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EM85000

APPLE DESKTOP BUS MOUSE CONTROLLER

ELAN Microelectronics 

EM85000

APPLE DESKTOP BUS MOUSE CONTROLLER

LISTEN R3 COMMAND

CODE

DESCRIPTION

Listen SRQ Device

ID

R3 (B13) Address

Number

- - - - B15 ~ B8 B7~B0

3B - - - - - - - - FF

Self Test.

3B - - - - A3 A2 A1 A0 FE

Device will change to new address(A0~A3)if no collision

has been detected.

3B - - - - A3 A2 A1 A0 FD

Device will change to new address(A0~A3)if no collision

and /Mkey is pressed.

3B 0 1 - 1 A3 A2 A1 A0 00

IF no collision has been detected,device will change to

new address (A0~A3)and set (or clear)SRQ depend on B13(R3).

3B - - - - - - - - 01

2 counts/dot for X/Y axis.

3B - - - - - - - - 02

1 count/dot for X/Y axis.

1. LISTEN R3:Host transmits data to device.

2. IF mouse Address=3 and Command=Listen R3 then command data=3B.(Ref table 1)

3. B0 ~ B 15:R3 control register.

TABLE 4

REGISTER DESCRIPTION

REGISTER 0 (R0):mouse counter data.

B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

M Y6 Y5 Y4 Y3 Y2 Y1 Y0 R X6 X5 X4 X3 X2 X1 X0

1. X0 ~ X6:X direction counter data.

2. Y0 ~ Y6:Y direction counter data.

3. X6(Y6)=0:Positive count when mouse move to right(down).

X6(Y6)=1:Negative count when mouse move to left(up).

Negative count uses 2’S complement form.

4. R:When right key is pressed,B7 is cleared to zero,otherwise B7 status is set to one.

5. M:When main key is pressed,B15 is cleared to zero,otherwise B15 status is set to one.

REGISTER 3 (R3):control register.

B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

0 EE SRQ 1 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0

1. D0 ~ D7:Device Handler ID number. (00h ~ FFh)

2. A0 ~ A3:Device Address can be changed when host send LISTEN R3 command with ID=00,FE,FD.

3. B12:Always be“1”.

4. SRQ:Can be set or cleared when host send LISTEN R3 command with ID=00.

SRQ=1:Device can transmit data to Host.

SRQ=0:Device can’t transmit data to Host.

5. EE(Exception Event status):No use=1.

6. B15:Always be“0”.

SIGNAL PROTOCOL

1. Attn(800us)+Sync(65us):Synchronous signal.

Host out Attn+Sync signals to tell device when to get command code.

2. Data and command code:Data bit is discriminated by pulse code modulation.

* This specification are subject to be changed without notice.

11.6.1995 4

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