ST25R3918 datasheet(55/141 Pages) STMICROELECTRONICS

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DS13490 Rev 2

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ST25R3918

Application information

140

4.4.1

Set default

This direct command puts the ST25R3918 in the same state as power-up initialization:



performs Stop all activities command



resets all registers to their default state



clears all collision bits

Results of previous calibration and adjust commands are lost. No IRQ due to termination of

direct command is produced.

4.4.2

Stop all activities

This direct command stops any ongoing activities:



performs Clear FIFO command



stops data transmission and reception



stops all timers, including FDT timer



clears IRQ line an IRQ status bits



stops Field ON commands

If Stop All Activities is received during RF collision avoidance, the field detection is

terminated and field is not set, consequently no interrupts are sent



stops automatic field ON (same as above)

Enter Transparent mode

Enters in Transparent mode

Measure power supply

Yes

Start General purpose

timer

Yes

Start Wake-up timer

Yes

All

except wu

Start Mask-receive timer

Starts the mask-receive timer and

squelch operation

Yes

Start No-response timer

Yes

Stop No-response timer

Yes

RFU

Not used

Enables R/W access to register

Space-B

Yes

all

Other

codes

RFU

Not used

1. Defines which Operation control register bits have to be set in order to accept a particular command.

2. Measure amplitude and Measure phase can be used directly from power down mode. In this case the command

temporarily enables the oscillator.

Table 11. List of direct commands (continued)

Code

(hex)

Name

Comments

Chaining

Interrupt after

termination

Operation

mode(1)

ST25R3918 Datasheet(PDF) 55 Page - STMicroelectronics

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