LPC2210 datasheet(26/39 Pages) PHILIPS

26 / 39 page

Philips Semiconductors

LPC2210

16/32-bit ARM microcontrollers with external memory interface

Preliminary data

Rev. 01 — 09 February 2004

26 of 39

9397 750 12872

6.20.1

Embedded ICE™

Standard ARM EmbeddedICE logic provides on-chip debug support. The debugging

of the target system requires a host computer running the debugger software and an

EmbeddedICE protocol convertor. EmbeddedICE protocol convertor converts the

Remote Debug Protocol commands to the JTAG data needed to access the ARM

core.

The ARM core has a Debug Communication Channel function built-in. The debug

communication channel allows a program running on the target to communicate with

the host debugger or another separate host without stopping the program ﬂow or

even entering the debug state. The debug communication channel is accessed as a

co-processor 14 by the program running on the ARM7TDMI-S core. The debug

communication channel allows the JTAG port to be used for sending and receiving

data without affecting the normal program ﬂow. The debug communication channel

data and control registers are mapped in to addresses in the EmbeddedICE™ logic.

6.20.2

Embedded trace

Since the LPC2210 has signiﬁcant amounts of on-chip memory, it is not possible to

determine how the processor core is operating simply by observing the external pins.

The Embedded Trace Macrocell provides real-time trace capability for deeply

embedded processor cores. It outputs information about processor execution to the

trace port.

The ETM is connected directly to the ARM core and not to the main AMBA system

bus. It compresses the trace information and exports it through a narrow trace port.

An external trace port analyzer must capture the trace information under software

debugger control. Instruction trace (or PC trace) shows the ﬂow of execution of the

processor and provides a list of all the instructions that were executed. Instruction

trace is signiﬁcantly compressed by only broadcasting branch addresses as well as a

set of status signals that indicate the pipeline status on a cycle by cycle basis. Trace

information generation can be controlled by selecting the trigger resource. Trigger

resources include address comparators, counters and sequencers. Since trace

information is compressed the software debugger requires a static image of the code

being executed. Self-modifying code can not be traced because of this restriction.

6.20.3

RealMonitor™

RealMonitor is a conﬁgurable software module, developed by ARM Inc., which

enables real time debug. It is a lightweight debug monitor that runs in the background

while users debug their foreground application. It communicates with the host using

the DCC (Debug Communications Channel), which is present in the EmbeddedICE

logic. The LPC2210 contains a speciﬁc conﬁguration of RealMonitor software

programmed into the on-chip memory.

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