STS1TX datasheet(57/70 Pages) STMICROELECTRONICS

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STS1TX

GPIO1_CONF

0x04

7:3

GPIO_SELECT[4:0]

10100

R/W

GPIO1 configuration (default:

digital GND)

2Reserved

1:0

GPIO_MODE

GPIO1 mode:

01b: digital input

10b: digital output low power

11b: digital output high power

(default: digital output low

power)

GPIO0_CONF

0x05

7:3

GPIO_SELECT[4:0]

00001

R/W

GPIO0 configuration (default:

power-on reset signal)

2Reserved

1:0

GPIO_MODE

GPIO0 mode:

00b: analog

01b: digital input

10b: digital output low power

11b: digital output high power

(default: digital output low

power)

MCU_CK_CONF

0x06

EN_MCU_CLK

R/W

1: The internal divider logic is

running, so the MCU clock is

available (but proper GPIO

configuration is needed)

6:5

CLOCK_TAIL[1:0]

Number of extra clock cycles

provided to the MCU before

switching to STANDBY state:

00: 0 extra clock cycle

01: 64 extra clock cycles

10: 256 extra clock cycles

11: 512 extra clock cycles

4:1

XO_RATIO[3:0]

Divider for the XO clock output

RCO_RATIO

Divider for the RCO clock

output

0: 1

1: 1/128

XO_RCO_TEST

0xB4

7:4

Reserved

0010

PD_CLKDIV

1: disable both dividers of the

digital clock (and reference

clock for the SMPS) and IF-

ADC clock.

2:0

Reserved

001

Table 34. General configuration registers (continued)

Address

Bit

Field name

Reset

R/W

Description

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