Datasheet

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SBAS124C − DECEMBER 1999 − REVISED DECEMBER 2005
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26
Digital I/O Control Register
The Digital I/O Control register (ADDR = 6) contains the information that determines whether each of the four
digital I/O lines is configured as an input or output. Setting the appropriate OE bit to 1 enables the corresponding
I/O pin as an output. Setting the appropriate OE bit to 0 enables the corresponding I/O pin as an input (see
Figure 27).
DIGITAL I/O CONTROL REGISTER
ADDR D7 (MSB) D6 D5 D4 D3 D2 D1 D0
6 0 0 0 0 OE3 OE2 OE1 OE0
ADDR = 6
BIT SYMBOL NAME VALUE FUNCTION
D7−D4 — — 0 These bits are reserved and must always be set to 0.
D3 OE3 State for I/O3 0
1
Digital I/O 1 − digital input
Digital I/O 1 = digital output
D2 OE2 State for I/O2 0
1
Digital I/O 2− digital input
Digital I/O 2 − digital output
D1 OE1 State for I/O1 0
1
Digital I/O 3− digital input
Digital I/O 3 − digital output
D0 OE0 State for I/O0 0
1
Digital I/O 4− digital input
Digital I/O 4 − digital output
Bold items are power-up default conditions.
Figure 27. Digital I/O Control Register (ADDR = 6)