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Chapter 5
Debug Support
ARM DDI0145B
This chapter describes the debug support for the ARM9TDMI, including the
EmbeddedICE macrocell:
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About debug on page 5-2.
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Debug systems on page 5-3.
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Debug interface signals on page 5-5.
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Scan chains and JTAG interface on page 5-11.
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The JTAG state machine on page 5-12.
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Test data registers on page 5-19.
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ARM9TDMI core clocks on page 5-26.
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Clock switching during debug on page 5-27.
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Clock switching during test on page 5-28.
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Determining the core state and system state on page 5-29.
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Exit from debug state on page 5-32.
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The behavior of the program counter during debug on page 5-35.
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EmbeddedICE macrocell on page 5-38.
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Vector catching on page 5-46.
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Single stepping on page 5-47.
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Debug communications channel on page 5-48.
Copyright © 1998, 1999 ARM Limited. All rights reserved.
5-1
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