LPC1766 datasheet(36/66 Pages) NXP

36 / 66 page

LPC1769_68_67_66_65_64_4

Product data sheet

Rev. 04 — 1 February 2010

36 of 66

NXP Semiconductors

LPC1769/68/67/66/65/64

32-bit ARM Cortex-M3 microcontroller

7.30 System control

7.30.1 Reset

Reset has four sources on the LPC17xx: the RESET pin, the Watchdog reset, power-on

reset (POR), and the BrownOut Detection (BOD) circuit. The RESET pin is a Schmitt

trigger input pin. Assertion of chip Reset by any source, once the operating voltage attains

a usable level, starts the Wake-up timer (see description in Section 7.29.5), causing reset

to remain asserted until the external Reset is de-asserted, the oscillator is running, a fixed

number of clocks have passed, and the flash controller has completed its initialization.

When the internal Reset is removed, the processor begins executing at address 0, which

is initially the Reset vector mapped from the Boot Block. At that point, all of the processor

and peripheral registers have been initialized to predetermined values.

Fig 5.

Power distribution

REAL-TIME CLOCK

BACKUP REGISTERS

3.3 V REGULATOR

32 kHz

OSCILLATOR

POWER

SELECTOR

ULTRA-LOW

POWER

REGULATOR

RTC POWER DOMAIN

MAIN POWER DOMAIN

002aad978

RTCX1

VBAT

VDD(REG)(3V3)

RTCX2

VDD(3V3)

VSS

to memories,

peripherals,

oscillators,

PLLs

to core

to I/O pads

ADC

DAC

ADC POWER DOMAIN

VDDA

VREFP

VREFN

VSSA

LPC17xx

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