w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 205

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

6.4 Commands, continued
COMMAND
AAh
ABh
ADh
AEh
C0h
C1h
C2h
D0h
A4h
A5h
A6h
A7h
A8h
A9h
Test Password
Returns 0Fah if Password is loaded
Returns 0F1h if Password is not loaded
Load Password
Load Password until a "0" is received from the system
Enable Password
Enable the checking of keystrokes for a match with the password
Disable Auxiliary Device Interface
Enable Auxiliary Device Interface
Interface Test
Self-test
Returns 055h if self test succeeds
Interface Test
Disable Keyboard Interface
Enable Keyboard Interface
Read Input Port(P1) and send data to the system
Continuously puts the lower four bits of Port1 into STATUS register
Continuously puts the upper four bits of Port1 into STATUS register
Send Port2 value to the system
BIT
00
01
02
03
04
BIT
00
01
02
03
04
No Error Detected
Auxiliary Device "Clock" line is stuck low
Auxiliary Device "Clock" line is stuck high
Auxiliary Device "Data" line is stuck low
Auxiliary Device "Data" line is stuck low
No Error Detected
Keyboard "Clock" line is stuck high
Keyboard "Clock" line is stuck low
Keyboard "Data" line is stuck low
Keyboard "Data" line is stuck high
BIT DEFINITION
BIT DEFINITION
- 101 -
FUNCTION
Publication Release Date:April 1998
W83977ATF
PRELIMINARY
Revision 0.52