8

I/O Specifications

PS/2 Command Set Implementation

The following commands are implemented. All other commands will cause an FE (resend) response from the

ADNS-2001. A second invalid command will cause an FC (error) response from the ADNS-2001.

Valid Values

Hex Command

Mnemonics for

and Default Value

Mnemonic for

and Response

Command and

after Software or

Command

Bytes

Response Bytes

Description

Hardware Reset

RESET

FF FA AA 00

FF ACK ID DT

Soft reset ID = AA, DT = 0

RESEND

FE nn...

FE nn...

Resend last byte (i.e., ACK)

or packet

SET_DFS

F6 FA

F6 ACK

Default setting

DISABLE

F5 FA

F5 ACK

Disable stream mode

(default mode)

ENABLE

F4 FA

F4 ACK

Enable stream mode

SET_SAMPLING

F3 FA nn FA

F3 ACK nn ACK

Set sampling rate

(0A 14 28 3C 50 64 C8)

10 20 40 60 80 100 120

reports/second

READ_DT

F2 FA 00

F2 ACK DT

Responds with DT = 00

ECHO

EE FA

EE ACK

Echo all further commands

until NO_ECHO or RESET

NO_ECHO

EC FA

EC ACK

Respond to following

commands normally

READ_DATA

EB FA nn nn nn

EB ACK nn nn nn

Request a data packet

See IBM PS/2 Mouse

Technical Reference

SET_STREAM

EA FA

EA ACK

Respond with data packets

(default mode)

at the sample rate

SET_PROMPT

F0 FA

F0 ACK

Data only sent on

READ_DATA

STATUS

E9 FA nn nn nn

E9 ACK nn nn nn

Request status packet

See IBM PS/2 Mouse

Technical Reference

SET_SCALE

E7 FA

E7 ACK

Pseudo log

LIN_SCALE

E6 FA

E6 ACK

Linear

(default mode)

SET_RES

E8 FA nn FA

E8 ACK nn ACK

Set resolution

(00 01 02 03)

2 4 8 16 counts/mm)

DISABLE_TEST

E8 FA AA FA

E8 ACK AA RESEND

For test purposes only

Default mode after

hardware reset