ARM VERSION 1.2 Betriebsanweisung Seite 123

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8.4 Target transfer of data
The debug communications channel is accessed by the target as coprocessor 14 on the ARM core using the ARM
instructions MCR and MRC.
Two registers are provided to transfer data:
Comms data read register
A 32-bit wide register used to receive data from the debugger. The following instruction returns
the read register value in Rd:
MRC p14, 0, Rd, c1, c0
Comms data write register
A 32-bit wide register used to send data to the debugger. The following instruction writes the value
in Rn to the write register:
MCR p14, 0, Rn, c1, c0
Caution
Refer to the ARM10 Technical Reference Manual for information on accessing DCC registers for the ARM 10. The
instructions used, positions of the status bits, and interpretation of the status bits are different for processors later
than ARM9.
Debug Communications Channel
Copyright ?1999 2001 ARM Limited 8-4
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