OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 354

• 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

24.1 How to read this chapter
24.2 Features
24.3 General description
24.4 Pin description
24.5 Debug notes
UM10441
User manual
24.5.1 Debug limitations
The debug functionality is identical on all LPC122x parts.
Debug functions are integrated into the ARM Cortex-M0. Debugging with the LPC122x
uses the Serial Wire Debug mode.
Table 351. Serial Wire Debug pin description
Important: The user should be aware of certain limitations during debugging. The most
important is that, due to limitations of the ARM Cortex-M0 integration, the LPC122x
cannot wake up in the usual manner from Deep-sleep mode. It is recommended not to
use this mode during debug.
Another issue is that debug mode changes the way in which reduced power modes work
internal to the ARM Cortex-M0 CPU, and this ripples through the entire system. These
differences mean that power measurements should not be made while debugging, the
results will be higher than during normal operation in an application.
Pin Name
SWCLK
SWDIO
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UM10441
Chapter 24: LPC122x Serial Wire Debug (SWD)
Rev. 1.1 — 10 March 2011
Supports ARM Serial Wire Debug mode.
Direct debug access to all memories, registers, and peripherals.
No target resources are required for the debugging session.
Four breakpoints. Four instruction breakpoints, which can also be used to remap
instruction addresses for code patches. Two data comparators which can be used to
remap addresses for patches to literal values.
Two data watchpoints, which can also be used as trace triggers.
All information provided in this document is subject to legal disclaimers.
Type
Input
Input /
Output
Rev. 1.1 — 10 March 2011
Description
Serial Wire Clock. This pin is the clock for debug logic when in the
Serial Wire Debug mode (SWDCLK).
Serial wire debug data input/output. The SWDIO pin is used by an
external debug tool to communicate with and control the ARM
Cortex-M0 CPU.
© NXP B.V. 2011. All rights reserved.
User manual
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