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OUTPUT DATA
,
ODAV
Figure 3-6. Output Handshake Timing Diagram
The high-to-low transition of ODAV alerts the external
device that data is available. It also signals the status
register that the Digital Output is busy, indicating that no
further data should be sent. After the external device pulls
ODAC low, indicating that the data is being accepted,
ODAV goes high again. When the external device allows
ODAC to go high again, indicating that all data has been
accepted, the status register is informed that the Digital
Output is ready for another transaction. The Digital
Output cannot send more data to the external device until
after ODAC is allowed to go high again by the external
device.
3-16
Manual Instrument Control
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