EM84510

PS/2 SCROLLING MOUSE CONTROLLER

12

* This specification are subject to be changed without notice.

5.30.2001

TIMING DIAGRAM

(1) Photo-couples pulse width :

AC ELECTRICAL CHARACTERISTICS (T

Parameters

Sym.

Min.

Typ.

Max.

Unit

Oscillating Frequency (OSCR=51K

Ω)

Fosc

37.5-10%

37.5

37.5+10%

KHz

Key Debounce

Tkd

-

12

-

ms

Rising Edge Crossed Width Fosc=35 KHz

Tr

14.6

-

-

us

Falling Edge Crossed Width Fosc=35 KHz

Tf

14.6

-

-

us

Mouse CLK Active Time

Tmca

-

40

-

us

Mouse CLK Inactive Time

Tmci

-

40

-

us

Mouse Sample DATA from

Tmdc

-

13.3

-

us

CLK rising Edge

System CLK Active Time

Tsca

-

40

-

us

System CLK Inactive Time

Tsci

-

40

-

us

Time from DATA Transition to Falling Edge of CLK

Tsdc

-

13.3

-

us

Time from rising Edge of CLK to DATA Transition

Tscd

-

26.7

-

us

Time to mouse Inhibit after the 11th CLK to

Tpi

0

-

50

us

ensure mouse does not start another Transmission

PS. The AC timings are measured under using 35 KHz system clock signal.

(2) PS/2 Mouse

(A) Receiving DATA

X1 (Y1)

X2 (Y2)

Tr

Tf

• • • • •

• • • • • • • • •

• • •• • • • •

• •

CLK

DATA

Inhibit

1st

CLK

2nd

CLK

9th

CLK

10th

CLK

11th

CLK

Tmca

Tmci

Tmdc

Start

Bit

Bit0 -Bit7

Parity

Bit

Stop

Bit

Line

Control

Bit

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