Hardware Manual - RTD Embedded Technologies, Inc.

BA + 0x418h (1048): Digital I/O Port 2, Bit Programmable Port
(Read/Write)
8-bit Operation.
Port 2:
D7 D6 D5 D4 D3 D2 D1 D0
P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0
This port transfers the 8-bit Port 2 bit programmable digital input/output data between the module and
external devices. The bits are individually programmed as input or output by writing to the Direction Register at
BA + 0x41Ch. For all bits set as inputs, a read reads the input values and a write is ignored. For all bits set as
outputs, a read reads the last value sent out on the line and a write writes the current loaded value out to the line.
Note that when any reset of the digital circuitry is performed (clear chip or computer reset), all digital lines are
reset to inputs and their corresponding output registers are cleared.
BA + 0x41Ah (1050): Digital I/O Port 3, Byte Programmable Port
(Read/Write)
8-bit Operation.
Port 3:
D7 D6 D5 D4 D3 D2 D1 D0
P3.7 P3.6 P3.5 P3.4 P3.3 P3.2 P3.1 P3.0
This port transfers the 8-bit Port 3 digital input or digital output byte between the module and an external
device. When Port 3 is set as inputs, a read reads the input values and a write is ignored. When Port 3 is set as
outputs, a read reads the last value sent out of the port and a write writes the current loaded value out of the
port.
Note that when any reset of the digital circuitry is performed (clear chip or computer reset), all digital lines are
reset to inputs and their corresponding output registers are cleared.
54 DM6425HR dataModule BDM-610010034 Rev C