100
LCD PC E
LCD PC E
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8590 MAINTENANCE
8590 MAINTENANCE
1.7.3 Keyboard encoder Pins Definitions (2)
Name
Pin
H8 Pin
Definitions
During
RESET
After
RESET / OFF
system
ON
Function
PC0 20 INTKBD_CLK I I/O I/O PS2 Keyboard clock
PC1 21 INTKBD_DATA I I/O I/O PS2 Keyboard data
PC2 22 NC I O L
PC3 25 PWRBTN# I O H Low pulse
50ms when
trigger
When system in S3#/S4#/S5# press AV Keys on
keyboard and remote controller will send PWRBTN#
10ms low pulse no repeat and status for system
reading.
When system in S0 state Press Av Keys only send PS2
scan code.
PC4 26 IR module input I I Ready Ready Ready to received NEC 6121/2 IR protocol
Customer code: 00FF could receive remote controller
KBC type scan code.
PC5 27 System power
stateS0/S3#,S5#
I I L Connect to System power good. When system off only
some specific keys could generate PWRBTN# and
scan code to PS2 port
PC6 28 Remote controller block I I L Depends
AP
When not specification application running. Block
remote controller media key. Only AV Keys could
pass.
PC7 29 Keyboard
COVER_SW#
I Cover
close
Low
Cover
open
High
When Cover switch# stage change, send scan code.
Debounce 100 ms
PE0 23 KO16 O Scan
PE1 24 KO17 O Scan
Key matrix scan output
PE2 18 CAP LOCK# O L CAPs LOCK# LED, low turn on LED
PE3 19 NUM LOCK# O L NUM LOCK# LED, low turn on LED
PE4 34 SCROLL LOCK# O L Scroll LOCK# LED, low turn on LED
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