AD9920ABBCZ datasheet(42/112 Pages) AD

Nome de Peças	AD9920ABBCZ

Descrição Electrónicos	12-Bit CCD Signal Processor with V-Driver and Precision Timing Generator

PDF	112 Pages

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Fabricante Electrônico	AD [Analog Devices]

Página de início	http://www.analog.com

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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

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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