cxd2589q Sony Electronics, cxd2589q Datasheet - Page 46

• Manufacturer Part Number: cxd2589q
• Description: Cd Digital Signal Processor
• Manufacturer: Sony Electronics

(a) Auto Focus ($47)
Connection diagram for using auto sequencer (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. 4-3. The auto focus starts
with focus search-up, and the pickup should be lowered beforehand (focus search-down). In addition, blind
E of register 5 is used to eliminate FZC chattering. In other words, the focus servo is turned on at the falling
edge of FZC after FZC has been continuously high for a longer time than E.
SSP
RF
SENS
C. out
DATA
FOK
CLK
XLT
Fig. 4-3-(a). Auto Focus Flow Chart
Focus search up
CNIN
SEIN
DATO
CLKO
XLTO
Focus servo ON
FOK
Auto focus
Fig. 4-2.
FOK = H
FZC = H
FZC = L
CXD2589Q
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END
YES
YES
YES
NO
NO
NO
DATA
CLOK
SENS
XLAT
(Checks whether FZC is continuously high
for the period of time E set with register 5)
Micro-computer
CXD2589Q