M37280MF Datasheet, PDF (77/178 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

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MITSUBISHI MICROCOMPUTERS
M37280MF–XXXSP, M37280MK–XXXSP
M37280EKSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
The horizontal position is common to all blocks, and can be set in
256 steps (where 1 step is 4TOSC, TOSC being the oscillating cycle
for display) as values “0016” to “FF16” in bits 0 to 7 of the horizontal
position register (address 00CF16). The horizontal position register
is shown in Figure 12.11.12.
Horizontal Position Register
b7 b6 b5 b4 b3 b2 b1 b0
Horizontal position register (HP) [Address 00CF16]
B
Name
Functions
After reset R W
0 Control bits of horizontal ^{Horizontal display start positions}
to ^{display start positions}
7 ^{(HP0 to HP7)}
4TOSC !
(setting value of high-order 4 bits ! 16¹
+setting value of low-order 4 bits ! 16⁰ )
0 RW
Notes 1. The setting value synchronizes with the VSYNC.
2. TOSC = OSD oscillation period.
Fig. 12.11.12 Horizontal Position Register
Note : 1TC (TC : OSD clock cycle divided in pre-divide circuit) gap occurs be-
tween the horizontal display start position set by the horizontal position
register and the most left dot of the 1st block. Accordingly, when 2 blocks
have different pre-divide ratios, their horizontal display start position
will not match.
Ordinaly, this gap is 1TC regardless of character sizes, however, the
gap is 1.5TC only when the character size is 1.5TC.
HSYNC
Note 1 ^Tdef
1TC
4TOSC ! N ^1TC
1TC
1.5TC
Block 1 (Pre-divide ratio = 1)
Block 2 (Pre-divide ratio = 2)
Block 3 (Pre-divide ratio = 3)
Block 4 (Pre-divide ratio = 2, character size = 1.5Tc)
N : Value of horizontal position register (decimal notation)
Tc : OSD clock cycle divided in pre-divide circuit
Tosc : OSD oscillation cycle
Tdef : 50 Tosc
Fig. 12.11.13 Notes on Horizontal Display Start Position
Rev. 1.0
77