w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 107

• Manufacturer Part Number: w83977atg
• Description: W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
• Manufacturer: Winbond Electronics Corp America

9.3
The status register is an 8-bit read-only register at I/O address 64H (Default, PnP programmable I/O
address LD5-CR62 and LD5-CR63), that holds information about the status of the keyboard controller
and interface. It may be read at any time.
9.4
BIT
0
1
2
3
4
5
6
7
Status Register
Commands
COMMAND
20h
60h
Output Buffer Full
Input Buffer Full
System Flag
Command/Data
Inhibit Switch
Auxiliary Device Output
Buffer
General Purpose Time-
out
Parity Error
BIT FUNCTION
Read Command Byte of Keyboard Controller
Write Command Byte of Keyboard Controller
BIT
7
6
5
4
3
2
1
0
Disable Auxiliary Device
Reserved
Disable Keyboard
Reserve
System Flag
Enable Auxiliary Interrupt
IBM Keyboard Translate Mode
Enable Keyboard Interrupt
0: Output buffer empty
1: Output buffer full
0: Input buffer empty
1: Input buffer full
This bit may be set to 0 or 1 by writing to the system flag
bit in the command byte of the keyboard controller. It
defaults to 0 after a power-on reset.
0: Data byte
1: Command byte
0: Keyboard is inhibited
1: Keyboard is not inhibited
0: Auxiliary device output buffer empty
1: Auxiliary device output buffer full
0: No time-out error
1: Time-out error
0: Odd parity
1: Even parity (error)
BIT DEFINITION
- 99 -
W83977ATF/W83977ATG
FUNCTION
DESCRIPTION
Publication Release Date: May 2006
Revision 0.6