dwt简介Data Watchpoint and Trace (DWT)
Data Watchpoint and Trace (DWT) for real-time variable monitoring and PC-sampling, which can in turn be used to periodically output the PC or various CPU-internal counters, which can be used to obtain profiling information from the target.
使用J-LinkV8
IAR版本6.6
调试串口波特率：115200
基于MDKK70-EK_T43硬件平台
关键词: Freescale 飞思卡尔 Kinetis Cortex-M4 K70 MDKK70 核心板 开发板 例程 DWT
串口输出：
//在没有仿真的情况下进入Debug中断
External Pin Reset
K70-256pin Silicon rev 1.0
Flash parameter version 0.0.8.0
Flash version ID 1.0.18.0
DWT watchpoint demo!!
Hit any key to start
set dwt watchpoint
//此时程序发生仿真中断，LED_D31灯亮起
****default_isr entered on vector 12*****
comparator match
//进行仿真时
Software Reset
K70-256pin Silicon rev 1.0
Flash parameter version 0.0.8.0
Flash version ID 1.0.18.0
DWT watchpoint demo!!
Hit any key to start
set dwt watchpoint
//此时程序仿真发生中断，LED_D31灯亮起，按IAR下按F5继续运行程序
comparator match
简单的说就是设置好触发源，在希望输出调试信息的地方操作触发源触发该中断。
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