EM84520

2-IN-ONE SCROLLING MOUSE CONTROLLER

6

* This specification are subject to be changed without notice.

6.28.1999

Preliminary

Preliminary

Preliminary

Preliminary

Preliminary

c). The counter accumulators are cleared after receiving any command except “Resend”.

d). EM84520 receives a Resend command ( FE ), it transmit its last packet of data.

e). In the stream mode “Resend” is received by EM84520 following a 3-byte data packet transmission

to the system. EM84520 resend the 3-byte data packet prior to clearing the counter.

f).

A response is sent within 25 ms if

a). The system requires a response

b). An error is detected in the transmission

g). If EM84520 is in the stream mode :

a). The system disables EM84520 before issuing any command requiring a response.

b). When a command requiring a response is issued by the system ,another command should not be issue

until either the response is received or 25ms has passed.

E). PS/2 Mouse Commands Description:

There are 16 valid commands that transmits between the system and EM84520. The “FA” code is always the

first response to any valid input received from the system other than a Set Wrap Mode or Resend command.

The following table list the commands:

Hex Code

Command

EM84520 echo code

FF

Reset

FA,AA,00

FE

Resend

XX,(XX,XX)

F6

Set Default

FA

F5

Disable

FA

F4

Enable

FA

F3,XX

Set Sampling Rate

FA,FA

F2

Read Device Type

FA,00

F0

Set Remote Mode

FA

EE

Set Wrap Mode

FA

EC

Reset Wrap Mode

FA

EB

Read Data

FA,XX,XX,XX

EA

Set Stream Mode

FA

E9

Status Request

FA,XX,XX,XX

E8,XX

Set Resolution

FA,FA

E7

Set Auto-speed

FA

E6

Reset Auto-speed

FA

The following describes valid commands:

a). Reset ( FF )

EM84520 operation:

a). Completion the reset.

b). Transmitted FA, AA, 00 to the system.