ST25R95 datasheet(25/61 Pages) STMICROELECTRONICS

25 / 61 page

On reception, bits [6:0] of the parity byte are zeroes; on transmission, bits [6:0] are ignored.

5.7

Listen command (0x05) description

In card emulation mode, this command waits for a command from an external reader.

Before sending this command, the application must select a protocol.

Table 19. Listen command description

Direction

Data

Comments

Example

Host to ST25R95

Command code 0x0500: Enters a Listening mode where the ST25R95 waits for a command from an external

reader.

Length of data

ST25R95 to Host

Result code

0x0000: No error. Confirmation that ST25R95 now is in Listening mode.

Length of data

ST25R95 to Host

Error code

0x8200: Invalid command length

Length of data

ST25R95 to Host

Error code

0x8300: Invalid protocol or protocol is not supported. For example, application selects protocol

ISO/IEC 15693 using command select protocol and then executes the Listen command. ISO/IEC

15693 is not supported in card emulation mode.

Length of data

ST25R95 to Host

Error code

0x8F00: No field. Command cannot be executed because there is no external field.

Length of data

After reception of the Listen command and the return of a ‘No error’ confirmation, the ST25R95 enters Listening

mode. The host controller has to use SPI Poll mode or IRQ_OUT pin to detect when a receive frame is available

in the ST25R95 buffer. The ST25R95 will exit Listening mode as soon it receives the Echo command (0x55) from

the Host Controller (MCU) or a command from an external reader (not including commands supported by the AC

filter command listed in Table 41. Commands to which the device is able to react).

In all cases, the ST25R95 will send data or an error code to the Host controller (MCU).

If no command from an external reader has been received, then the Echo command (0x55) must be used to exit

the Listening mode prior to sending a new command to the ST25R95. In response to the Echo command, the

ST25R95 sends 0x55 + 0x8500 (error code of the Listening state cancelled by the MCU).

Possible return codes are listed in Table 20. Response codes from the ST25R95 in Listening mode.

ST25R95

Listen command (0x05) description

DS12807 - Rev 4

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