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UR7HCDMP

HulaPoint™ - Ergonomic Mouse PS2/RS232 Encoder

Semtech Corporation 

USAR HulaCoderTM UR7HCDMP

Mature

mousecoderTM product

specifications

USAR Systems, Inc.

PS/2 Mode Commands

When the Reset Command

(FFh) is enacted, the UR7HCDMP

sets the following default

parameters: Incremental Stream

Mode, 1:1, scaling, disabled, and a

report rate of 100 Hz and then

sends AAh to the host followed by

a device ID of 00h.

The host sends the Resend Last

Data Stream Command (FEh)

when it detects an error in any

UR7HCDMP transmission. The

device then resends the last output

data stream to the host. This

transmission occurs after a USAR

HulaCoderTM transmission and

before the host enables the

interface allowing the next USAR

HulaCoderTM output.

The Set Default Status

Command (F6h) re-initializes the

device to its condition at power-up.

The Disable Command (F5h)

stops the device from transmitting

all reports. However, the mode

does not change; the HulaCoderTM

is still able to respond to

commands. If the Disable

Command is issued while the

device is transmitting a report, the

UR7HCDMP immediately stops the

transmission and disables itself.

If the USAR HulaCoderTM is in

Incremental Stream Mode, the

Enable Command (F4h) will allow it

to begin data transmission. If the

device is in Prompt Mode, the

Enable Command will update

the internal status of the USAR

HulaCoderTM, but will not allow the

device to transmit data to the host

either while it is moving or when a

button is depressed.

PS/2 Data Format

The following table shows the data report format. Values are expressed in a

Two’s Complement Format with a separate sign bit. If there is an overflow

of the accumulator, the maximum positive or negative count is reported and

the corresponding overflow bit is set.

Byte 1

b0

b1

b2

b3

b4

b5

b6

b7

Byte 2

b0

b1

b2

b3

b4

b5

b6

b7

Byte 3

b0

b1

b2

b3

b4

b5

b6

b7

Left Button status

Right Button Status

Middle Button Status

Always = 1

X data sign

Y data sign

X data overflow

Y data overflow

X0: LSB of X data

X1

X2

X3

X4

X5

X6

X7: MSB of X data

Y0: LSB of Y data

Y1

Y2

Y3

Y4

Y5

Y6

Y7: MSB of Y data

Status Report Format Table

1 = depressed

1 = depressed

1 = depressed

1 = negative

1 = negative

1 = overflow

1 = overflow

Byte 1

b0

b1

b2

b3

b4

b5

b6

b7

Byte 2

Byte 3

Right Button

1 = depressed

Middle Button

1 = depressed

Left Button

1 = depressed

Always = 0

Scaling - 1:1 (0) / 2:1 (1)

Disable - (0) / enable (1)

Stream - (0) / prompt (1) mode

Always = 0

b0 - 1 Current resolution setting

b2 - 7 Always = 0

b0-7 Current sampling rate

USAR Datasheet

DOC7-DMP-DS-102

4

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