LPC844 datasheet(76/97 Pages) NXP

76 / 97 page

LPC84x

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Product data sheet

Rev. 1.7 — 27 February 2018

76 of 97

NXP Semiconductors

LPC84x

32-bit Arm Cortex-M0+ microcontroller

14. Application information

14.1 Start-up behavior

Figure 36 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.

Fig 36. Start-up timing

Table 33.

Typical start-up timing parameters

Parameter

Description

Value

FRO start time

 26 s

Internal reset de-asserted

101

s

Boot time

s

aaa-027486

valid threshold

= 1.8 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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