Debug Interface
5-20 Copyright © 2001, 2004 ARM Limited. All rights reserved. ARM DDI 0210C
Interrupt-driven use of the DCC
An alternative, and potentially more efficient, method to polling the debug
communications control register is to use the COMMTX and COMMRX outputs from
the ARM7TDMI processor. You can use these outputs to interrupt the processor when:
• a word is available to be read from the DCC data read register
• the DCC data write register is empty and available for use.
These outputs are usually connected to the system interrupt controller, that drives the
nIRQ and nFIQ ARM7TDMI processor inputs.
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