Omega Engineering IOP-241 user manual Data Port B Control Register Base +

5.2Data Port B Control Register (Base + 1)

The Data Port B Control Register contains the control bits for I/O channels DATA8 - DATA15. Each I/O channel may be individually programmed for input by writing a '1' to the appropriate bit of this register.

Bit	Name	Description
7	DATA15	General Purpose I/O bit 15
6	DATA14	General Purpose I/O bit 14
5	DATA13	General Purpose I/O bit 13
4	DATA12	General Purpose I/O bit 12
3	DATA11	General Purpose I/O bit 11
2	DATA10	General Purpose I/O bit 10
1	DATA9	General Purpose I/O bit 9
0	DATA8	General Purpose I/O bit 8

Table 5-3. Data Port B Control Register

5.3Data Port C Control Register (Base + 2)

The Data Port C Control Register contains the control bits for I/O channels DATA16 - DATA23. Each I/O channel may be individually programmed for input by writing a '1' to the appropriate bit of this register. In addition, any of these eight I/O channels which are programmed for input may also be used to generate interrupts. In order to program an I/O channel as an interrupt source, the Port C Interrupt Enable Register must be set appropriately. The I/O channel must also be programmed for input by writing a '1' to the appropriate bit of the Data Port C Control Register.

Bit	Name	Description
7	DATA23/INT7	General Purpose I/O bit 23 and Interrupt Line 7
6	DATA22/INT6	General Purpose I/O bit 22 and Interrupt Line 6
5	DATA21/INT5	General Purpose I/O bit 21 and Interrupt Line 5
4	DATA20/INT4	General Purpose I/O bit 20 and Interrupt Line 4
3	DATA19/INT3	General Purpose I/O bit 19 and Interrupt Line 3
2	DATA18/INT2	General Purpose I/O bit 18 and Interrupt Line 2
1	DATA17/INT1	General Purpose I/O bit 17 and Interrupt Line 1
0	DATA16/INT0	General Purpose I/O bit 16 and Interrupt Line 0

Table 5-4. Data Port C Control Register

IOP-241 Users Manual 26