RX95HF Datasheet, PDF (22/44 Pages) STMicroelectronics – Near field communication transceiver for tag emulation

Commands
RX95HF
Note:
Default setting: from POR to Ready state
After power-on, the RX95HF enters Power-up state.
To wake up the RX95HF and set it to Ready state, the user must send a low pulse on the
IRQ_IN pin. The RX95HF then automatically selects the external interface (SPI) and enters
Ready state and is able to accept commSands after a delay of approximately 6 ms (t₃).
From Ready state to Hibernate state and back to Ready state
In Hibernate state, most resources are switched off to achieve an ultra-low power
consumption.
The only way the RX95HF can wake-up from Hibernate state is by an external event (low
pulse on pin IRQ_IN).
A basic Idle command is:
>>>0x07 0E 08 04 00 04 00 18 00 00 00 00 00 00 00 00
The Wake-up flag value is NOT significant when returning to Ready state from Hibernate
state or after a POR.
From Ready state to Sleep state and back to Ready state
Wake-up by external event (low pulse on IRQ_IN)
In Sleep or Power-up states, operating resources are limited in function of the selected
wake-up source to achieve a moderate power consumption level.
An Idle command example when wake-up source is pin IRQ_IN:
>>>0x07 0E 08 01 00 38 00 18 00 00 60 00 00 00 00 00
5.9
Read Register (RdReg) command (0x08) description
This command is used to read the Wakeup register.
Direction
Table 20. RDREG command description
Data
Comments
Example
Host to
RX95HF
RX95HF to
Host
0x08
Command code
0x03
Length of data
0x62 or 0x69 Register address
0x01
Register size
0x00
ST Reserved
0x00
Result code
<Len>
Length of data
<RegData> Register data
Ex 1. >>>0x0803690100
Reads the ACC_A register. ⁽¹⁾
<<<0x000127
See Section 5.10: Write Register (WrReg)
command (0x09) description for more
information on received register data.
RX95HF to
Host
0x82
0x00
Error code
Length of data
<<<0x8200 Invalid command length
1. This command must be preceded by the setting of the ACC_A register index (0x0903680004).
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