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This is accomplished by P&E's ICD (In-Circuit Debugger) software on the host PC by generating the following reset
sequence:
1. Reset is driven low (to processor).
2. Shifting activity appears on TCLK, TDI and TDO. (PC software instructs the processor to enable debug
mode).
3. Reset is released by Multilink and will go high.
4. Shifting activity appears on TCLK, TDI and TDO. (Debug activity).
Note that if the device does not enter debug mode, the ICD debugger issues the error message “Cannot enter
background mode.” If you receive this message, you should first refer to the troubleshooting section of this
document. You should then check your hardware with a scope, logic analyzer or logic probe.
First check for power on,
then check to make sure the processor oscillator is running.
Finally, look for the startup sequence given above.---》上面的流程可以用示波器检测对应外部引脚看到结果?这些流程不是P&E工具ICD软件自动完成的么,可以步进检测么?怎么理解这句?
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