ST95HF datasheet(32/93 Pages) STMICROELECTRONICS

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Commands

ST95HF

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For more detailed examples of use with NFC Forum and ISO/IEC 15693 tags, refer to

Appendix D on page 69.

If Parity Framing mode is used, the parity bit stays unchanged. On transmission, it is not

encoded and on reception it is not decoded. The length of Data must be even. Each data

byte is accompanied by an additional byte which encodes the parity:

<DataByte>, <Parity>, <DataByte>, <Parity> …

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.

After reception of the LISTEN command and the return of a ‘No error’ confirmation, the

ST95HF 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 ST95HF buffer. The ST95HF 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

ACFILTER command listed in Table 42).

In all cases, the ST95HF will send data or an error code to the Host controller (MCU).

Table 19. Structure of Parity byte

Bit

Description

Parity bit

[6:0]

Reserved for future use

Table 20. LISTEN command description

Direction

Data

Comments

Example

Host to

ST95HF

Command code

0x0500

: Enters a Listening mode where the

ST95HF waits for a command from an external

reader.

Length of data

ST95HF to

Host

Result code

0x0000

: No error. Confirmation that ST95HF

now is in Listening mode.

Length of data

ST95HF to

Host

Error code

0x8200

: Invalid command length

Length of data

ST95HF 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

ST95HF to

Host

Error code

0x8F00

: No field. Command cannot be

executed because there is no external field.

Length of data

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