Wait for the D/A to Update
Writing the MSB and channel number to Base+7 starts the D/A update process for the selected channel. The update
process requires approximately 30 microseconds to transmit the data serially to the D/A chip and update the D/A
circuit in the chip. During this period, no attempt should be made to write to any other channel in the D/A through
addresses Base+6 or Base+7.
The status bit DACBUSY (Base+3, bit 4) indicates if the D/A is busy updating (1) or idle (0). After writing to the
D/A, monitor DACBUSY until it is zero before continuing with the next D/A operation.
Diamond Systems Corporation
Athena II User Manual
Page 81
