F81218
6.7.4 IRQ Channel Select Register – index 70h
Power-on default [7:0] = 0x0Bh when SOUT6/PS_238_IRQF is pull-up, else 0x00h.
Bit
7:6
Name
Reserved
R/W
R/W
R/W
Description
Return 0 when read.
5
URFIRQ_MODE
0 : PCI IRQ sharing mode.
1 : ISA IRQ sharing mode.
This bit is effective in IRQ sharing mode.
0 : IRQ is not sharing with other device.
1 : IRQ is sharing with other device.
4
URFIRQ_SHAR
R/W
3:0
SELURFIRQ[3:0] R/W
In LPC mode , select the Serial IRQ channel.
In ISA mode , select one of six IRQ pins .
03h : use serial IRQ channel 3 in LPC mode or use ISA_IRQA in ISA
mode.
04h : use serial IRQ channel 4 in LPC mode or use ISA_IRQB in ISA
mode.
05h : use serial IRQ channel 5 in LPC mode or use ISA_IRQC in ISA
mode.
09h : use serial IRQ channel 9 in LPC mode or use ISA_IRQD in ISA
mode.
0Ah : use serial IRQ channel 10 in LPC mode or use ISA_IRQE in
ISA mode.
0Bh : use serial IRQ channel 11 in LPC mode or use ISA_IRQF in
ISA mode.
Otherwise will disable the interrupt.
6.7.5 UART 6 Clock Select Register – index F0h
Power-on default [7:0] = 0x00h.
Bit
7:5
Name
Reserved
R/W
R/W
R/W
Description
Return 0 when read.
4
RS485
0: The RTS# is controlled by programming MCR[1]. (offset +4)
1: The RTS# is drive high when transmitting data and sink low when
receiving data.
3:2
Reserved
R/W
Return 0 when read.
-37-
August, 2007
V0.33P