ST STM32WL5 Series, Reference Manual, Page: 1325 / 1454

RM0453 Rev 2 1325/1454
RM0453 Debug support (DBG)
1441
Table 267. Debug port registers
Address
A(3:2)
value
R/W Description
0x0 00
R
DP_DIPDR register (see Section 38.4.1 )
Contains the IDCODE for the debug port.
W
DP_ABORTR register
(1)
(see Section 38.4.2 )
Aborts the current AP transaction. This register is also used to clear the error flags in the
DP_CTRLSTATR register.
0x4 01 R/W
If DP_SELECTR.DPBANKSEL = 0, DP_CTRLSTATR register (see Section 38.4.3 )
Controls the DP and provides status information.
If DP_SELECTR.DPBANKSEL = 1, DP_DLCR register
(2)
(see Section 38.4.4 )
Controls the operating mode of the SWD data link.
If DP_SELECTR.DPBANKSEL = 2, DP_TARGETIDR register (see Section 38.4.5 )
Provides target identification information.
If DP_SELECTR.DPBANKSEL = 3, DP_DLPIDR register
(2)
(see Section 38.4.6 )
Provides the SWD protocol version.
0x8 10
R
DP_RESENDR register
(2)
(see Section 38.4.7 )
Returns the value returned by the last AP read or DP_RDBUFFR read. Used in the event
of a corrupted read transfer.
W
DP_SELECTR register (see Section 38.4.8 )
Selects the access port, access port register bank, and DP register at address 0x4.
0xC 11
R
DP_BUFFR register (see Section 38.4.9 )
– Via JTAG-DP - Used to allow the debugger to get the final result after a sequence of
operations (without requesting new JTAG-DP operation).
– Via SW-DP - Contains the result of the preceding AP read access, allowing a new AP
access to be avoided.
W
DP_TARGETSELR register
(2)
(see Section 38.4.10 )
On a write to DP_TARGETSELR immediately following a line reset sequence, the target
is selected if both the following conditions are met:
– Bits [31:28] match bits [31:28] in the DP_DLPIDR register.
– Bits [27:0] match bits [27:0] in the DP_TARGETIDR register.
Writing any other value de-selects the target. Debug tools must write 0xFFFFFFFF to de-
select all targets. This is an invalid TARGETID value. All other invalid TARGETID values
are reserved.
1. Access to the DP_ABORTR register from the JTAG-DP is done using the ABORT instruction.
2. Only accessible via SW-DP. Register is “reserved” via JTAG-DP.