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5.2 Data 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.

General Purpose I/O bit 8

DATA8

General Purpose I/O bit 9

DATA9

General Purpose I/O bit 10

DATA10

General Purpose I/O bit 11

DATA11

General Purpose I/O bit 12

DATA12

General Purpose I/O bit 13

DATA13

General Purpose I/O bit 14

DATA14

General Purpose I/O bit 15

DATA15

DescriptionNameBit

Table 5-3. Data Port B Control Register

5.3 Data 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.

General Purpose I/O bit 16 and Interrupt Line 0

DATA16/INT0

General Purpose I/O bit 17 and Interrupt Line 1

DATA17/INT1

General Purpose I/O bit 18 and Interrupt Line 2

DATA18/INT2

General Purpose I/O bit 19 and Interrupt Line 3

DATA19/INT3

General Purpose I/O bit 20 and Interrupt Line 4

DATA20/INT4

General Purpose I/O bit 21 and Interrupt Line 5

DATA21/INT5

General Purpose I/O bit 22 and Interrupt Line 6

DATA22/INT6

General Purpose I/O bit 23 and Interrupt Line 7

DATA23/INT7

DescriptionNameBit

Table 5-4. Data Port C Control Register

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