Product specifications

VT1211 LPC SuperIO and Hardware Monitor
Revision 1.0 January 8, 2002 -25- Register Descriptions – LDN 2/3 Serial Ports
Technologies, Inc.
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Serial Port 1 Registers (LDN 2)
Offset 30 – Serial Port 1 Activate ....................................RW
7-1 Reserved ........................................ always reads 0
0 Serial Port 1 Function
0 Disable ...................................................default
1 Enable
Offset 60 – Serial Port 1 Base Address (FEh).................RW
7-1 ADR9 ~ ADR3........................... default = 1111 111b
0Mustbe0......................…...……..………default = 0
Offset 70 – Serial Port 1 IRQ Select (04h) ......................RW
7-4 Reserved (RO)…................................ always reads 0
3-0 Serial Port 1 IRQ Select ........................ def = 0100b
Offset F0 – Serial Port 1 Control.....................................RW
7-4 Must be 0 .............................................. default = 0
3 Serial Port 1 Output Pin Tri-State in Power Down
0 Disable ...................................................default
1 Enable
2 Reserved ........................................ always reads 0
1 Serial Port 1 High Speed
0 Disable ...................................................default
1 Enable
0 Serial Port 1 MIDI
0 Disable ...................................................default
1 Enable
Serial Port 2 Registers (LDN 3)
Offset 30 – Serial Port 2 Activate................................... RW
7-1 Reserved ........................................always reads 0
0 Serial Port 2 Function
0 Disable................................................... default
1 Enable
Offset 60 – Serial Port 2Base Address (BEh)................. RW
7-1 ADR9 ~ ADR3 ...........................default = 1011 111b
0Mustbe0.............................................. default = 0
Offset 70 – Serial Port 2 IRQ Select (03h)..................... RW
7-4 Reserved (RO) ....................................always reads 0
3-0 Serial Port 2 IRQ Select................... default = 0011b
Offset F0 – Serial Port 2 Control .................................... RW
7-4 Must be 0
3 Serial Port 2 Output Pin Tri-State in Power Down
0 Disable................................................... default
1 Enable
2 Reserved …. ...................................always reads 0
1 Serial Port 2 High Speed
0 Disable................................................... default
1 Enable
0 Serial Port 2 MIDI
0 Disable................................................... default
1 Enable