em84502 ELAN Microelectronics Corp, em84502 Datasheet - Page 5

• Manufacturer Part Number: em84502
• Description: Ps/2 Mouse Encoder
• Manufacturer: ELAN Microelectronics Corp

* This specification are subject to be changed without notice.
E). PS/2 Mouse Commands Description:
a). Reset ( FF )
b). Resend ( FE )
iii). Set default:
iii). In stream mode, if a Resend command is received by EM84502 immediately following a 3-byte data
ii). Transmitted FA,AA,00 to the system.
ii). When EM84502 receives a Resend command, it retransmits its last packet of data. If the last packet was
vii). When a command requiring a response is issued by the system ,another command should not be issue
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:
The following describes valid commands:
i). Completion the reset.
i). Any time EM84502 receives an invalid command, it returns a Resend command to the system.
a). The system requires a response
b). An error is detected in the transmission
Hex Code
EM84502 operation:
sampling rate: 100 reports/s
non-autospeed
stream mode
2 dots/count
disable
a Resend command, it transmits the packet just prior to the Resend command.
packet transmission to the system.
until either the response is received or 25ms has passed.
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
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
EM84502 echo code
PS/2 MOUSE CONTROLLER
6.18.1998
EM84502
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