1
* This specification are subject to be changed without notice.
EM85000
APPLE DESKTOP BUS MOUSE CONTROLLER
11.6.1995
EM85000
APPLE DESKTOP BUS MOUSE CONTROLLER
GENERAL DESCRIPTION
The EMC ADB Mouse Controller is a mouse controller for apple mouse system.
The following functions are supported:
· Controller receives command or data from Host.
· Controller transmits data to Host.
FEATURES
· Two-button mouse and trackball controller.
· Key Lock function is available.
· Both photo discharge and non-discharge modes are available.
· Discharge mode can reduce X,Y DC offset level.
· Dynamic LEDs Control to reduce system power consumption.
· Four stages sample rate at 1KHz,2.5KHz,5KHz,10KHz.
· Include Noise Immunity methodology to avoid false entry.
· Operating frequence at 3.58MHz.
· 18 Pin DIP.
PIN ASSIGNMENTS
DISC
LLED
VDD
RESET
VSS
X1
X2
R
M
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
DIN
DOUT
OSCI
OSCO
VDD
DLED
LOCK
Y1
Y2
EM85000
* This specification are subject to be changed without notice.
EM85000
APPLE DESKTOP BUS MOUSE CONTROLLER
2
11.6.1995
PIN DESCRIPTIONS
Symbol
I/O
Function
DISC
I
H=discharge mode,L=non-discharge mode.(internal pull low)
LLED
O
Trackball lock led display.
V
DD
-
+5v power.
RESET
I
Low active for chip reset.
V
SS
-
GND.
X1,X2
I
Horizontal direction status for x counter data.
R
I
Right mouse key. (internal pull high)
M
I
Main mouse key. (internal pull high)
Y1,Y2
I
Vertical direction status for y counter data.
LOCK
I
Optional trackball key lock button to lock /M key. (internal pull high)
DLED
O
Active low to turn on photo LEDs.
OSCO
O
Crystal clock output.
OSCI
I
Crystal clock input.
DOUT
O
Transmit data to Host.(open drain)
DIN
I
Receive data or command from Host.
FUNCTION DESCRIPTIONS
The ADB Mouse Controller is communicated with Host by the ADB bus.Only Host sends command to mouse
controller,the mouse doesn't send any command to the other devices or Host on the bus.The signal of the data
or command is transmitted by asynchronous protocol.First,Host sends Attention and Sync signals to synchronize
all devices on the bus,then sends command or data according the command defined.
If the addess which the device receives in command is the same as the device address,then the device will execute
this command.If there are more then two devices to contend the ADB bus,then the bus collision will happen.
Therefore,every devices must have capability to detect and to solve collision.On the contrary,if the address in
the command is not the same with the address in the device,the device will discard the command,or sends SRQ
signal to Host when device has data to be send.
COMMANDS
COMMAND
B7 B6 B5 B4 B3 B2 B1 B0
DESCRIPTION
FLUSH
A3 A2 A1 A0
0
0
0
1
Mouse will clear all X,Y counter data(R0=0).
SENDRESET
-
-
-
-
0
0
0
0
Soft Reset(equal power-on reset).
TALK
A3 A2 A1 A0
1
1
Rh
Rl
Controller transmits data to Host.
LISTEN
A3 A2 A1 A0
1
0
Rh
Rl
Controller receives data from Host.
OTHER
- - - - - - - - - - - - - - - - - - - - - - - - -
Reserved command.
1.B7 ~ B4:Device Address(0~F)is the position of the device.(Ref table 2)
2.B0 ~ B1:Selected Register(R0~R3),each register has two bytes.
R0:Mouse counter data register(read only by Host)
R3:Control register(can be read or written by Host)
R1,R2:No use in mouse.
3.B3,B2=11:TALK command.(1 byte)
TALK R0:IF mouse has data to report,mouse will send two bytes (R0)to Host.
IF mouse has't data to report,Host will continue polling(R0) or execute other command.
TALK R3:Host can read mouse R3 register(2 bytes).
TALK R1,R2:No use in mouse.
3
* This specification are subject to be changed without notice.
EM85000
APPLE DESKTOP BUS MOUSE CONTROLLER
11.6.1995
4.B3,B2=10:LISTEN command.(3 bytes)
LISTEN R3:Host writes controll status to mouse R3.
LISTEN R0 ~R2:No use in mouse.
Host must send 3 bytes. (1 byte command and 2 bytes register data to mouse R3)
TABLE 1
DEVICE ADDRESS
Device Address
Device Type
Addressing
Example
0
Reserved
Extended
1
Appliances
Extended
2
Encoded Device
Movable
Keyboard address for initial address.
3
Relative Device
Movable
Mouse address for initial address.
4
Absolute Device
Movable
Tablet address for initial address.
5
Reserved
- - - - - - - - -
6
Reserved
- - - - - - - - -
7
Reserved
- - - - - - - - -
8 ~ F
Soft address
- - - - - - - - -
1. Device address=0~F.
2. Movable:Host can change device address to new address(ex:Soft,reserved address)by LISTEN R3command.
TABLE 2
DATA STRUCTURE
COMMAND
LENGTH
DEVICE ECHO
DESCRIPTION
SENDRESET
1 BYTE
NO
FLUSH
1 BYTE
NO
TALK R0
1 BYTE
2 BYTES
If mouse has data to report,device echoes two
bytes(R0) to Host,otherwise no echo data.
TALK R1
- - - - - - - - -
- - - - - - - - -
No use.
TALK R2
- - - - - - - - -
- - - - - - - - -
No use.
TALK R3
1 BYTE
2 BYTES
Device always echoes two bytes(R3) to Host.
LISTEN R0
- - - - - - - - -
- - - - - - - - -
No use.
LISTEN R1
- - - - - - - - -
- - - - - - - - -
No use.
LISTEN R2
- - - - - - - - -
- - - - - - - - -
No use.
LISTEN R3
3 BYTES
NO
Host sends control status (R3) to mouse.
First byte:command.
Second and last bytes:R3 control register.
1. CODE:First byte reference TABLE 1.
2. LISTEN R3 command reference TABLE 4.
TABLE 3
* This specification are subject to be changed without notice.
EM85000
APPLE DESKTOP BUS MOUSE CONTROLLER
4
11.6.1995
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.
5
* This specification are subject to be changed without notice.
EM85000
APPLE DESKTOP BUS MOUSE CONTROLLER
11.6.1995
3. Tit (200us)signal:If no collision has been detected,
LISTEN command:Device waiting until Tit="0" then device start to read data in.
TALK command:Device send two bytes data after Tit.
4. Stop bit("0").
5. Start bit("1").
6. Service Request:When the device has data to report with SRQ=1,it will pull the ADB bus to be low for 300us
after first stop bit of the command send by Host.
COLLISION:
1. Host send one command,but many devices respond to it.
2. Losing device:
a. Device detects "0" at Tit-time before device wants to send start bit.
b. Data line must hold "1" at Tit-time,but device detects "0" by another device send.
c. Device detects"0"while sending"1".
3. Losing device must give up ADB bus and data is saved.
4. Every devices must have detecting collision ability.
DYNAMIC SAMPLING RATE
When the mouse is moved,the frequence of sampling rate depends on the mouse's speed.If the mouse is still,the
sampling rate is at low speed(1KHz).It can reduce system power consumption.
DPI
DOTS
SPEED(cm/sec)
SAMPLING RATE
0
- - - - - - - - -
1KHz
1
2.54
2.5KHz
200
2
5.08
5KHz
4
10.16
10KHz
0
- - - - - - - - -
1KHz
1
1.5875
2.5KHz
320
2
3.175
5KHz
4
6.35
10KHz
0
- - - - - - - - -
1KHz
1
1.27
2.5KHz
400
2
2.54
5KHz
4
5.08
10KHz
0
- - - - - - - - -
1KHz
1
0.907
2.5KHz
560
2
1.814
5KHz
4
3.632
10KHz
Formula:speed=[ ( dots / DPI ) * 2.54 ) ] / Tb.
EX:dot=1,DPI=200 dots/inch,Tb(Time Base)=5ms
speed=[ ( 1 / 200 ) * 2.54 ] / 5ms=2.54 cm/sec
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