HP 8920A - I;O Config; Output Data; Parallel Data in; Strobe Pol

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S:\HP892XX\USRGUIDE\manual\radscrn.fb
Chapter 16, Radio Interface Screen
Field Descriptions
I/O Config
This field designates which of the 16 parallel data pins will be used as inputs. Pins
designated as inputs are pulled high internally. They can be left high for a logic 1
or pulled low for a logic 0.
Operating Considerations
A hexadecimal number that can range from 0000 to FFFF is entered in this field.
Hex 0000 designates no pins as inputs, while hex FFFF designates all 16 pins as
inputs.
To determine the number, convert the input pin’s binary weight to hexadecimal,
then add. Pin 19, D0, is the least significant bit. For example, if D0 through D7 are
to be inputs and D8 through D15 are outputs the number to enter would be 00FF.
Output Data
This field sets the data to be output on the parallel data lines.
Operating Considerations
The data is entered as a hexadecimal number that can range from 0000 to FFFF.
To determine the number, convert the binary weight of the pins that you want to
set high to hexadecimal, then add. Pin 19, D0, is the least significant bit. For
example 0008 would set pin 22, D3, high and the rest of the pins low.
The field will show the entered value but the pins don’t change until the
Send
Data
field is selected.
Parallel Data In
This field displays the value on the parallel data pins when the Parallel Data
In
field is selected. The data appears in bitwise fashion with the 16 bits organized
from MSB to LSB.
Send Data
When selected, this field clocks the data in the Output Data field to the parallel
data pins. It also outputs a pulse on the Strobe pin.
Strobe Pol
The strobe polarity field sets the polarity of the pulse on the Strobe pin. This pulse
occurs when the
Send Data field is selected.