OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 305

• Manufacturer Part Number: OM13008,598
• Description: BOARD LPC XPRESSO LPC122X
• Manufacturer: NXP Semiconductors
• Series: LPCXpressor

Specifications of OM13008,598

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-6642; OM13008

NXP Semiconductors
UM10441
User manual
Fig 53. Boot process flowchart
(1) For details on handling the crystal frequency, see
20.5.3 Boot process flowchart
20.5.4 Criterion for Valid User Code
CRP3/NO_ISP
USER CODE
WATCHDOG
ENABLED?
FLAG SET?
ENABLED?
INITIALIZE
CRP1/2/3
yes
yes
yes
no
RESET
VALID?
A
Criterion for valid user code: The reserved Cortex-M0 exception vector location 7 (offset
0x 0000 001C in the vector table) should contain the 2’s complement of the check-sum of
table entries 0 through 6. This causes the checksum of the first 8 table entries to be 0. The
boot loader code checksums the first 8 locations in sector 0 of the flash. If the result is 0,
then execution control is transferred to the user code.
no
yes
no
no
RECEIVE CRYSTAL FREQUENCY
RUN ISP COMMAND HANDLER
no
(PIO0_12 = LOW)
RUN AUTO-BAUD
ENABLE DEBUG
SUCCESSFUL?
All information provided in this document is subject to legal disclaimers.
AUTO-BAUD
ENTER ISP
yes
yes
MODE?
no
Rev. 1.1 — 10 March 2011
Section 20.8.8 “Reinvoke ISP” on page 322
no
Chapter 20: LPC122x Flash ISP/IAP
USER CODE
no
VALID?
EXECUTE INTERNAL
USER CODE
yes
A
UM10441
© NXP B.V. 2011. All rights reserved.
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