9.3 SWD status and control registers
Through the ARM Debug Access Port (DAP), the debugger has access to the status and
control elements, implemented as registers on the DAP bus as shown in the following
figure. These registers provide additional control and status for low power mode recovery
and typical run-control scenarios. The status register bits also provide a means for the
debugger to get updated status of the core without having to initiate a bus transaction
across the crossbar switch, thus remaining less intrusive during a debug session.
It is important to note that these DAP control and status registers are not memory mapped
within the system memory map and are only accessible via the Debug Access Port using
SWD. The MDM-AP is accessible as Debug Access Port 1 with the available registers
shown in the table below.
Table 9-2. MDM-AP Register Summary
Address Register Description
0x0100_0000 Status See MDM-AP Status Register
0x0100_0004 Control See MDM-AP Control Register
0x0100_00FC IDR Read-only identification register that
always reads as 0x001C_0020
SWD status and control registers
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
152 Freescale Semiconductor, Inc.
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