DCB

Instance: DCB
Component: DCB
Base address: 0xE000EDE0

Bits	Field Name	Description	Type	Reset
31:27	RES0	Reserved, RES0	RO	0b0 0000
26	S_RESTART_ST	Indicates the PE has processed a request to clear DHCSR.C_HALT to 0. That is, either a write to DHCSR that clears DHCSR.C_HALT from 1 to 0, or an External Restart Request	RO	0
25	S_RESET_ST	Indicates whether the PE has been reset since the last read of the DHCSR	RO	0
24	S_RETIRE_ST	Set to 1 every time the PE retires one of more instructions	RO	0
23:21	RES0_1	Reserved, RES0	RO	0b000
20	S_SDE	Indicates whether Secure invasive debug is allowed	RO	0
19	S_LOCKUP	Indicates whether the PE is in Lockup state	RO	0
18	S_SLEEP	Indicates whether the PE is sleeping	RO	0
17	S_HALT	Indicates whether the PE is in Debug state	RO	0
31:16	DBGKEY	A debugger must write 0xA05F to this field to enable write access to the remaining bits, otherwise the PE ignores the write access	WO	0x0000
16	S_REGRDY	Handshake flag to transfers through the DCRDR	RO	0
15:6	RES0_2	Reserved, RES0	RO	0b00 0000 0000
5	C_SNAPSTALL	Allow imprecise entry to Debug state	RW	0
4	RES0_3	Reserved, RES0	RO	0
3	C_MASKINTS	When debug is enabled, the debugger can write to this bit to mask PendSV, SysTick and external configurable interrupts	RW	0
2	C_STEP	Enable single instruction step	RW	0
1	C_HALT	PE enter Debug state halt request	RW	0
0	C_DEBUGEN	Enable Halting debug	RW	0

Address Offset	0x0000 0014
Physical Address	0xE000 EDF4	Instance	0xE000 EDF4
Description	With the DCRDR, provides debug access to the general-purpose registers, special-purpose registers, and the FP extension registers. A write to the DCRSR specifies the register to transfer, whether the transfer is a read or write, and starts the transfer
Type

Bits	Field Name	Description	Type	Reset
31:17	RES0	Reserved, RES0	RO	0b000 0000 0000 0000
16	REGWnR	Specifies the access type for the transfer	WO	0
15:7	RES0_1	Reserved, RES0	RO	0b0 0000 0000
6:0	REGSEL	Specifies the general-purpose register, special-purpose register, or FP register to transfer	WO	0b000 0000

Address Offset	0x0000 0018
Physical Address	0xE000 EDF8	Instance	0xE000 EDF8
Description	With the DCRSR, provides debug access to the general-purpose registers, special-purpose registers, and the FP Extension registers. If the Main Extension is implemented, it can also be used for message passing between an external debugger and a debug agent running on the PE
Type

Bits	Field Name	Description			Type	Reset
31:0	DBGTMP	Provides debug access for reading and writing the general-purpose registers, special-purpose registers, and Floating-point Extension registers			RW	0x0000 0000

Address Offset	0x0000 001C
Physical Address	0xE000 EDFC	Instance	0xE000 EDFC
Description	Manages vector catch behavior and DebugMonitor handling when debugging
Type

Bits	Field Name	Description	Type	Reset
31:25	RES0	Reserved, RES0	RO	0b000 0000
24	TRCENA	Global enable for all DWT and ITM features	RW	0
23:21	RES0_1	Reserved, RES0	RO	0b000
20	SDME	Indicates whether the DebugMonitor targets the Secure or the Non-secure state and whether debug events are allowed in Secure state	RO	0
19	MON_REQ	DebugMonitor semaphore bit	RW	0
18	MON_STEP	Enable DebugMonitor stepping	RW	0
17	MON_PEND	Sets or clears the pending state of the DebugMonitor exception	RW	0
16	MON_EN	Enable the DebugMonitor exception	RW	0
15:12	RES0_2	Reserved, RES0	RO	0x0
11	VC_SFERR	SecureFault exception halting debug vector catch enable	RW	0
10	VC_HARDERR	HardFault exception halting debug vector catch enable	RW	0
9	VC_INTERR	Enable halting debug vector catch for faults during exception entry and return	RW	0
8	VC_BUSERR	BusFault exception halting debug vector catch enable	RW	0
7	VC_STATERR	Enable halting debug trap on a UsageFault exception caused by a state information error, for example an Undefined Instruction exception	RW	0
6	VC_CHKERR	Enable halting debug trap on a UsageFault exception caused by a checking error, for example an alignment check error	RW	0
5	VC_NOCPERR	Enable halting debug trap on a UsageFault caused by an access to a coprocessor	RW	0
4	VC_MMERR	Enable halting debug trap on a MemManage exception	RW	0
3:1	RES0_3	Reserved, RES0	RO	0b000
0	VC_CORERESET	Enable Reset Vector Catch. This causes a warm reset to halt a running system	RW	0

Address Offset	0x0000 0024
Physical Address	0xE000 EE04	Instance	0xE000 EE04
Description	This register allows the external authentication interface to be overridden from software.
Type

Bits	Field Name	Description	Type	Reset
31:4	RESERVED4	Software should not rely on the value of a reserved. Writing any other value than the reset value may result in undefined behavior.	RO	0x000 0000
3	INTSPNIDEN	Internal Secure non-invasive debug enable. Overrides the external Secure non-invasive debug authentication interface	RW	0
2	SPNIDENSEL	Secure non-invasive debug enable select. Selects between DAUTHCTRL and the external authentication interface for control of Secure non-invasive debug	RW	0
1	INTSPIDEN	Internal Secure invasive debug enable. Overrides the external Secure invasive debug authentication Interfaces.	RW	0
0	SPIDENSEL	Secure invasive debug enable select. Selects between DAUTHCTRL and the external authentication interface for control of Secure invasive debug.	RW	0

Address Offset	0x0000 0028
Physical Address	0xE000 EE08	Instance	0xE000 EE08
Description	Provides control and status information for Secure debug
Type

Bits	Field Name	Description	Type	Reset
31:18	RES0	Reserved, RES0	RO	0b00 0000 0000 0000
17	CDSKEY	Writes to the CDS bit are ignored unless CDSKEY is concurrently written to zero	RW	0
16	CDS	This field indicates the current Security state of the processor	RW	0
15:2	RES0_1	Reserved, RES0	RO	0b00 0000 0000 0000
1	SBRSEL	If SBRSELEN is 1 this bit selects whether the Non-secure or the Secure version of the memory-mapped Banked registers are accessible to the debugger	RW	0
0	SBRSELEN	Controls whether the SBRSEL field or the current Security state of the processor selects which version of the memory-mapped Banked registers are accessed to the debugger	RW	0