STS1TX datasheet(24/70 Pages) STMICROELECTRONICS

24 / 70 page

Operating modes

STS1TX

24/70

DocID025109 Rev 1

After TX completion, the possible destinations are:

•

TX, if the persistent-TX option is enabled in the PROTOCOL configuration registers

•

PROTOCOL, if some protocol option (e.g. automatic re-transmission) is enabled

•

READY, if TX is completed and no protocol option is in progress.

The SABORT command can always be used in TX state to break any deadlock condition

and the subsequent destination depends on STS1TX programming according to the

description above.

Commands are used in the STS1TX to change the operating mode, to enable/disable

functions, and so on. A command is sent on the SPI interface and may be followed by any

other SPI access without pulling CSn high.

The complete list of commands is reported in Table 19. Note that the command code is the

second byte to be sent on the MOSI pin (the first byte must be 0x80).

The commands are immediately valid after SPI transfer completion (i.e. no need for any

CSn positive edge).

7.1

Reset sequence

The STS1TX includes an automatic power-on reset (POR) circuit which generates an

internal RESETN active (low) level for a time TRESET after the VDD reaches the reset

Table 19. Commands list

Command

code

Command name

Execution state

Description

0x60

READY

Start to transmit

0x62

READY

STANDBY, SLEEP,

LOCK

Go to READY

0x63

STANDBY

READY

Go to STANDBY

0x64

SLEEP

READY

Go to SLEEP

0x66

LOCKTX

READY

Go to LOCK state by using the TX configuration of the

synthesizer

0x67

SABORT

Exit from TX state and go to READY state

0x68

LDC_RELOAD

All

Reload the LDC timer with the value stored in the

LDC_PRESCALER/COUNTER registers

0x69

SEQUENCE_UPDA

All

Reload the packet sequence counter with the value

stored in the PROTOCOL[2] register.

0x6A

AES Enc

All

Start the encryption routine

0x6B

AES Key

All

Start the procedure to compute the key for decryption

0x6C

AES Dec

All

Start decryption using the current key

0x6D

AES KeyDec

All

Compute the key and start decryption

0x70

SRES

All

Reset

0x72

FLUSHTXFIFO

All

Clean the TX FIFO

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