Pin Description

Pin No. Pin Name I/O

Description

USB Interface (2 pins)

3

USBD+/

CLK

I/O USB data plus or PS2 Clock, F/W auto-detect USBD+ for USB, CLK

for PS2

4

USBD-/

DATA

I/O USB data minus or PS2 Data, F/W auto-detect USB- for USB, DATA

for PS2

General purpose I/O (9 pins)

6, 7

X1, X2

I

X-axis photo input with built-in Holtek's special dynamic photo in-

put resistor

8, 9

Y1, Y2

I

Y-axis photo input with built-in Holtek's special dynamic photo in-

put resistor

10, 11

Z1, Z2

I

Z-axis input supports two kinds of scroller input; optomechanical

and mechanical

12, 13,

14

L, R, M

I

Input ports with pull-high resistor. These pads can function as Left,

Right and Middle button input lines.

Miscellaneous (7 pins)

1

VSS

¾ Negative power supply, ground.

2

V33O

O 3.3V voltage output

5

RESET

I

Chip reset input, low active

15

LED

I/O Drives LED output

16

VDD

¾ 5V positive power supply

17

OSC2

O 6MHz OSC output

18

OSC1

I

6MHz OSC input

HT82M98A

3

June 14, 2000