Omega Engineering OME-PIO-D96 manual I/O port Location, Enable I/O Operation

2.2I/O port Location

There are twelve 8-bit I/O ports in the OME-PIO-D96. Every I/O port can be programmed as D/I or D/O port. When the PC is first powered up, all twelve ports are used as D/I port. The I/O port location is given as follows:

Connector of OME-PIO-D96	PA0 ~ PA7	PB0 ~ PB7	PC0 ~ PC7
CN1	Port0	Port1	Port2
CN2	Port3	Port4	Port5
CN3	Port6	Port7	Port8
CN4	Port9	Port10	Port11

Refer to Sec. 2.1 for board layout & I/O port location.

Note: Each PC0 can be used as interrupt signal source. Refer to Sec. 2.5 for more information.

2.3Enable I/O Operation

When the PC is powered up, all D/I/O ports are disabled. The enable/disable of D/I/O is controlled by the RESET\ signal. Refer to Sec. 3.3.1 for more information about RESET\ signal. The power-up states are given as follows:

•All D/I/O operations are disabled

•All twelve D/I/O ports are configured as D/I port

•All D/O latch register are undefined.(refer to Sec. 2.4)

The user has to perform some initialization before using these D/I/Os. These recommended steps are given as follows:

Step 1: find address-mapping of PIO/PISO cards (refer to Sec. 3.1)

Step 2: enable all D/I/O operation (refer to Sec. 3.3.1)

Step 3: configure the first three ports to their expected D/I/O state & send the initial value to all D/O ports (refer to Sec. 3.3.7)

Step 4: configure the other three ports to their expected D/I/O state & send the initial value to all D/O ports(refer to Sec. 3.3.7)

Refer to DEMO1.C for demo program.

OME-PIO-D96 User Manual (Ver.1.1, Mar/2003) ---- 7