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3.3.7 I/O Selection Control Register
(Write): wBase+0xcc
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 0 0 0 Port2 Port1 Port0
(Write): wBase+0xdc
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 0 0 0 Port5 Port4 Port3
(Write): wBase+0xec
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 0 0 0 Port8 Port7 Port6
(Write): wBase+0xfc
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 0 0 0 Port11 Port10 Port9
Note. Refer to Sec. 3.1 for more information about wBase.
Before using these D/I/O ports, user has to configure the state of ports as desired.
port?=1Æ this port is used as a D/O port
port?=0Æ this port is used as a D/I port
outportb(wBase+0xcc,0x03); /* set port0 as D/O ports */
/* set port1 as D/O ports */
/* set port2 as D/I ports */
outportb(wBase+0xdc,0x07); /* set port3 ~ port5 as D/O ports */
outportb(wBase+0xec,0x00); /* set port6 ~ port8 as D/I ports */
OME-PIO-D96 User Manual (Ver.1.1, Mar/2003) ---- 34