STW81101ATR datasheet(25/42 Pages) STMICROELECTRONICS

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STW81101

I2C bus interface

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5.3

I2C registers

STW81101 has 6 write-only registers and 1 read-only register.

The following table gives a short description of the write-only registers list.

5.3.1

FUNCTIONAL_MODE

FUNCTIONAL_MODE register is used to select different functional mode for the STW81101

synthesizer according to the following table:

Table 15.

Write-only registers list

HEX CODE

DEC CODE

DESCRIPTION

0x00

FUNCTIONAL_MODE

0x01

B_COUNTER

0x02

A_COUNTER

0x03

REF_DIVIDER

0x04

CONTROL

0x05

CALIBRATION

MSB

LSB

PD6

PD5

PD4

PD3

PD2

PD1

PD0

B11

Table 16.

Different functional mode of the FUNCTIONAL_MODE register

Decimal value

Description

Power down mode

Enable VCO A, output frequency divided by 2

Enable VCO B, output frequency divided by 2

Enable external VCO, output frequency divided by 2

Enable VCO A, output frequency divided by 4

Enable VCO B, output frequency divided by 4

Enable external VCO, output frequency divided by 4

Enable VCO A, direct output

Enable VCO B, direct output

Enable external VCO, direct output

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