
MITSUBISHI MICROCOMPUTERS
M37271MF-XXXSP
M37271EF-XXXSP, M37271EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
49
Fig. 51. Block diagram of OSD control circuit
Display
oscillation
circuit
OSC1 OSC2
H
SYNC
V
SYNC
RAM for OSD
20-bit ✕ 40 ✕16
Data bus
RAM for OSD
(16-bit✕20✕320) +
16-bit✕26✕32)
Shift register 2
16-bit
Shift register 1
16-bit
Data slicer clock
Clock for OSD
Output circuit
R G B I1 I2
OSD Control circuit
OUT1 OUT2
Control registers for OSD
(address 00CE
16
)
(address 00CF
16
)
(addresses 00D0
16
to 00DF
16
)
(address 0216
16
)
(address 0217
16
)
(address 0218
16
)
(address 0219
16
)
(address 021B
16
)
(addresses 021C
16
to 021F
16
)
(addresses 0220
16
to 023F
16
)
OSD control register
Horizontal position register
Block control registers
Clock source control register
I/O polarity control register
Raster color register
Extra font color register
Border color register
Window H/L registers
Vertical registers
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