18

Burst Mode Operation

Burst mode is a special serial port operation mode which

may be used to reduce the serial transaction time for

three predefined operations: motion read and SROM

download and frame capture. The speed improvement is

achieved by continuous data clocking to or from multiple

registers without the need to specify the register address,

and by not requiring the normal delay period between

data bytes.

Figure 22. Motion burst timing

Motion_Burst Register Address

Read First Byte

First Read Operation

Read Second Byte

SCLK

Read Third Byte

Motion Read

This mode is activated by reading the Motion_Burst

register. The ADNS-3090 will respond with the contents

of the Motion, Delta_X, Delta_Y, SQUAL, Shutter_Upper,

Shutter_Lower and Maximum_Pixel registers in that

order. After sending the register address, the micro-

data. All 56 data bits can be read with no delay between

bytes by driving SCLK at the normal rate. The data are

latched into the output buffer after the last address bit

is received. After the burst transmission is complete, the

to terminate burst mode. The serial port is not available

for use until it is reset with NCS, even for a second burst

transmission.

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PixArt Imaging Inc.

PixArt Imaging Inc.