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Fabricante

EM84502

PS/2 MOUSE CONTROLLER

ELAN Microelectronics 

EM84502

PS/2 MOUSE CONTROLLER

a). The system requires a response

b). An error is detected in the transmission

vii). 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 EM84502. 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

FF

FE

F6

F5

F4

F3,XX

F2

F0

EE

EC

EB

EA

E9

E8,XX

E7

E6

Command

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 Autospeed

Reset Autospeed

EM84502 echo code

FA,AA,00

XX,(XX,XX)

FA

FA

FA

FA,FA

FA,00

FA

FA

FA

FA,XX,XX,XX

FA

FA,XX,XX,XX

FA,FA

FA

FA

The following describes valid commands:

a). Reset ( FF )

EM84502 operation:

i). Completion the reset.

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

iii). Set default:

sampling rate: 100 reports/s

non-autospeed

stream mode

2 dots/count

disable

b). Resend ( FE )

i). Any time EM84502 receives an invalid command, it returns a Resend command to the system.

ii). When EM84502 receives a Resend command, it retransmits its last packet of data. If the last packet was

a Resend command, it transmits the packet just prior to the Resend command.

iii). In stream mode, if a Resend command is received by EM84502 immediately following a 3-byte data

packet transmission to the system.

* This specification are subject to be changed without notice.

6.18.1998 5

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