Hex Code

Command

Description

FF

Reset

This command cause the mouse to enter a reset mode and do an internal self-test.

FE

Resend

The system can send this command when it detects an error in any transmission

from the mouse. The Resend command could be sent following a mouse transmis-

sion and before the system enables the interface allowing the next mouse output.

On receipt of Resend, the mouse retransmits the previous three bytes if the previ-

ous output was a 3-byte packet. The previous two bytes if the previous output was a

2-byte packet, and the previous one byte if the previous output was a 1-byte packet,

unless the previous output from the mouse was a Resent command. In this case,

the mouse will resend the previous output prior to the Resend command. If a Re-

send command is received by the mouse from the host immediately following a

3-byte data packet transmission from the mouse to the host while the mouse is in

stream mode. The mouse should resend the 3-byte data packet prior to clearing the

count accumulators.

F6

Set default

This command reinitializes all conditions to the power-on default state.

F5

Disable

This command is used in the stream mode to stop transmissions initiated from the

mouse. It responds to all other commands while disabled. If the mouse is in the

stream mode, it must be disabled before sending it any command that requires a

response.

F4

Enable

Begin transmission, if in stream mode

F3, XX

Set sampling

rate

In the stream mode, this command sets the sampling rate to the value indicated by

bytes hex XX shown in the following figure:

Second Byte hex XX (sample rate): hex 0A (10/sec), hex 14 (20/sec),

hex 28 (40/sec), hex 3C (60/sec), hex 50 (80/sec), hex 64 (100/sec),

hex C8 (200/sec)

F2

Read device type

This command always receives a response of hex 00

HT6523

Rev. 1.20

4

March 6, 2003

The response must be within 20ms, unless the host

inhibits the mouse output or inhibits the data transmis-

sions from the system that require a response. If the

host initiates a command or data transmission and the

response is invalid or has a parity error, the host re-

transmits the command or data. If after two retries the

response is still invalid or has a parity error, the host

resets the mouse.

Data Format

The following data report format is valid for the stream

and remote modes and is 3 bytes long:

Byte

Bit

Description

3

2

1

7

6-1

0

7

6-1

0

7

6

5

4

3

2

1

0

MSB of Y Data

Y Data

LSB of Y Data

MSB of X Data

X Data

LSB of X Data

Y Data Overflow 1=Overflow

X Data Overflow 1=Overflow

Y Data sign 1=Negative

X Data sign 1=Negative

Reserved always=1

Reserved for middle Button

Right Button Status 1=Pressed

Left Button Status 1=Pressed

Commands

Hex Code

Command

FF

FE

F6

F5

F4

F3

F2

F0

EE

EC

EB

EA

E9

E8

E7

E6

Reset

Resend

Set default

Disable

Enable

Set sampling rate

Read device type

Set remote mode

Set wrap mode

Reset wrap mode

Read data

Set stream mode

Status request

Set resolution

Set scaling 2:1

Reset scaling