STW81101 datasheet(29/48 Pages) STMICROELECTRONICS

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STW81101

I2C bus interface

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6.3

I2C registers

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

6.3.1

Write-only registers

Table 16 gives a short description of the write-only registers.

FUNCTIONAL_MODE

The FUNCTIONAL_MODE register selects different functional modes for the STW81101

synthesizer according to

Table 17:

Table 16.

Write-only registers

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 17.

Functional modes 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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