LPC1763 datasheet(39/86 Pages) PHILIPS

39 / 86 page

LPC1769_68_67_66_65_64_63

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Product data sheet

Rev. 9.3 — 8 January 2014

39 of 86

NXP Semiconductors

LPC1769/68/67/66/65/64/63

32-bit ARM Cortex-M3 microcontroller

The Deep-sleep mode can be terminated and normal operation resumed by either a

Reset or certain specific interrupts that are able to function without clocks. Since all

dynamic operation of the chip is suspended, Deep-sleep mode reduces chip power

consumption to a very low value. Power to the flash memory is left on in Deep-sleep

mode, allowing a very quick wake-up.

On wake-up from Deep-sleep mode, the code execution and peripherals activities will

resume after 4 cycles expire if the IRC was used before entering Deep-sleep mode. If the

main external oscillator was used, the code execution will resume when 4096 cycles

expire. PLL and clock dividers need to be reconfigured accordingly.

8.29.6.3

Power-down mode

Power-down mode does everything that Deep-sleep mode does, but also turns off the

power to the IRC oscillator and the flash memory. This saves more power but requires

waiting for resumption of flash operation before execution of code or data access in the

flash memory can be accomplished.

On the wake-up of Power-down mode, if the IRC was used before entering Power-down

mode, it will take IRC 60

s to start-up. After this 4 IRC cycles will expire before the code

execution can then be resumed if the code was running from SRAM. In the meantime, the

flash wake-up timer then counts 4 MHz IRC clock cycles to make the 100

s flash start-up

time. When it times out, access to the flash will be allowed. Users need to reconfigure the

PLL and clock dividers accordingly.

8.29.6.4

Deep power-down mode

The Deep power-down mode can only be entered from the RTC block. In Deep

power-down mode, power is shut off to the entire chip with the exception of the RTC

module and the RESET pin.

The LPC17xx can wake up from Deep power-down mode via the RESET pin or an alarm

match event of the RTC.

8.29.6.5

Wake-up interrupt controller

The Wake-up Interrupt Controller (WIC) allows the CPU to automatically wake up from

any enabled priority interrupt that can occur while the clocks are stopped in Deep sleep,

Power-down, and Deep power-down modes.

The WIC works in connection with the Nested Vectored Interrupt Controller (NVIC). When

the CPU enters Deep sleep, Power-down, or Deep power-down mode, the NVIC sends a

mask of the current interrupt situation to the WIC.This mask includes all of the interrupts

that are both enabled and of sufficient priority to be serviced immediately. With this

information, the WIC simply notices when one of the interrupts has occurred and then it

wakes up the CPU.

The WIC eliminates the need to periodically wake up the CPU and poll the interrupts

resulting in additional power savings.

8.29.7 Peripheral power control

A Power Control for Peripherals feature allows individual peripherals to be turned off if

they are not needed in the application, resulting in additional power savings.

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