VD6640 datasheet(31/126 Pages) STMICROELECTRONICS

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DocID023597 Rev 11

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VG6640, VD6640

Control interface

125

4.1.2

Valid register data types

The contents of the registers can represent a number of different data types (see Table 5).

The register map uses this coding to help with the interpretation of the contents of each

Table 5. Valid register data types

Data

type

Name

Range

Description

8UI

8-bit unsigned integer

0 to 255

8SI

8-bit signed integer

-128 to 127

Two’s complement notation

16UI

16-bit unsigned integer 0 to 65535

16SI

16-bit signed integer

-32768 to 32767

Two’s complement notation

16UR

16-bit unsigned iReal

0 to

255.99609375

08.08 fixed point number. 8 integer bits (MS

Byte), 8 fractional bits (LS Byte)

16SR

16-bit signed iReal

-128 to

127.9960375

Two’s complement notation, 8 fractional bits

32UR

32-bit unsigned iReal

0 to

65535.99998474

16.16 fixed point number. 16 integer bits

(MS 2 Bytes), 16 fractional bits (LS 2 Bytes)

32SR

32-bit signed iReal

-32768 to

32767.99998474

Two’s complement notation,16 fractional

bits

32SF

32-bit IEEE floating-

point number

As per IEEE 754

As per IEEE 754. 1 sign bit, 8 exponent

bits, 23 fractional bits

8C or

16C

8-bit or 16-bit Coded

This indicates that the value is decoded to

select one of several functions or modes.

8B or

16B

8 or 16 bits

Each bit represents a specific function or

mode.

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