30

Frame_Capture

Address: 0x12

Access: R/W

Reset Value: 0x00

Bit

76543210

Field

FC7

FC6

FC5

FC4

FC3

FC2

FC1

FC0

Data Type: 8-bit unsigned integer

USAGE:

Used to capture the next available complete 1 frame of pixel values to be stored to RAM. Writing to this

register will cause any firmware loaded to be overwritten and stops navigation. A hardware reset and SROM

download are required to restore normal operation for motion reading. Refer to Frame Capture section for

use details.

SROM_Enable

Address: 0x13

Access: W

Reset Value: Undefined

Bit

76543210

Field

SE7

SE6

SE5

SE4

SE3

SE2

SE1

SE0

Data Type: 8-bit unsigned integer

USAGE:

Write to this register to start either SROM download or SROM CRC test. See SROM Download section for use

details.

SROM CRC test can be performed to check for successful SROM download. SROM CRC test is only valid after

SROM downloaded. Navigation is halted and the SPI port should not be used during this SROM CRC test.

PixArt recommends reading the MOTION register to determine the laser fault condition before performing

the SROM CRC test. In the case of a laser fault condition,

PixArt recommends to reset the sensor.

SROM CRC test procedure is as below:

1. Write 0x15 to SROM_Enable register to start SROM CRC test.

2. Wait for at least 10ms.

3. Read the CRC value from Data_Out_Lower and Data_Out_Upper registers.

Note: After the SROM CRC test completed, laser power need to be enabled again to resume the navigation

by setting bit (Bit-0) of LASER_CTRL0 register to 0.

Run_Downshift

Address: 0x14

Access: R/W

Reset Value: 0x7d

Bit

76543210

Field

RD7

RD6

RD5

RD4

RD3

RD2

RD1

RD0

Data Type: 8-bit unsigned integer

USAGE:

This register set the Run to Rest 1 downshift time. Default value is 470ms. Use the formula below for

calculation.

Run Downshift time (ms) = RD[7:0] x 3.75

Default = 125 x 3.75 = 470ms

All the above values are calculated base on system clock, which expected to have 20% tolerance.

PixArt Imaging Inc.

Track-on-Glass Laser Sensor

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PixArt Imaging Inc.