em84502 ELAN Microelectronics Corp, em84502 Datasheet - Page 3

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

* This specification are subject to be changed without notice.
B). PS/2 Mouse Data Report:
C) PS/2 mouse Data Transmission:
i). EM84502 generates the clocking signal when sending data to and receiving data from the system.
ii). The system requests EM84502 receive system data output by forcing the DATA line to an inactive
iii). Data transmission frame:
ii). Stream Mode:
iii). Remote Mode:
iv). Wrap Mode:
i). In stream mode: A data report is sent at the end of a sample interval.
ii). In remote mode: A data report is sent in response to Read Data command.
iii). Data report format:
The maximum rate of transfer is the programmed sample rate.
Data report is transmitted if
Data is transmitted only in response to a Read Data command.
Any byte of data sent by the system, except hex EC ( Reset wrap mode ) or hex FF ( Reset ), is returned
by EM84502.
level and allowing CLK line to go to an active level.
2). Set default:
1). switch is pressed
2). movement has been detect
sampling rate: 100 reports/s
non-autospeed
stream mode
2 dot/count
disable
Byte
1
2
3
Bit
0
1
2
3
4
5
6
7
0-7
0-7
Right button status; 1 = pressed
Middle button status; 1 = pressed
Reserve
X data sign; 1 = negative
Y data sign; 1 = negative
X data overflow; 1 = overflow
Y data overflow; 1 = overflow
Left button status; 1 = pressed
X data ( D0 - D7 )
Y data ( D0 - D7 )
Description
PS/2 MOUSE CONTROLLER
6.18.1998
EM84502
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