VT82C686B
Index EE – Serial Port Configuration (00h) ...................RW
Index F0 – Parallel Port Control (00h)........................... RW
7
Serial Port 2 High Speed Enable
7
6
5
4
PS2 Type BiDirectionl Parallel Port
0
Disable ...................................................default
0
Disable................................................... default
1
Enable
1
Enable
6
Serial Port 1 High Speed Enable
EPP Direction by Register not by IOW
0
Disable ...................................................default
0
Disable................................................... default
1
Enable
1
Enable
5-3 Serial Port 2 Mode
000 Standard ................................................default
EPP+ECP
0
Disable................................................... default
001 IrDA (HIPSIR)
010 Amplitude shift keyed IR @ 500KHz
011 -reserved-
1xx -reserved-
Serial Port 2 Half Duplex
1
Enable
EPP Version
0
1
Version 1.9 ............................................ default
Version 1.7
........................................always reads 0
2
1
0
3-0 Reserved
0
Disable ...................................................default
1
Enable
Serial Port 2 TX Output Inversion
Index F1 – Serial Port Control (00h) .............................. RW
0
Disable ...................................................default
........................................always reads 0
IR Loop Back
7-6 Reserved
1
Enable
5
4
3
2
Serial Port 2 RX Input Inversion
0
Disable................................................... default
0
Disable ...................................................default
1
Enable
1
Enable
Serial Port 2 Power-Down State
0
Normal................................................... default
1
Tristate output in power down mode
Index EF – Power Down Control (00h)...........................RW
Serial Port 1 Power-Down State
........................................ always reads 0
Clock Power Down
0
Normal................................................... default
7-6 Reserved
1
Tristate output in power down mode
5
4
3
2
1
0
0
Normal operation ...................................default
IR Dedicated Pin (IRTX/IRRX) Select
1
Power Down
0
IRTX / IRRX Output from Serial Port 2......def
1
Function 0 Rx76[5] = 0:
Parallel Port Power Down
0
Normal operation ...................................default
IRRX output from dedicated pin D12
IRTX output from dedicated pin E12
1
Power Down
Serial Port 2 Power Down
1-0 Reserved
........................................always reads 0
0
Normal operation ...................................default
1
Power Down
Serial Port 1 Power Down
Index F2 – Test Mode (Do Not Program)....................... RW
Index F4 – Test Mode (Do Not Program)....................... RW
0
Normal operation ...................................default
1
Power Down
FDC Power Down
0
Normal operation ...................................default
1
Power Down
All Power Down
0
Normal operation ...................................default
1
Power Down All
Revision 1.71 June 9, 2000
-46-
Register Descriptions - Super-I/O I/O Ports
ETC [ ETC ]
