Interlink Electronics MicroModule PS2 - Manual (Page 13)

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11
PS2 MicroModule
Integration Guide
7.0 PS/2 Information
Communication from the host to the microprocessor is done via PS/2 and:
 Uses the PS/2 standard
 Is compatible with any PS/2 host
 Will attach as a standard 2 button mouse, or as a 3 button scroll mouse
The microprocessor reports data to the host at a rate of 50 reports/sec, regardless of host
attempts to change the report rate.
7.1 Data Packet
The data packet from the chip is organized as:
Byte 1
Bit
0 Left Button Status
1 Right Button Status
2 Always = 0 (Reserved for middle
button)
3 Always = 1
4 X data Sign, 1 = negative
5 Y data sign, 1 = negative
6 X data overflow, 1 = overflow
7 Y data overflow, 1 = overflow
Byte 2
Bit
0 LSB of X data
1 X data
2 X data
3 X data
4 X data
5 X data
6 X data
7 MSB of X data