cxd2548r Sony Electronics, cxd2548r Datasheet - Page 61

• Manufacturer Part Number: cxd2548r
• Description: Cd Digital Signal Processor With Built-in Digital Servo And Dac
• Manufacturer: Sony Electronics

(a) Auto focus ($47)
CXD2548R connection diagram when using auto sequence (example)
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. 3-4. 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.
RF
FOK
Fig. 3-4-(a). Auto Focus Flow Chart
FOK
Focus search up
Focus servo ON
CXD2548R
Fig. 3-3
Auto focus
FZC = H
FZC = L
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FOK=H
END
YES
YES
YES
DATA
CLOK
SENS
XLAT
NO
NO
NO
(Check whether FZC is continuously high
for the period of time E set with register 5.)
Micro-computer
CXD2548R