIO Pin Interrupts, GPIO Group Interrupts, and selected peripherals such as USB0,
USB1, 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
UM10912, LPC546xx. user manual.
7.14.3 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 LPC546xx can wake up from deep power-down mode
via the RESET pin and the RTC alarm. The ALARM1HZ flag in RTC control register
generates an RTC wake-up interrupt request, which can wake up the part. During deep
power-down mode, the contents of the SRAM and registers are not retained. All functional
pins are tri-stated in deep power-down mode.
Table 8 shows the peripheral configuration in reduced power modes.
Table 8.
Peripheral configuration in reduced power modes
Reduced power mode
Peripheral
Sleep
Deep-sleep
Deep power-down
FRO
Flash
BOD
PLL
Software configured Software configured
Software configured Standby
Off
Off
Off
Off
Off
Software configured Software configured
Software configured Off
Watchdog osc and
WWDT
Software configured Software configured
Micro-tick Timer
DMA
Software configured Software configured
Off
Off
Active
Configurable some for operations. For more details,
see UM10912, LPC546xx. user manual.
USART
Software configured Off; but can create a wake-up interrupt in synchronous Off
slave mode or 32 kHz clock mode
SPI
Software configured Off; but can create a wake-up interrupt in slave mode Off
Software configured Off; but can create a wake-up interrupt in slave mode Off
I2C
USB0
USB1
Ethernet
DMIC
Software configured Software configured
Software configured Software configured
Software configured Off
Off
Off
Off
Software configured Software configured
Off
Other digital peripherals Software configured Off
Off
RTC oscillator
Software configured Software configured
Software configured
LPC546xx
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 2.5 — 20 June 2018
65 of 169
NXP [ NXP ]
