參數(shù)資料
型號: M37281MKH-XXXSP
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
中文描述: 單芯片8位CMOS微機隱蔽字幕解碼器和屏幕顯示控制器
文件頁數(shù): 77/172頁
文件大?。?/td> 1319K
代理商: M37281MKH-XXXSP
Rev.1.01 2003.07.16 page 77 of 170
M37281MAH
XXXSP,M37281MFH
XXXSP,M37281MKH
XXXSP, M37281EKSP
Note :
1T
C
(T
C
: 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 1T
C
regardless of character sizes, however, the
gap is 1.5T
C
only when the character size is 1.5T
C
.
Fig. 8.11.12 Notes on Horizontal Display Start Position
H
SYNC
1T
C
1T
C
Block 1 (Pre-divide ratio = 1)
1T
C
4T
OSC
N
Note 1
Block 2 (Pre-divide ratio = 2)
Block 3 (Pre-divide ratio = 3)
Block 4 (Pre-divide ratio = 2, character size = 1.5Tc)
1.5T
C
: Value of horizontal position register (decimal notation)
: OSD clock cycle divided in pre-divide circuit
: OSD oscillation cycle
: 50 Tosc
N
Tc
Tosc
Tdef
T
def
The horizontal display position is common to all blocks, and can be
set in 256 steps (where 1 step is 4T
OSC
, T
OSC
being the oscillating
cycle for display) as values
00
16
to
FF
16
in bits 0 to 7 of the hori-
zontal position register (address 00CF
16
). The horizontal position reg-
ister is shown in Figure 8.11.12.
Fig. 8.11.11 Horizontal Position Register
b7b6b5b4b3b2b1b0
Horizontal position register (HP) [Address 00CF
16
]
B
0
to
7
Name
Functions
After reset
R W
0
Horizontal Position Register
Control bits of horizontal
display start positions
(HP0 to HP7)
Horizontal display start positions
4T
OSC
(setting value of high-order 4 bits
16
1
+setting value of low-order 4 bits
16
0
)
R W
Notes 1.
The setting value synchronizes with the V
SYNC
.
2.
T
OSC
= OSD oscillation period.
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