RX95HF datasheet(21/44 Pages) STMICROELECTRONICS

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RX95HF

Commands

5.8.1

Idle command parameters

The Idle command (Host to RX95HF) has the following structure (all values are

hexadecimal):

5.8.2

Optimizing wake-up conditions

Using the Wake-up source register, it is possible to cumulate sources for a wake-up event. It

is strongly recommended to always set an external event as a possible wake-up source.

To cumulate wake-up sources, simply set the corresponding bits in the Wake-up source

on a low pulse on pin IRQ_IN (bit 3 set to ‘1’), set the register to 0x0A.

5.8.3

Using various techniques to return to Ready state

The Idle command and reply set offers several benefits to users by enabling various

methods to return the RX95HF to Ready state. Some methods are nearly automatic, such

as waiting for a timer overflow or a field detection, but others consume more power

compared to the ones requesting a host action. A description of each method follows below.

RX95HF to

Host

0x82

Error code

<<<0x8200

Invalid command

length

0x00

Length of data

Table 17. IDLE command description (continued)

Direction

Data

Comments

Example

Table 18. Idle command structure

yy zz

Command

code

Data length

WU source

Enter Control

WU Control

Leave Control

Table 19. Summary of Idle command parameters

Parameter

Description

Command code

This byte is the command code. ‘07’ represents the Idle command. This

command switches the device from Active mode to WFE mode.

Data length

This byte is the length of the command in bytes. Its value depends on the

following parameter values.

WU Source

This byte defines the authorized wake-up sources in the Wake-up source

0x04

: Field Detector0x08: Low pulse on IRQ_IN

Enter Control

These two bytes (EnterCtrlL and EnterCtrlH) define the resources when

entering WFE mode.

0x0400

: Hibernate0x0142: Sleep (if Field Detector source is enabled)

WU Control

These two bytes (WuCtrlL and WuCtrlH) define the wake-up resources.

0x0400

: Hibernate

0x3800

: Sleep

Leave Control

These two bytes (LeaveCtrlL and LeaveCtrlH) define the resources when

returning to Ready state.

0x1800

: Hibernate

0x1800

: Sleep

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