AT Keyboard/Mouse protocol

From HwB

(Difference between revisions)
 
(6 intermediate revisions by one user not shown)
Line 19: Line 19:
 
| 11  || Stopp bit    || Always 1
 
| 11  || Stopp bit    || Always 1
 
|}
 
|}
 +
 +
== Device to host ==
 +
[[Image:PCKeyboardMouse_1.svg]]
 +
 +
== Host to device ==
 +
[[Image:PCKeyboardMouse_2.svg]]
 +
 +
== Voltage levels ==
 +
{| {{border}}
 +
!          !! Min    !! Max
 +
|-
 +
| Low (0)  || 0.0 V  || 0.7 V
 +
|-
 +
| High (1) || 2.4 V  || 5.25 V
 +
|}
 +
 +
== Host to Keyboard commands ==
 +
 +
{| {{border}}
 +
! Byte !! Command                            !! Additional Data
 +
|-
 +
| 0xED || Set Status Indicators              || LED bitmask
 +
|-
 +
| 0xEE || Echo                                ||
 +
|-
 +
| 0xEF || Invalid Command                    ||
 +
|-
 +
| 0xF0 || Select Alternate Scan Codes        || Scan code set
 +
|-
 +
| 0xF1 || Invalid Command                    ||
 +
|-
 +
| 0xF2 || Read ID                            ||
 +
|-
 +
| 0xF3 || Set Typematic Rate/Delay            || Encoded rate/delay
 +
|-
 +
| 0xF4 || Enable                              ||
 +
|-
 +
| 0xF5 || Default Disable                    ||
 +
|-
 +
| 0xF6 || Set Default                        ||
 +
|-
 +
| 0xF7 || Set All Keys - Typematic            ||
 +
|-
 +
| 0xF8 || Set All Keys - Make/Break          ||
 +
|-
 +
| 0xF8 || Set All Keys - Make                ||
 +
|-
 +
| 0xFA || Set All Keys - Typematic/Make/Break ||
 +
|-
 +
| 0xFB || Set All Key Type - Typematic        || Scan code
 +
|-
 +
| 0xFC || Set All Key Type - Make/Break      || Scan code
 +
|-
 +
| 0xFD || Set All Key Type - Make            || Scan code
 +
|-
 +
| 0xFE || Resend                              ||
 +
|-
 +
| 0xFF || Reset                              ||
 +
|}
 +
 +
{| {{border}}
 +
! Bit  !! Typematic (Characters per second, ±20%)
 +
|-
 +
| 00000 || 30.0
 +
|-
 +
| 00001 || 26.7
 +
|-
 +
| 00010 || 24.0
 +
|-
 +
| 00011 || 21.8
 +
|-
 +
| 00100 || 20.0
 +
|-
 +
| 00101 || 18.5
 +
|-
 +
| 00110 || 17.1
 +
|-
 +
| 00111 || 16.0
 +
|-
 +
| 01000 || 15.0
 +
|-
 +
| 01001 || 13.3
 +
|-
 +
| 01010 || 12.0
 +
|-
 +
| 01011 || 10.9
 +
|-
 +
| 01100 || 10.0
 +
|-
 +
| 01101 || 9.2 
 +
|-
 +
| 01110 || 8.0 
 +
|-
 +
| 01111 || 8.0 
 +
|-
 +
| 10000 || 7.5
 +
|-
 +
| 10001 || 6.7
 +
|-
 +
| 10010 || 6.0
 +
|-
 +
| 10011 || 5.5
 +
|-
 +
| 10100 || 5.0
 +
|-
 +
| 10101 || 4.6
 +
|-
 +
| 10110 || 4.3
 +
|-
 +
| 10111 || 4.0
 +
|-
 +
| 11000 || 3.7
 +
|-
 +
| 11001 || 3.3
 +
|-
 +
| 11010 || 3.0
 +
|-
 +
| 11011 || 2.7
 +
|-
 +
| 11100 || 2.5
 +
|-
 +
| 11101 || 2.3
 +
|-
 +
| 11110 || 2.1
 +
|-
 +
| 11111 || 2.0
 +
|}
 +
 +
* Typematic rate: 10.9 characters per second (±20%)
 +
* Delay: 500 milliseconds (±20%)
 +
 +
== Keyboard to Host commands ==
 +
 +
{| {{border}}
 +
! Byte      !! Command
 +
|-
 +
| 0x00      || Key Detection Error/Overrun (Code Sets 2 and 3)
 +
|-
 +
| 0x83 0xAB || Keyboard ID
 +
|-
 +
| 0xAA      || BAT Completion Code
 +
|-
 +
| 0xFC      || BAT Failure Code
 +
|-
 +
| 0xEE      || Echo
 +
|-
 +
| 0xF0      || Break (key-up)
 +
|-
 +
| 0xFA      || Acknowledge (ACK)
 +
|-
 +
| 0xFE      || Resend
 +
|-
 +
| 0xFF      || Key Detection Error/Overrun (Code Set 1)
 +
|}
 +
 +
== Contributors ==
 +
* [[User:Joakim|Joakim Ögren]]
 +
 +
== Links ==
 +
* [http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=0650&db=man&fname=/usr/share/catman/a_man/cat7/pckeyboard.z SGI Techpubs Library: IRIX 6.5 pckeyboard(7)]
 +
* [http://www.electronic-engineering.ch/microchip/datasheets/kbd_spec.pdf Cherry keyboard G83-6000: Technical Specification]
 +
 +
== Sources ==
 +
* [http://www.networktechinc.com/ps2-prots.html NTI: PS/2 Keyboard & Mouse protocols]
  
 
[[Category:Information]]
 
[[Category:Information]]

Latest revision as of 06:49, 11 July 2007

Protocol used for:

Details:

  • Protocol is bi-directional
  • Clock frequency is 10-16.7 kHz
Bit Description Comment
1 Start bit Always 0
2-9 8 Data bits LSB first
10 Parity bit Odd parity
11 Stopp bit Always 1

Contents

Device to host

PCKeyboardMouse 1.svg

Host to device

PCKeyboardMouse 2.svg

Voltage levels

Min Max
Low (0) 0.0 V 0.7 V
High (1) 2.4 V 5.25 V

Host to Keyboard commands

Byte Command Additional Data
0xED Set Status Indicators LED bitmask
0xEE Echo
0xEF Invalid Command
0xF0 Select Alternate Scan Codes Scan code set
0xF1 Invalid Command
0xF2 Read ID
0xF3 Set Typematic Rate/Delay Encoded rate/delay
0xF4 Enable
0xF5 Default Disable
0xF6 Set Default
0xF7 Set All Keys - Typematic
0xF8 Set All Keys - Make/Break
0xF8 Set All Keys - Make
0xFA Set All Keys - Typematic/Make/Break
0xFB Set All Key Type - Typematic Scan code
0xFC Set All Key Type - Make/Break Scan code
0xFD Set All Key Type - Make Scan code
0xFE Resend
0xFF Reset
Bit Typematic (Characters per second, ±20%)
00000 30.0
00001 26.7
00010 24.0
00011 21.8
00100 20.0
00101 18.5
00110 17.1
00111 16.0
01000 15.0
01001 13.3
01010 12.0
01011 10.9
01100 10.0
01101 9.2
01110 8.0
01111 8.0
10000 7.5
10001 6.7
10010 6.0
10011 5.5
10100 5.0
10101 4.6
10110 4.3
10111 4.0
11000 3.7
11001 3.3
11010 3.0
11011 2.7
11100 2.5
11101 2.3
11110 2.1
11111 2.0
  • Typematic rate: 10.9 characters per second (±20%)
  • Delay: 500 milliseconds (±20%)

Keyboard to Host commands

Byte Command
0x00 Key Detection Error/Overrun (Code Sets 2 and 3)
0x83 0xAB Keyboard ID
0xAA BAT Completion Code
0xFC BAT Failure Code
0xEE Echo
0xF0 Break (key-up)
0xFA Acknowledge (ACK)
0xFE Resend
0xFF Key Detection Error/Overrun (Code Set 1)

Contributors

Links

Sources

Retrieved from "http://www.hardwarebook.info/index.php?title=AT_Keyboard/Mouse_protocol&oldid=8723"