9.5.2 SEALED to UNSEALED
SEALED to UNSEALED instructs the device to extend access to the standard and extended registers and data
flash space and clears the
[SEC1][SEC0]
flags. In UNSEALED mode, all data, standard and extended registers
and DF have read/write access. Unsealing is a two-step command performed by writing the first word of the
unseal key to
MACSubcmd() (MAC)
, followed by the second word of the unseal key to
MACSubcmd()
. The
unseal key can be read and changed via the
MAC SecurityKey()
command when in FULL ACCESS mode. To
return to the SEALED mode, either a hardware reset is needed, or the
MAC Seal Device()
command is needed
to transit from FULL ACCESS or UNSEALED to SEALED.
9.5.3 UNSEALED to FULL ACCESS
UNSEALED to FULL ACCESS instructs the device to allow full access to all standard and extended registers
and data flash. The device is shipped from TI in this mode. The keys for UNSEALED to FULL ACCESS can
be read and changed via the MAC command
SecurityKey()
when in FULL ACCESS mode. Changing from
UNSEALED to FULL ACCESS is performed by using the
MACSubcmd()
command, by writing the first word of
the Full Access Key to
MACSubcmd()
, followed by the second word of the Full Access Key to
MACSubcmd()
. In
FULL ACCESS mode, the command to go to boot ROM can be sent.
Device Security
SLUUCO0 – APRIL 2022
BQ28Z610-R2
55
Copyright © 2022 Texas Instruments Incorporated
Содержание BQ28Z610-R2
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