SPIRIT1 datasheet(73/94 Pages) STMICROELECTRONICS

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SPIRIT1

Doc ID 022758 Rev 3

73/94

This section describes all the registers used to configure the SPIRIT1. The description is

structured in sections according to the register usage.

SPIRIT1 has three types of registers:

●

Read and write (R/W), which can be completely managed by SPI using READ and

WRITE operations

●

Read-only (R)

●

Read-and-reset (RR), is automatically cleared after a READ operation.

A further category of special registers collects the ones which cannot be categorized in any

of the three mentioned above R/W, R, or RR.

The fields named as “Reserved” must not be overridden by the user, otherwise, behavior is

not guaranteed.

The memory map is shown in the following table:

Table 37.

General configuration registers

Address

Bit

Field name

Reset

R/W

Description

ANA_FUNC_CONF[1]

0x00

7:5

Reserved

000

R/W

4:2

GM_CONF[2:0]

011

Sets the driver gm of the XO at

startup

1:0

SET_BLD_LVL[1:0]

Sets the BLD threshold

00: 2.7 V

01: 2.5 V

10: 2.3 V

11: 2.1 V

ANA_FUNC_CONF[0]

0x01

Reserved

R/W

24_26MHz_SELECT

1: 26 MHz configuration

0: 24 MHz configuration

(impact only RCO calibration

reference and loop filter tuning)

AES_ON

1: AES engine enabled

EXT_REF

0: reference signal from XO

circuit

1: reference signal from XIN

Reserved

2BROWN_OUT

1: enables accurate brownout

detection

BATTERY_LEVEL

1: enables battery level

detector circuit

0TS

1: enables the “temperature

sensor” function

SPIRIT1 Datasheet(PDF) 73 Page - STMicroelectronics

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