X-Y Displacements Packet; Packet Format For X-Y Displacements; Start Field For X-Y Displacement Packet - Motorola M68HC08 Designer Reference Manual

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5.3.4 X-Y Displacements Packet

High Data Rate Wireless USB Optical Mouse Solution

MOTOROLA

Freescale Semiconductor, Inc.

Figure 5-9

shows the packet format for X-Y displacements with the start field

illustrations in

Figure

5-10.

Start

X Displacement

START FIELD

Figure 5-9. Packet Format for X-Y Displacements

SYNC PATTERN AND PREAMBLE

Figure 5-10. Start Field for X-Y Displacement Packet

The X or Y displacement is represented in 2's complement and the checksum

byte is the sum of the X displacement, the Y displacement, and the stored ID

byte.

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Y Displacement

DATA FIELD

(12T PERIOD)

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Data Packet Format

Checksum

CHECKSUM FIELD

HEADER

(6T PERIOD)

DRM055

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