LPC2292 datasheet(27/40 Pages) PHILIPS

27 / 40 page

Philips Semiconductors

LPC2292/LPC2294

16/32-bit ARM microcontrollers with external memory interface

Preliminary data

Rev. 01 — 05 February 2004

27 of 40

9397 750 12748

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.

6.22.2

Embedded trace

Since the LPC2292/LPC2294 have 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.

6.22.3

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 LPC2292/LPC2294 contain a speciﬁc conﬁguration of RealMonitor

software programmed into the on-chip Flash memory.

Limiting values

Table 9:

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol

Parameter

Conditions

Min

Max

Unit

V18

Supply voltage, internal rail

−0.5

+2.5

Supply voltage, external rail

−0.5

+3.6

V3A

Analog 3.3 V pad supply voltage

−0.5

4.6

AVIN

Analog input voltage on A/D related

pins

−0.5

5.1

DC input voltage, 5 V tolerant I/O

pins[3][4]

−0.5

6.0

DC input voltage, other I/O pins[2][3]

−0.5

V3 + 0.5 V

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