ST25R100 datasheet(63/86 Pages) STMICROELECTRONICS

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Bit

Name

Default

Function

Comment

IC revision code

000: rev 1.0

001: rev 1.1

3-bit IC revision code

ic_rev0

5.14

Direct commands

Table 83. Direct commands

Code

(hex) (1)

Command

Comments

Chaining I_dct

Operation

mode

60, 61

Set default

Puts the ST25R100 into the power-up state

RD or PD

62, 63

Stop all activities

Stops all activities: transmission, reception, direct

commands execution, timers, clear FIFO, collision, and

IRQ status

Yes

64, 65

Clear FIFO

Clears FIFO and collision status

Yes

66, 67

Clear Rx gain

Clears the current squelch setting and loads the manual

gain reduction from the register

Yes

68, 69

Adjust regulators

Adjusts supply regulators according to the current supply

voltage level

Yes

6A, 6B

Transmit data

Starts a data transmit sequence

6C, 6D

Transmit EOF

Transmits an ISO15693 EOF (single modulation pulse)

70, 71

Mask receive data

Masks the receiver (incoming data after this command is

ignored)

Yes

72, 73

Unmask receive data

Unmasks the receiver (incoming data after this command

is normally processed)

Yes

74, 75

Calibrate WU

measurement

Calibrate the WU measurement

Yes

RD or PD

76, 77

Clear WU calibration

Clears previous calibration data

RD or PD

78, 79

WU measurement

The I and Q components of the RFI signal are measured

similarly as in WU mode

Yes

RD or PD

7A, 7B

I/Q measurement

The I and Q components of the RFI signal are measured

(with or without transmitter enabled)

Yes

7C, 7D

Sense RF

Senses RF signal presence on RFI inputs (with or

without transmitter enabled)

Yes

E0, E1

Transparent mode

Enter in Transparent mode

E2, E3

Start GPT

Manually starts the General purpose timer

E4, E5

Start WUT

Manually starts the wake up timer

PD or RD

E6, E7

Start MRT

Manually starts the Mask receive timer

E8, E9

Start NRT

Manually starts the No Response timer

EA, EB

Stop NRT

Manually stops the No response timer

Test Register access

Enable access to test registers

PD or RD

1. The command codes not explicitly listed cannot be used.

5.14.1

Set default

This direct command sets the device in the same state as power-up initialization:

•

Performs stop all activities command

•

Sets all registers to the default state

ST25R100

Application information

DS14139 - Rev 5

page 63/86

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