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System 3 5-7
RM1/RM2 Mobile Processors
Note: The digital lines drive about 25 milliamps.
Configuring the Programmable I/O Lines
All 8 digital lines are independently configurable as inputs or outputs. By default, bits
0-3 are configured as inputs and bits 4-7 are configured as outputs. In RPvdsEx,
bits 0-7 in the bit configuration register control the configuration of the eight
addressable bits as inputs or outputs. Setting a bit to one will configure that bit as
an output.
To access the bit configuration register:
1. Click the Device Setup command on the Implement menu.
2. In the Set Hardware Parameters dialog box, click the Type drop-down
box and select RM1 or RM2 from the list.
The dialog expands to display the Device Configuration .
3. Click Modify to display the Edit Bit Dir Control dialog box.
In this dialog box, a series of check boxes are used to create a bitmask
that is used to program all bits.
4. To enable the check boxes, delete Und from the Decimal Value box.
5. To determine the desired value, select or clear the check boxes. By default,
all check boxes are cleared (value = 0). Click the check boxes for desired
bits (0 -7) to set the bit to one and configure that bit as an output.