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VT82C586B

PCI Integrated Peripheral Controller

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VT82C586B

Keyboard Controller Registers

The keyboard controller handles the keyboard and mouse

interfaces. Two ports are used: port 60 and port 64. Reads

from port 64 return a status byte. Writes to port 64h are

command codes (see command code list following the register

descriptions). Input and output data is transferred via port 60.

A “Control” register is also available. It is accessable by

writing commands 20h / 60h to the command port (port 64h);

The control byte is written by first sending 60h to the

command port, then sending the control byte value. The

control register may be read by sending a command of 20h to

port 64h, waiting for “Output Buffer Full” status = 1, then

reading the control byte value from port 60h.

Traditional (non-integrated) keyboard controllers have an

“Input Port” and an “Output Port” with specific pins dedicated

to certain functions and other pins available for general

purpose I/O. Specific commands are provided to set these pins

high and low. All outputs are “open-collector” so to allow

input on one of these pins, the output value for that pin would

be set high (non-driving) and the desired input value read on

the input port. These ports are defined as follows:

Bit Input Port

Lo Code Hi Code

0 P10 - Keyboard Data In

B0

B8

1 P11 - Mouse Data In

B1

B9

2 P12 - Turbo Pin (PS/2 mode only) B2

BA

3 P13 - user-defined

B3

BB

4 P14 - user-defined

B6

BE

5 P15 - user-defined

B7

BF

6 P16 - user-defined

–

–

7 P17 - undefined

–

–

Bit Output Port

Lo Code Hi Code

0 P20 - SYSRST (1=execute reset)

–

–

1 P21 - GATEA20 (1=A20 enabled) –

–

2 P22 - Mouse Data Out

B4

BC

3 P23 - Mouse Clock Out

B5

BD

4 P24 - Keyboard OBF Interrupt (IRQ1) –

–

5 P25 - Mouse OBF Interrupt (IRQ 12) –

–

6 P26 - Keyboard Clock Out

–

–

7 P27 - Keyboard Data Out

–

–

Bit Test Port

Lo Code Hi Code

0 T0 - Keyboard Clock In

–

–

1 T1 - Mouse Clock In

–

–

Note: Command code C0h transfers input port data to the

output buffer. Command code D0h copies output port values

to the output buffer. Command code E0h transfers test input

port data to the output buffer.

Port 60 - Keyboard Controller Input Buffer ................. WO

Only write to port 60h if port 64h bit-1 = 0 (1=full).

Port 60 - Keyboard Controller Output Buffer ................RO

Only read from port 60h if port 64h bit-0 = 1 (0=empty).

Port 64 - Keyboard / Mouse Status .................................. RO

0 Keyboard Output Buffer Full

0 Keyboard Output Buffer Empty............. default

1 Keyboard Output Buffer Full

1 Input Buffer Full

0 Input Buffer Empty................................ default

1 Input Buffer Full

2 System Flag

0 Power-On Default .................................. default

1 Self Test Successful

3 Command / Data

0 Last write was data write ....................... default

1 Last write was command write

4 Keylock Status

0 Locked

1 Free

5 Mouse Output Buffer Full

0 Mouse output buffer empty.................... default

1 Mouse output buffer holds mouse data

6 General Receive / Transmit Timeout

0 No error ................................................. default

1 Error

7 Parity Error

0 No parity error (odd parity received)..... default

1 Even parity occurred on last byte received

from keyboard / mouse

KBC Control Register .......... (R/W via Commands 20h/60h)

7 Reserved ........................................always reads 0

6 PC Compatibility

0 Disable scan conversion

1 Convert scan codes to PC format; convert 2-

byte break sequences to 1-byte PC-compatible

break codes ............................................ default

5 Mouse Disable

0 Enable Mouse Interface ......................... default

1 Disable Mouse Interface

4 Keyboard Disable

0 Enable Keyboard Interface .................... default

1 Disable Keyboard Interface

3 Keyboard Lock Disable

0 Enable Keyboard Inhibit Function......... default

1 Disable Keyboard Inhibit Function

2 System Flag ................................................default=0

This bit may be read back as status register bit-2

1 Mouse Interrupt Enable

0 Disable mouse interrupts ....................... default

1 Generate interrupt on IRQ12 when mouse data

comes in output bufer

0 Keyboard Interrupt Enable

0 Disable Keyboard Interrupts.................. default

1 Generate interrupt on IRQ1 when output buffer

has been written.

Revision 1.0 May 13, 1997

-22-

Register Descriptions

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