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AD9920ABBCZ датащи(PDF) 42 Page - Analog Devices |
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AD9920ABBCZ датащи(HTML) 42 Page - Analog Devices |
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42 / 112 page ![]() AD9920A Rev. B | Page 42 of 112 Hold Area Using the FREEZE/RESUME Registers The FREEZE/RESUME registers can also be used to create a hold area in which the V-outputs are temporarily held and later continued, starting at the point where they were held. As shown in Figure 53, the hold area function is different from the vertical masking function in that the V-outputs continue from where they stopped rather than continuing from where they would have been. The hold area temporarily stops the pixel counter for the V-outputs, whereas vertical masking allows the counter to continue in the masking area. XV1 XV8 HD NOTES 1. WHEN HOLD = 1 FOR ANY V-SEQUENCE GROUP, THE FREEZE AND RESUME REGISTERS ARE USED TO SPECIFY THE HOLD AREA. 2. IN THIS EXAMPLE, XV1 TO XV10 ARE ASSIGNED TO GROUP A. HOLD BIT FOR GROUP A = 1. 3. H-COUNTER FOR GROUP A (XV1 TO XV10) STOPS DURING HOLD AREA. XV9 HOLD AREA FOR GROUP A XV10 FREEZE RESUME Figure 53. Hold Area for Group A |
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