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參數(shù)資料
| 型號： | M37271EF-XXXSP |
| 廠商： | Mitsubishi Electric Corporation |
| 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)： | 53/97頁 |
| 文件大?。?/td> | 1436K |
| 代理商： | M37271EF-XXXSP |
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MITSUBISHI MICROCOMPUTERS
M37271MF-XXXSP
M37271EF-XXXSP, M37271EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
53
The display position in the vertical direction is determined by count-
ing the horizontal sync signal (H
SYNC
). At this time, it starts to count
the rising edge (falling edge) of H
SYNC
signal from after about 1 ma-
chine cycle of rising edge (falling edge) of V
SYNC
signal. So interval
from rising edge (falling edge) of V
SYNC
signal to rising edge (falling
edge) of H
SYNC
signal needs enough time (2 machine cycles or more)
for avoiding jitter. The polarity of H
SYNC
and V
SYNC
signals can se-
lect with the I/O polarity control register (address 0217
16
). For de-
tails, refer to (15) OSD Output Pin Control.
Note:
When bits 0 and 1 of the I/O polarity control register (address
0217
16
) are set to “1” (negative polarity), the vertical position
is determined by counting falling edge of H
SYNC
signal after
rising edge of V
SYNC
control signal in the microcomputer (re-
fer to Figure 57).
Fig. 57. Supplement explanation for display position
The vertical position for each block can be set in 1024 steps (where
each step is 1T
H
(T
H
: H
SYNC
cycle)) as values “00
16
” to “FF
16
” in
vertical position register 1i (i = 1 to 16) (addresses 0220
16
to 022F
16
)
and values “00
16
” to “FF
16
” in the vertical position register 2i (i = 1 to
16) (addresses 0230
16
to 023F
16
). The structure of the vertical posi-
tion registers is shown in Figure 58.
Fig. 58. Structure of vertical position registers
The horizontal position is common to all blocks, and can be set in
256 steps (where 1 step is 4T
C
, T
C
being the oscillating cycle for
display) as values “00
16
” to “FF
16
” in bits 0 to 7 of the horizontal
position register (address 00CF
16
). The structure of the horizontal
position register is shown in Figure 59.
Fig. 59. Structure of horizontal position register
When bits 0 and 1 of the I/O polarity control register
(address 0217
16
) are set to “1” (negative polarity)
V
SYNC
signal input
V
control
signal in
microcomputer
Period of counting
H
SYNC
signal
0.25 to 0.50 [
μ
s]
( at f(X
IN
) = 8MHz)
(Note 1)
H
signal input
Not count
1
2
3
4
5
Notes 1 : Do not generate falling edge of H
SYNC
signal near rising edge of
V
SYNC
control signal in microcomputer to avoid jitter.
2 : The pulse width of V
SYNC
and H
SYNC
needs 8 machine cycles or
more.
7
0
Vertical position register 1i
(i = 1 to 16)
(VP1i : addresses 0220
16
to 022F
16
)
Control bits of vertical display
start positions (Note)
Vertical display start positions (low-order 8 bits)
T
H
(setting value of low-order 2 bits of VP2i
16
+
setting value of low-order 4 bits of VP1i
16
+
setting value of low-order 4 bits of VP1i
16 )
Note :
Set values except “00
16
” and “01
16
” to VP1i when VP2i is “00
16.
”
2
1
0
7
0
Vertical position register 2i
(i = 1 to 16)
(VP2i : addresses 0230
16
to 023F
16
)
Control bits of vertical display
start positions (Note)
Vertical display start positions (high-order 2 bits)
T
H
(setting value of low-order 2 bits of VP2i
16
+
setting value of low-order 4 bits of VP1i
16
+
setting value of low-order 4 bits of VP1i
16 )
2
1
0
Note
:
The setting value synchronizes with a rising (falling) of the V
SYNC
.
7
0
Horizontal position register
(HP : address 00CF
16
)
Control bits of horizontal display
start positions
Horizontal display start positions
4T
OSC
(setting value of high-order 4 bits
16
+
setting value of low-order 4 bits
16 )
1
0
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