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 Command
EM84502 echo code
FF
Reset
FA,AA,00
FE
F6
F5
F4
Resend
Set Default
Disable
Enable
XX,(XX,XX)
FA
FA
FA
F3,XX
F2
F0
Set Sampling Rate FA,FA
Read Device Type FA,00
Set Remote Mode FA
EE
Set Wrap Mode
FA
EC
EB
EA
E9
E8,XX
E7
Reset Wrap Mode FA
Read Data
FA,XX,XX,XX
Set Stream Mode
Status Request
Set Resolution
Set Autospeed
Reset Autospeed
FA
FA,XX,XX,XX
FA,FA
FA
E6
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.
6.18.1998
* This specification are subject to be changed without notice.
5
ELAN [ ELAN MICROELECTRONICS CORP ]
