W83977ATF Datasheet, PDF (205/207 Pages) Winbond – WINBOND I/O

6.4 Commands, continued
COMMAND
A4h
A5h
A6h
A7h
A8h
A9h
AAh
ABh
ADh
AEh
C0h
C1h
C2h
D0h
W83977ATF
PRELIMINARY
FUNCTION
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
BIT
BIT DEFINITION
00 No Error Detected
01 Auxiliary Device "Clock" line is stuck low
02 Auxiliary Device "Clock" line is stuck high
03 Auxiliary Device "Data" line is stuck low
04 Auxiliary Device "Data" line is stuck low
Self-test
Returns 055h if self test succeeds
Interface Test
BIT
BIT DEFINITION
00
No Error Detected
01
Keyboard "Clock" line is stuck low
02
Keyboard "Clock" line is stuck high
03
Keyboard "Data" line is stuck low
04
Keyboard "Data" line is stuck high
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
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Publication Release Date:April 1998
Revision 0.52