MITSUBISHI MICROCOMPUTERS
M37274EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
Main clock
Clock for OSD
XIN
XOUT
OSC1 OSC2
HSYNC VSYNC
Display
oscillation
circuit
Oscillation circuit
Data slicer clock
Control registers for OSD
(address 00CE16)
OSD Control circuit
OSD control register
(address 00CF16)
Horizontal position register
(addresses 00D016 to 00DF16)
(address 021616)
(address 021716)
(address 021816)
(address 021916)
(address 021B16)
(addresses 021C16 to 021F16)
(addresses 022016 to 023F16)
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 position registers
RAM for OSD
20 bytes ✕40 characters ✕16 lines
ROM for OSD
(16 dots✕20 dots✕256 characters) +
16 dots✕26 dots✕16 characters)
Shift register 1
16-bit
Output circuit
Shift register 2
16-bit
R
G
B
OUT1 OUT2
Data bus
Fig. 63. Block Diagram of OSD Circuit
66
RENESAS [ RENESAS TECHNOLOGY CORP ]
