Silan

Semiconductors

SC84502

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

5

FUNCTION DESCRIPTIONS

1. OPERATING MODE

There are four operating modes in PS/2 mouse:

i) Reset Mode:

In this mode a self-test is initiated during power-on or by a Reset command. After reset signal, PS/2 mouse

will send:

1) Completion code AA&ID code 00.

2) Set default:

sampling rate: 100 reports/s

non-autospeed

stream mode

2 dot/count

disable

ii) Stream Mode:

The maximum rate of transfer is the programmed sample rate.

Data report is transmitted if

1) switch is pressed

2) movement has been detect

iii) Remote Mode:

Data is transmitted only in response to a Read Data command.

iv) Wrap Mode:

Any byte of data sent by the system, except hex EC(Reset wrap mode) or hex FF(Reset), is returned by

SC84502.

2. PS/2 MOUSE DATA REPORT

i) In stream mode: A data report is sent at the end of a sample interval.

ii) In remote mode: A data report is sent in response to Read Data command.

iii) Data report format: