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System Control Coprocessor
ARM DDI 0363E Copyright © 2009 ARM Limited. All rights reserved. 4-20
ID013010 Non-Confidential, Unrestricted Access
To access the Processor Feature Register 1 read CP15 with:
MRC p15, 0, <Rd>, c0, c1, 1 ; Read Processor Feature Register 1
4.2.8 c0, Debug Feature Register 0
The Debug Feature Register 0 provides information about the debug system for the processor.
Debug Feature Register 0 is:
• a read-only register
• accessible in Privileged mode only.
Figure 4-14 shows the bit arrangement for Debug Feature Register 0.
Figure 4-14 Debug Feature Register 0 format
Table 4-9 shows how the bit values correspond with the Debug Feature Register 0 functions.
[11:8] Microcontroller programmer’s model Indicates support for Microcontroller programmer’s model:
0x0
, no support.
[7:4] Security extension Indicates support for Security Extensions Architecture:
0x0
, no support.
[3:0] ARMv4 Programmer’s model Indicates support for standard ARMv4 programmer’s model:
0x1
, the processor supports the ARMv4 model.
Table 4-8 Processor Feature Register 1 bit functions (continued)
Bits Field Function
Reserved
Microcontroller debug model – memory mapped
Trace debug model – memory mapped
Trace debug model – coprocessor
Core debug model – memory mapped
Core debug model – coprocessor
Secure debug model
31 24 23 20 19 16 15 12 11 8 7 4 3 0
Table 4-9 Debug Feature Register 0 bit functions
Bits Field Function
[31:24] Reserved SBZ.
[23:20] Microcontroller
Debug model -
memory mapped
Indicates support for the microcontroller debug model - memory mapped:
0x0
, no support.
[19:16] Trace debug model -
memory mapped
Indicates support for the trace debug model - memory mapped:
0x1
, trace supported, memory mapped access.
[15:12] Trace debug model -
coprocessor
Indicates support for the trace debug model - coprocessor:
0x0
, no support.