Omega Vehicle Security OME-PIO-D56 manual I/O Port Location, Enabling I/O Operation

2.2I/O Port Location

The OME-PIO-D56/OME-PIO-D24 consists of one 24-bit bi-directional port, one

16bit input port and one 16 bit output port (only for OME-PIO-D56). The 24-bit port supports three 8-bit groups: PA, PB & PC. Each 8-bit group can be individually configured to function as either inputs or outputs. All groups using 24-bit bi- directional ports are configured as inputs upon power-up or reset. The I/O port locations are as follows:

Connector of	PA0 ~ PA7		PB0 ~ PB7	PC0 ~ PC7
OME-PIO-D56/D24
CON3 (DI/O)	Port0		Port1	Port2
Connector of OME-PIO-D56		Description
CON1		D/O
CON2		D/I

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

Note: PC0, PC1, PC2 and PC3 can be used as interrupt signal source. Refer to Sec. 2.4 for more information.

2.3Enabling I/O Operation

2.3.1DI/DO Port Architecture (CON3)

Upon power-up, all D/I/O port (CON3) operations are disabled. The RESET\ signal controls the enable/disable state of D/I/O port. Refer to Sec. 3.3.1 for more information about RESET\ signal. The power-up states are as follows:

•All D/I/O operations are disabled

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

•All D/O latch register are undefined.(refer to Sec. 2.3.2)

Initialization must be performed before using these D/I/Os. The recommended steps are as follows:

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

Step 2: Enable all D/I/O operations (refer to Sec. 3.3.1)

Step 3: Configure the three ports (in CON3) to their expected D/I/O state & send the initial value to all D/O ports (refer to Sec. 3.3.8)

Refer to DEMO1.C for demo program.

OME-PIO-D56/OME-PIO-D24 User Manual (Ver.2.1, Oct/2003) ---- 7