VS6724 datasheet(51/118 Pages) STMICROELECTRONICS

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VS6724

Programming model and register description

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4.2

4.2.1

Registers not listed in this datasheet should be considered as reserved or read-only should

NOT be written to, as this may cause unpredictable results.

The VS6724 I²C write address is 0x20.

All I²C locations contain an 8-bit byte. However, certain parameters require 16 bits to

represent them and are therefore stored in more than 1 location.

Note:

For all 16 bit parameters the MSB register must be written before the LSB register.

The data stored in each location can be interpreted in different ways as shown below.

Table 7.

Float number format

Float 900 is used in ST co-processors to represent floating point numbers in 2 bytes of data.

It conforms to the following structure:

Bit[15] = Sign bit (1 represents negative)

Bit[14:9] = 6 bits of exponent, biased at decimal 31

Bit[8:0] = 9 bits of mantissa

Table 6.

Prefix

Description

VP_BYTE = ub

One Byte unsigned data

VP_UINT16 = uw

Two Byte unsigned data

Flag_e(F) = f

One byte data. Only two possible values

Enum = e

One Byte data. Specific to module

VP_FLOAT = fl

Two byte data. Expect value in Floating Point 16 notation

VP_INT8 = sb

One Byte signed data

Table 7.

Data type

Description

BYTE

Single field register 8 bit parameter

UINT_16

Multiple field registers - 16 bit parameter

FLAG_e

Bit 0 of register must be set/cleared

CODED

Coded register - function depends on value written

FLOAT

Float Value

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