em84502 ELAN Microelectronics Corp, em84502 Datasheet - Page 9

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

TIMING DIAGRAM
(1) Photo-couples pulse width :
(2) PS/2 Mouse
* This specification are subject to be changed without notice.
AC ELECTRICAL CHARACTERISTICS (T
PS. The AC timings are measured under using 35 KHz system clock signal.
Oscillating Frequency
Key Debounce
Rising Edge Crossed Width Fosc=35 KHz
Falling Edge Crossed Width Fosc=35 KHz
Mouse CLK Active Time
Mouse CLK Inactive Time
Mouse Sample DATA from
CLK rising Edge
System CLK Active Time
System CLK Inactive Time
Time from DATA Transition to Falling Edge of CLK
Time from rising Edge of CLK to DATA Transition
Time to mouse Inhibit after the 11th CLK to
ensure mouse does not start another Transmission
Parameters
(A) Receiving DATA
X1 (Y1)
X2 (Y2)
CLK
DATA
Inhibit
Start
Bit
>
> <
Tmdc
Tmca
CLK
<
1st
• • • • • • • • •
Bit0 -Bit7
>
Tr
CLK
Tmci
2nd
<
• • •
CLK
9th
A
=0 C to 70 C)
• • • • •
Parity
Bit
Sym.
Fosc
Tkd
Tr
Tf
Tmca
Tmci
Tmdc
Tsca
Tsci
Tsdc
Tscd
Tpi
CLK
10th
Tf
Stop
Bit
34.3-10%
14.3
14.3
CLK
Min.
11th
0
-
-
-
-
-
-
-
-
Control
Line
Bit
34.3
42.9
42.9
14.3
42.9
42.9
14.3
28.6
Typ.
12
-
-
-
• • • • •
PS/2 MOUSE CONTROLLER
• •
34.3+10%
Max.
50
-
-
-
-
-
-
-
-
-
-
6.18.1998
EM84502
Unit
KHz
ms
us
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