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Chapter 6 S12Z Debug (S12ZDBGV2) Module
MC9S12ZVM Family Reference Manual Rev. 1.3
230
Freescale Semiconductor
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When a reset occurs the debugger pulls BKGD low until the reset ends, forcing SSC mode entry.
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Then the debugger reads the reset flags to determine the cause of reset.
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If required, the debugger can read the trace buffer to see what happened just before reset. Since the
trace buffer and DBGCNT register are not affected by resets other than POR.
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The debugger configures and arms the DBG to start tracing on returning to application code.
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The debugger then sets the PC according to the reset flags.
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Then the debugger returns to user code with GO or STEP1.
6.5.3
Breakpoints from other S12Z sources
The DBG is neither affected by CPU BGND instructions, nor by BDC BACKGROUND commands.
6.5.4
Code Profiling
The code profiling data output pin PDO is mapped to a device pin that can also be used as GPIO in an
application. If profiling is required and all pins are required in the application, it is recommended to use
the device pin for a simple output function in the application, without feedback to the chip. In this way the
application can still be profiled, since the pin has no effect on code flow.
The PDO provides a simple bit stream that must be strobed at both edges of the profiling clock when
profiling. The external development tool activates profiling by setting the DBG ARM bit, with PROFILE
and PDOE already set. Thereafter the first bit of the profiling bit stream is valid at the first rising edge of
the profiling clock. No start bit is provided. The external development tool must detect this first rising edge
after arming the DBG. To detect the end of profiling, the DBG ARM bit can be monitored using the BDC.
Содержание MC9S12ZVM series
Страница 116: ...Chapter 2 Port Integration Module S12ZVMPIMV1 MC9S12ZVM Family Reference Manual Rev 1 3 116 Freescale Semiconductor ...
Страница 242: ...Chapter 7 ECC Generation Module SRAM_ECCV1 MC9S12ZVM Family Reference Manual Rev 1 3 242 Freescale Semiconductor ...
Страница 384: ...Chapter 10 Supply Voltage Sensor BATSV3 MC9S12ZVM Family Reference Manual Rev 1 3 384 Freescale Semiconductor ...
Страница 484: ...Chapter 13 Programmable Trigger Unit PTUV2 MC9S12ZVM Family Reference Manual Rev 1 3 484 Freescale Semiconductor ...
Страница 662: ...Chapter 17 Gate Drive Unit GDUV4 MC9S12ZVM Family Reference Manual Rev 1 3 662 Freescale Semiconductor ...
Страница 684: ...Chapter 18 LIN Physical Layer S12LINPHYV2 MC9S12ZVM Family Reference Manual Rev 1 3 684 Freescale Semiconductor ...
Страница 740: ...Chapter 19 128 KB Flash Module S12ZFTMRZ128K512V2 MC9S12ZVM Family Reference Manual Rev 1 3 740 Freescale Semiconductor ...
Страница 756: ...Appendix A MCU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 756 Freescale Semiconductor ...
Страница 772: ...Appendix D LINPHY Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 772 Freescale Semiconductor ...
Страница 776: ...Appendix E GDU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 776 Freescale Semiconductor ...
Страница 788: ...Appendix I MSCAN Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 788 Freescale Semiconductor ...
Страница 790: ...Appendix J Package Information MC9S12ZVM Family Reference Manual Rev 1 3 790 Freescale Semiconductor ...