Digital Control Circuit; Digital Control Unit - NEC MultiSync 3D JC-1404HME Service Manual

(2-5) Digital Control Circuit
(2-5-1) Digital Control Unit
Digital Control System
l
Automatic Synchronization 1Automatic signal identification
Management of displaying proper picture Automatic Sizing
Management of user controls Automatic Centering
Management of factory Adjustment Management of Picture Data
H.SYNC
V.SYNC
USER
CONTROLS
H.PHASE
H.SIZE
V.POSITION
V.SIZE
(Fjg. 2-5-1) The BLOCK DIAGRAM of Digital Control System
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Single Chip Computer
(µPD78C11)
CPU
(8 bit)
ROM
Progran
Memory
RAM
Buffer
and
Working
Memory
-59-
1/0
D/A Converter
(µPD6336C)
DAC1 H-F /V OUT
DAC2 V-F/V OUT
DAC3 H.PHASE CONTROL
DAC4 H.SIZE CONTROL
DAC5 V. POSITION CONTROL
DAC6 V.SIZE CONTROL
EE PROM (ER-5911)
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