SPIRIT1 datasheet(28/94 Pages) STMICROELECTRONICS

28 / 94 page

Operating modes

SPIRIT1

28/94

Doc ID 022758 Rev 3

STANDBY, and LOCKRX/LOCKTX), which can be left only if any other command is used. All

other states are transient, which means that, in a typical configuration, the controller

remains in those states, at most for any timeout timer duration. Also the READY and LOCK

states behave as transients when they are not directly accessed with the specific commands

(for example, when LOCK is temporarily used before reaching the TX or RX states).

Note:

Response time SHUTDOWN to READY is ~650 µs.

READY state is the default state after the power-on reset event. In the steady condition, the

XO is settled and usable as the time reference for RCO calibration, for frequency synthesis,

and as the system clock for the digital circuits.

The TX and RX modes can be activated directly by the MCU using the TX and RX

commands, or automatically if the state machine wakes up from SLEEP mode and some

previous TX or RX is pending. The values are intend to a VCO manual calibration.

In LOCK state the synthesizer is in a locking condition(a). If LOCK state is reached using

either one of the two specific commands (LOCKTX or LOCKRX), the state machine remains

in LOCK state and waits for the next command. This feature can be used by the MCU to

perform preliminary calibrations, as the MCU can read the calibration word in the

RCO_VCO_CALIBR_OUT register and store it in a non-volatile memory, and after that it

requires a further tuning cycle.

When TX is activated by the TX command, the state machine goes into TX state and

remains there until the current packet is fully transmitted or, in the case of direct mode TX,

TXFIFO underflow condition is reached or the SABORT command is applied.

STATE[6:0] is a field of the register MC_STATE. All others values of STATE[6:0] are invalid.

Table 17.

States

STATE[6:0]

State/mode

Digital LDO

SPI

Xtal

Synth.

Wake-up

timer

Response time

to(1)

SHUTDOWN

OFF (register

contents lost)

Off

0x40

STANDBY

ON (FIFO and

contents

retained)

Off

125 µs

0x36

SLEEP

Off

125 µs

0x03

READY (Default)

Off

Don’t care

50 µs

0x0F

LOCK

Don’t care

0x33

Don’t care

15 µs

0x5f

Don’t care

15 µs

These values are crystal dependent. The values are referred to 52 MHz.

LOCK state is reached when one of the following events occurs first: lock detector assertion or locking timeout

expiration.

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