STV-366-R01 datasheet(14/30 Pages) STMICROELECTRONICS

14 / 30 page

Operation

VT5366

14/30

Table 8.

Reg [#0x22]: Y_motion

Add

Bits

Name

R/W

Default

Description

0x22

[7:0]

Y_motion

0000_0000

This register holds the overall Y

movement data since last polling

was done.

Value is 8 bit 2’s complement.

Table 9.

Reg [#0x23] Overflow / No motion

Add

Bits

Name

R/W

Default

Description

0x23

[0]

X_overflow

This register records if the X -

motion integrator has reached its

limit.

[1]

Y_overflow

This register records if the Y -

motion integrator has reached its

limit.

[3]

No motion

Flag is set when there has been

no event at the moment the host

is polling for movement.

Table 10.

Reg [#0x27]: Motion Directions & Polarities

Add

Bits

Name

R/W

Default

Description

0x27

[0]

Invert X

R/W

Allows X to be inverted

[1]

Invert Y

Allows Y to be inverted

[3]

Swap X/Y

Replaces X with Y and Y with X

Table 11.

Reg [#0x29]: Minimum Features

Add

Bits

Name

R/W

Default

Description

0x29

[7:0]

Min_features[13:6]

R/W

0000_0000

This register represents the

feature threshold below which

motion is no longer valid. This is

linked to the value reported in

registers 0x31 & 0x32.

If Features [13:6] (reg0x31/32) <

Min features (0x29), then X/Y

motion = 0

Table 12.

Reg [#0x2A]: Motion resolution: Count/Inch

Add

Bits

Name

R/W

Default

Description

0x2A

[7:0]

Motion resolution

R/W

0000_1000

Sets Resolution as CPI:

0x8 - 400CPI

0x10 - 800 CPI

0x20 - 1600 CPI

0x40 - 3200 CPI

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