CXD3018Q/R
(a) Auto focus ($47)
Focus search-up is performed, FOK and FZC are checked, and the focus servo is turned on.
If $47 is received from the CPU, the focus servo is turned on according to Fig. 4-3. The auto focus starts with
focus search-up, and note that the pickup should be lowered beforehand (focus search down). In addition,
blind E of register 5 is used to eliminate FZC chattering. Concretely, the focus servo is turned on at the falling
edge of FZC after FZC has been continuously high for a longer time than E.
Auto focus
Focus search up
FOK=H
NO
YES
(Check whether FZC is continuously high
for the period of time E set with register 5.)
FZC = H
NO
YES
FZC = L
NO
YES
Focus servo ON
END
Fig. 4-6-(a). Auto Focus Flow Chart
– 70 –
ETC [ ETC ]
