LPC802 datasheet(64/83 Pages) NXP

64 / 83 page

LPC802

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Product data sheet

Rev. 1.6 — 27 April 2018

64 of 83

NXP Semiconductors

LPC802

32-bit ARM Cortex-M0+ microcontroller

15. Application information

15.1 Start-up behavior

Figure 33 shows the start-up timing after reset. The FRO 12 MHz oscillator provides the

default clock at Reset and provides a clean system clock shortly after the supply pins

reach operating voltage.

15.2 Connecting power, clocks, and debug functions

Figure 34 shows the basic board connections used to power the LPC802 and provide

debug capabilities via the serial wire port.

Fig 33. Start-up timing

Table 30.

Typical start-up timing parameters

Parameter

Description

Value

FRO start time

 26 s

Internal reset de-asserted

101

s

Boot time

s

aaa-028455

valid threshold

= 1.71 V

processor status

VDD

FRO status

internal reset

GND

boot time

user code

boot code

execution

finishes;

user code starts

FRO

starts

supply ramp-up

time

tb μs

ta μs

tc μs

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