STS1TX datasheet(56/70 Pages) STMICROELECTRONICS

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STS1TX

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DocID025109 Rev 1

ANA_FUNC_CONF[0]

0x01

7Reserved

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

3Reserved

2BROWN_OUT

1: enables accurate brownout

detection

BATTERY_LEVEL

1: enables battery level

detector circuit

0TS

1: enables the “temperature

sensor” function

GPIO3_CONF

0x02

7:3

GPIO_SELECT[4:0]

10100

R/W

GPIO3 configuration (default:

digital GND)

2Reserved

1:0

GPIO_MODE[1:0]

GPIO3 mode:

01b: digital input

10b: digital output low power

11b: digital output high power

(default: digital output low

power)

GPIO2_CONF

0x03

7:3

GPIO_SELECT[4:0]

10100

R/W

GPIO2 configuration (default:

digital GND)

2Reserved

1:0

GPIO_MODE

GPIO2 mode:

01b: digital input

10b: digital output low power

11b: digital output high power

(default: digital output low

power)

Table 34. General configuration registers (continued)

Address

Bit

Field name

Reset

R/W

Description

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