UICR — User information configuration registers

The user information configuration registers (UICRs) are non-volatile memory (NVM) registers for configuring user specific settings.

For information on writing UICR registers, see the NVMC — Non-volatile memory controller and Memory chapters.

Registers

Instances

Instance	Base address	TrustZone			Split access	Description
Instance	Base address	Map	Att	DMA	Split access	Description
UICR	0x00FF8000	HF	S	NA	No	User information configuration

Register overview

Register	Offset	Description
APPROTECT	0x000	Access port protection
XOSC32M	0x014	Oscillator control
HFXOSRC	0x01C	HFXO clock source selection
HFXOCNT	0x020	HFXO startup counter
APPNVMCPOFGUARD	0x024	Enable blocking NVM WRITE and aborting NVM ERASE for Application NVM in POFWARN condition.
SECUREAPPROTECT	0x02C	Secure access port protection
ERASEPROTECT	0x030	Erase protection
OTP[n]	0x108	One time programmable memory
KEYSLOT.CONFIG[n].DEST	0x400	Destination address where content of the key value registers (KEYSLOT.KEYn.VALUE[0-3]) will be pushed by KMU. Note that this address must match that of a peripheral's APB mapped write-only key registers, otherwise the KMU can push this key value into an address range which the CPU can potentially read.
KEYSLOT.CONFIG[n].PERM	0x404	Define permissions for the key slot. Bits 0-15 and 16-31 can only be written when equal to 0xFFFF.
KEYSLOT.KEY[n].VALUE[o]	0x800	Define bits [31+o32:0+o32] of value assigned to KMU key slot.

APPROTECT

Address offset: 0x000

Access port protection

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	PALL										Blocks debugger read/write access to all CPU registers and memory mapped addresses Any value different to HwUnprotected will make access port protected.
			HwUnprotected	0x50FA50FA								HwUnprotected
			Protected	0x00000000								Protected

XOSC32M

Address offset: 0x014

Oscillator control

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																														A	A	A	A	A	A
Reset 0xFFFFFFCF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	0	0	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	CTRL										Pierce current DAC control signals

HFXOSRC

Address offset: 0x01C

HFXO clock source selection

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	HFXOSRC										HFXO clock source selection
			XTAL	1								32 MHz crystal oscillator
			TCXO	0								32 MHz temperature compensated crystal oscillator (TCXO)

HFXOCNT

Address offset: 0x020

HFXO startup counter

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																												A	A	A	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	HFXOCNT										HFXO startup counter. Total debounce time = HFXOCNT*64 us + 0.5 us
			MinDebounceTime	0								Min debounce time = (0*64 us + 0.5 us)
			MaxDebounceTime	255								Max debounce time = (255*64 us + 0.5 us)

APPNVMCPOFGUARD

Address offset: 0x024

Enable blocking NVM WRITE and aborting NVM ERASE for Application NVM in POFWARN condition.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	NVMCPOFGUARDEN										Enable blocking NVM WRITE and aborting NVM ERASE in POFWARN condition
			Disabled	0								NVM WRITE and NVM ERASE are not blocked in POFWARN condition
			Enabled	1								NVM WRITE and NVM ERASE are blocked in POFWARN condition

SECUREAPPROTECT

Address offset: 0x02C

Secure access port protection

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	PALL										Blocks debugger read/write access to all secure CPU registers and secure memory mapped addresses Any value different to HwUnprotected will make access port protected.
			HwUnprotected	0x50FA50FA								HwUnprotected
			Protected	0x00000000								Protected

ERASEPROTECT

Address offset: 0x030

Erase protection

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	PALL										Blocks NVMC ERASEALL and CTRLAP ERASEALL functionality
			Unprotected	0xFFFFFFFF								Unprotected
			Protected	0x00000000								Protected

OTP[n] (n=0..189)

Address offset: 0x108 + (n × 0x4)

One time programmable memory

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				B	B	B	B	B	B	B	B	B	B	B	B	B	B	B	B	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW1	LOWER										Lower half word Note: Can only be written to a non 0xFFFF value once.
B	RW1	UPPER										Upper half word Note: Can only be written to a non 0xFFFF value once.

KEYSLOT.CONFIG[n].DEST (n=0..127)

Address offset: 0x400 + (n × 0x8)

Destination address where content of the key value registers (KEYSLOT.KEYn.VALUE[0-3]) will be pushed by KMU. Note that this address must match that of a peripheral's APB mapped write-only key registers, otherwise the KMU can push this key value into an address range which the CPU can potentially read.

Note: Writing/reading this register requires the KMU SELECTKEYSLOT register to be set to n+1.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	DEST										Secure APB destination address

KEYSLOT.CONFIG[n].PERM (n=0..127)

Address offset: 0x404 + (n × 0x8)

Define permissions for the key slot. Bits 0-15 and 16-31 can only be written when equal to 0xFFFF.

Note: Writing/reading this register requires the KMU SELECTKEYSLOT register to be set to n+1.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																			D														C	B	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	WRITE										Write permission for key slot
			Disabled	0								Disable write to the key value registers
			Enabled	1								Enable write to the key value registers
B	RW	READ										Read permission for key slot
			Disabled	0								Disable read from key value registers
			Enabled	1								Enable read from key value registers
C	RW	PUSH										Push permission for key slot
			Disabled	0								Disable pushing of key value registers over secure APB, but can be read if field READ is Enabled
			Enabled	1								Enable pushing of key value registers over secure APB. Register KEYSLOT.CONFIGn.DEST must contain a valid destination address!
D	RW	STATE										Revocation state for the key slot Note that it is not possible to undo a key revocation by writing the value '1' to this field
			Revoked	0								Key value registers can no longer be read or pushed
			Active	1								Key value registers are readable (if enabled) and can be pushed (if enabled)

KEYSLOT.KEY[n].VALUE[o] (n=0..127) (o=0..3)

Address offset: 0x800 + (n × 0x10) + (o × 0x4)

Define bits [31+o*32:0+o*32] of value assigned to KMU key slot.

Note: Writing/reading this register requires the KMU SELECTKEYSLOT register to be set to n+1.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	VALUE										Define bits [31+o32:0+o32] of value assigned to KMU key slot