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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
M37150M6/M8/MA/MC/MF-XXXFP, M37150EFFP
69
Rev. 1.0
The horizontal display start position is common to all blocks, and can
be set in 128 steps (where 1 step is 4TOSC, TOSC being the OSD
oscillation cycle) as values “0016” to “FF16” in bits 0 to 6 of the hori-
zontal position register (address 00D116). The horizontal position reg-
ister is shown in Figure 8.11.8.
Fig. 8.11.8 Horizontal Position Register
Notes 1 : 1TC (TC : OSD clock cycle divided in pre-divide circuit) gap occurs
between 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 dis-
play start position will not match.
2 : The horizontal start position is based on the OSD clock source cycle
selected for each block. Accordingly, when 2 blocks have different
OSD clock source cycles, their horizontal display start position will
not match.
3 : When setting “0016” to the horizontal position register, it needs an
approximately 62TOSC (= Tdef) interval from a rising edge (when nega-
tive polarity is selected) of HSYNC signal to the horizontal display start
position.
Fig. 8.11.9 Notes on Horizontal Display Start Position
4TOSC’ N
4TOSC N
HSYNC
1TC
Note 1
Note 2
Block 2 (Pre-divide ratio = 2, clock source = data slicer clock)
Block 3 (Pre-divide ratio = 3, clock source = data slicer clock)
Block 4 (Pre-divide ratio = 3, clock source = OSC1)
Tdef
Tdef’
N
: Value of horizontal position register (decimal notation)
1TC : OSD clock cycle divided in pre-divide circuit
TOSC : OSD oscillation cycle
Tdef
: 62 TOSC
b7 b6 b5 b4 b3 b2 b1 b0
Horizontal position register (HP) [Address 00D116]
B
Name
Horizontal Position Register
7
Horizontal display start
position control bits
(HP0 to HP6)
Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is “0.”
Functions
After reset R W
Horizontal display start position
4Tosc n
(n: setting value, Tosc: OSD oscillation cycle)
0
RW
R —
0
to
6
Note: The setting value synchronizes with the V SYNC.