AN3223 datasheet(10/29 Pages) STMICROELECTRONICS

10 / 29 page

Internal registers

AN3223

10/29

Doc ID 17553 Rev 2

Internal registers

4.1

Accessing the internal registers

There are six internal registers in the STCF04 (which are the COMMAND, FLASH,

AUX_LED, STATUS, FEATURE, and TORCH registers). The STATUS register is read-only.

The COMMAND and FEATURE registers can be accessed in any operation mode. All the

other registers can be accessed in any mode, except in Shutdown, Shutdown + NTC, and

Monitoring mode. When the device enters Shutdown mode, the FLASH, AUX_LED,

STATUS, and TORCH registers are cleared. The COMMAND and FEATURE register values

remain untouched when entering Shutdown mode, however reading their value gives 0

when the bit PWR_ON = 0.

Table 2 shows the accessibility of each register in all operation

modes.

In other words, whenever the PWR_ON bit in the COMMAND register is set to zero, then

only the COMMAND and FEATURE registers can be accessed. It is necessary to set the

PWR_ON bit to 1 to access all the registers.

Table 2.

Accessibility of internal registers

Address

Mode

Shutdown

value

Power-ON

reset value

Shutdown and

Monitoring

Idle, Charging, Flash,

Torch and AUX LED

COMMAND

Read / Write

Untouched

Cleared

FLASH

Inaccessible

Read / Write

Cleared

AUX_LED

Inaccessible

Read / Write

Cleared

STATUS

Inaccessible

Read only

Cleared

FEATURE

Read / Write

Untouched

Cleared

TORCH

Inaccessible

Read / Write

Cleared

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