LPC81XM datasheet(25/67 Pages) NXP

25 / 67 page

LPC81xM

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Objective data sheet

Rev. 1.0 — 7 November 2012

25 of 67

NXP Semiconductors

LPC81xM

32-bit ARM Cortex-M0+ microcontroller

7.20.6.3

Deep-sleep mode

In Deep-sleep mode, the LPC81xM is in Sleep-mode and all peripheral clocks and all

clock sources are off except for the IRC and watchdog oscillator or low-power oscillator if

selected. The IRC output is disabled. In addition all analog blocks are shut down and the

flash is in stand-by mode. In Deep-sleep mode, the application can keep the watchdog

oscillator and the BOD circuit running for self-timed wake-up and BOD protection.

The LPC81xM can wake up from Deep-sleep mode via a reset, digital pins selected as

inputs to the pin interrupt block, a watchdog timer interrupt, or an interrupt from the

USART (if the USART is configured in synchronous slave mode), the SPI, or the I2C

blocks (in slave mode).

Any interrupt used for waking up from Deep-sleep mode must be enabled in one of the

SYSCON wake-up enable registers and the NVIC.

Deep-sleep mode saves power and allows for short wake-up times.

7.20.6.4

Power-down mode

In Power-down mode, the LPC81xM is in Sleep-mode and all peripheral clocks and all

clock sources are off except for watchdog oscillator or low-power oscillator if selected. In

addition all analog blocks and the flash are shut down. In Power-down mode, the

application can keep the watchdog oscillator and the BOD circuit running for self-timed

wake-up and BOD protection.

The LPC81xM can wake up from Power-down mode via a reset, digital pins selected as

inputs to the pin interrupt block, a watchdog timer interrupt, or an interrupt from the

USART (if the USART is configured in synchronous slave mode), the SPI, or the I2C

blocks (in slave mode).

Any interrupt used for waking up from Power-down mode must be enabled in one of the

SYSCON wake-up enable registers and the NVIC.

Power-down mode reduces power consumption compared to Deep-sleep mode at the

expense of longer wake-up times.

7.20.6.5

Deep power-down mode

In Deep power-down mode, power is shut off to the entire chip except for the WAKEUP

pin and the self wake-up timer if enabled. The LPC81xM can wake up from Deep

power-down mode via the WAKEUP pin, or without an external signal by using the

time-out of the self wake-up timer (see Section 7.18).

The LPC81xM can be prevented from entering Deep power-down mode by setting a lock

bit in the PMU block. Locking out Deep power-down mode enables the application to keep

the watchdog timer or the BOD running at all times.

When entering Deep power-down mode, an external pull-up resistor is required on the

WAKEUP pin to hold it HIGH. Pull the RESET pin HIGH to prevent it from floating while in

Deep power-down mode.

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