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LPC2292FBD144 数据表(PDF) 28 Page - NXP Semiconductors |
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LPC2292FBD144 数据表(HTML) 28 Page - NXP Semiconductors |
28 / 54 page LPC2292_2294_6 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 06 — 10 December 2007 28 of 54 NXP Semiconductors LPC2292/LPC2294 16/32-bit ARM microcontrollers with external memory interface 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. The JTAG clock (TCK) must be slower than 1 ⁄ 6 of the CPU clock (CCLK) for the JTAG interface to operate. 6.20.2 Embedded trace Since the LPC2292/2294 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 (ETM) 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 cannot 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 Debug Communications Channel (DCC), which is present in the EmbeddedICE logic. The LPC2292/2294 contain a specific configuration of RealMonitor software programmed into the on-chip flash memory. |
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