ST25DV04K datasheet(34/220 Pages) STMICROELECTRONICS

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Memory management

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DocID027603 Rev 4

4.4

Dynamic configuration

ST25DV has a set of dynamic registers that allow temporary modification of its behavior or

report on its activity. Dynamic registers are volatile and not restored to their previous values

after POR.

Some static registers have an image in dynamic registers: dynamic register value is

initialized with the static register value and may be updated by the application to modify the

device behavior temporarily (i.e.: set reset of Energy Harvesting). When a valid change

occurs in a static register, in RF or I2C, the corresponding dynamic register is automatically

updated.

Other, dynamic registers, automatically updated, contain indication on ST25DV activity. (i.e.:

IT_STS_Dyn gives the interruption’s status or MB_CTRL_Dyn gives the fast transfer mode

mailbox control).

In RF, dynamic registers can be accessed via dedicated (Fast) Read Dynamic Configuration

and (Fast) Write Dynamic Configuration commands, with a pointer acting as the register

address. No password is needed to access dynamic registers.

In I2C, dynamic registers can be accessed with I2C read and write commands with device

select E2=0. Dynamic registers can be read in continuity. Dynamic registers and fast

transfer mode mailbox can be read in continuity, but not written in continuity. No password is

needed to access dynamic registers.

Table 9 shows the complete map of dynamic registers, as seen by RF interface and by I2C

interface.

Table 9. Dynamic registers memory map

RF access

Dynamic Registers

I2C access

Address

Type

Name

Function

Device

select

Address Type

00h

Table 20: GPO_CTRL_Dyn

GPO control

E2 = 0

2000h

R/W

No access

ST Reserved

E2 = 0

2001h

02h

R/W

Table 24: EH_CTRL_Dyn

Energy Harvesting management &

usage status

E2 = 0

2002h

R/W

No access

Table 27: RF_MNGT_Dyn

RF interface usage management

E2 = 0

2003h

R/W

Table 40: I2C_SSO_Dyn

I2C security session status

E2 = 0

2004h

Table 21: IT_STS_Dyn

Interruptions Status

E2 = 0

2005h

0Dh

R/W

Table 13: MB_CTRL_Dyn

Fast transfer mode control and

status

E2 = 0

2006h

R/W

Table 14: MB_LEN_Dyn

length of fast transfer mode

message

E2 = 0

2007h

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