LPC2377 datasheet(35/55 Pages) NXP

35 / 55 page

LPC2377_78_4

Product data sheet

Rev. 04 — 19 November 2008

35 of 55

NXP Semiconductors

LPC2377/78

Single-chip 16-bit/32-bit microcontroller

information about processor execution to a trace port. A software debugger allows

conﬁguration of the ETM using a JTAG interface and displays the trace information that

has been captured.

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 captures the trace information under software debugger control. The

trace port can broadcast the Instruction trace information. 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.

7.27.3 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, which is

present in the EmbeddedICE logic. The LPC2377/78 contain a speciﬁc conﬁguration of

RealMonitor software programmed into the on-chip ROM memory.

LPC2377 Datasheet(PDF) 35 Page - NXP Semiconductors