7.1. About the Debug Communications Channel

The EmbeddedICE® logic in ARM® cores such as ARM7TDMI® and ARM9TDMI® contains a debug communications channel. This enables data to be passed between the target and the host debugger using the JTAG port and a protocol converter such as Multi-ICE®, without stopping the program flow or entering debug state. This chapter describes how the DCC can be accessed by a program running on the target, and by the host debugger.

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